HP A5120 EI Series Installation manual

HP A5120 EI Switch Series
Layer 3 - IP Services
Command Reference
Abstract
This document describes the commands and command syntax options available for the HP A Series
products.
This document is intended for network planners, field technical support and servicing engineers, and
network administrators who work with HP A Series products.
Part number: 5998-1794
Software version: Release 2208
Document version: 5W100-20110530

Legal and notice information
© Copyright 2011 Hewlett-Packard Development Company, L.P.
No part of this documentation may be reproduced or transmitted in any form or by any means without
prior written consent of Hewlett-Packard Development Company, L.P.
The information contained herein is subject to change without notice.
HEWLETT-PACKARD COMPANY MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS
MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE. Hewlett-Packard shall not be liable for errors contained
herein or for incidental or consequential damages in connection with the furnishing, performance, or use
of this material.
The only warranties for HP products and services are set forth in the express warranty statements
accompanying such products and services. Nothing herein should be construed as constituting an
additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein.

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Contents
ARP configuration commands········································································································································· 1
arp check enable······················································································································································1
arp max-learning-num ··············································································································································1
arp static····································································································································································2
arp timer aging·························································································································································3
display arp································································································································································4
display arp ip-address ·············································································································································5
display arp timer aging ···········································································································································6
mac-address station-move········································································································································6
reset arp ····································································································································································7
Gratuitous ARP configuration commands······················································································································ 8
arp send-gratuitous-arp············································································································································8
gratuitous-arp-sending enable·································································································································8
gratuitous-arp-learning enable ································································································································9
Proxy ARP configuration commands····························································································································10
display local-proxy-arp ········································································································································· 10
display proxy-arp ·················································································································································· 10
local-proxy-arp enable·········································································································································· 11
proxy-arp enable··················································································································································· 12
IP addressing configuration commands ······················································································································13
display ip interface ··············································································································································· 13
display ip interface brief ······································································································································ 15
ip address ······························································································································································ 17
DHCP server configuration commands························································································································19
bims-server ····························································································································································· 19
bootfile-name ························································································································································· 20
dhcp enable··························································································································································· 20
dhcp server apply ip-pool ···································································································································· 21
dhcp select server global-pool ····························································································································· 21
dhcp server detect················································································································································· 22
dhcp server forbidden-ip ······································································································································ 23
dhcp server ip-pool ··············································································································································· 24
dhcp server ping packets ····································································································································· 24
dhcp server ping timeout······································································································································ 25
dhcp server relay information enable ················································································································· 26
dhcp server threshold············································································································································ 26
display dhcp server conflict·································································································································· 27
display dhcp server expired································································································································· 28
display dhcp server free-ip··································································································································· 29
display dhcp server forbidden-ip························································································································· 30
display dhcp server ip-in-use································································································································ 31
display dhcp server statistics································································································································ 32
display dhcp server tree ······································································································································· 34
dns-list ····································································································································································· 36
domain-name ························································································································································· 36
expired ··································································································································································· 37
forbidden-ip···························································································································································· 38

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gateway-list ···························································································································································· 39
nbns-list··································································································································································· 39
netbios-type···························································································································································· 40
network··································································································································································· 41
network ip range··················································································································································· 41
network mask························································································································································· 42
option······································································································································································ 43
reset dhcp server conflict······································································································································ 44
reset dhcp server ip-in-use ···································································································································· 44
reset dhcp server statistics ···································································································································· 45
static-bind client-identifier ····································································································································· 45
static-bind ip-address ············································································································································ 46
static-bind mac-address ········································································································································ 47
tftp-server domain-name········································································································································ 47
tftp-server ip-address ············································································································································· 48
vendor-class-identifier············································································································································ 49
voice-config···························································································································································· 50
DHCP relay agent configuration commands ··············································································································51
dhcp relay address-check····································································································································· 51
dhcp relay check mac-address ···························································································································· 52
dhcp relay client-detect enable···························································································································· 52
dhcp relay information circuit-id format-type······································································································ 53
dhcp relay information circuit-id string ··············································································································· 54
dhcp relay information enable····························································································································· 54
dhcp relay information format ····························································································································· 55
dhcp relay information remote-id format-type ···································································································· 56
dhcp relay information remote-id string·············································································································· 57
dhcp relay information strategy··························································································································· 57
dhcp relay release ip ············································································································································ 58
dhcp relay security static ······································································································································ 59
dhcp relay security refresh enable ······················································································································ 59
dhcp relay security tracker ··································································································································· 60
dhcp relay server-detect········································································································································ 61
dhcp relay server-group········································································································································ 61
dhcp relay server-select ········································································································································ 62
dhcp select relay ··················································································································································· 63
display dhcp relay ················································································································································ 64
display dhcp relay information···························································································································· 64
display dhcp relay security ·································································································································· 66
display dhcp relay security statistics ··················································································································· 67
display dhcp relay security tracker······················································································································ 68
display dhcp relay server-group·························································································································· 68
display dhcp relay statistics ································································································································· 69
reset dhcp relay statistics······································································································································ 71
DHCP client configuration commands·························································································································72
display dhcp client ················································································································································ 72
ip address dhcp-alloc············································································································································ 74
DHCP snooping configuration commands ··················································································································76
dhcp-snooping ······················································································································································· 76
dhcp-snooping binding database filename········································································································ 76
dhcp-snooping binding database update interval····························································································· 77
dhcp-snooping binding database update now ·································································································· 78
dhcp-snooping check mac-address······················································································································ 78

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dhcp-snooping check request-message··············································································································· 79
dhcp-snooping information circuit-id format-type······························································································· 80
dhcp-snooping information circuit-id string········································································································· 80
dhcp-snooping information enable······················································································································ 81
dhcp-snooping information format ······················································································································ 82
dhcp-snooping information remote-id format-type ····························································································· 83
dhcp-snooping information remote-id string ······································································································· 83
dhcp-snooping information strategy···················································································································· 84
dhcp-snooping rate-limit········································································································································ 85
dhcp-snooping trust ··············································································································································· 85
display dhcp-snooping·········································································································································· 86
display dhcp-snooping binding database ·········································································································· 87
display dhcp-snooping information····················································································································· 88
display dhcp-snooping packet statistics·············································································································· 89
display dhcp-snooping trust·································································································································· 90
reset dhcp-snooping·············································································································································· 91
reset dhcp-snooping packet statistics ·················································································································· 91
BOOTP client configuration commands ······················································································································93
display bootp client··············································································································································· 93
ip address bootp-alloc ·········································································································································· 94
IPv4 DNS configuration commands·····························································································································95
display dns domain··············································································································································· 95
display dns host····················································································································································· 96
display dns server ················································································································································· 97
display ip host ······················································································································································· 98
dns domain ···························································································································································· 99
dns proxy enable ·················································································································································· 99
dns resolve ···························································································································································100
dns server·····························································································································································101
dns spoofing ························································································································································101
ip host···································································································································································102
reset dns host ·······················································································································································103
IPv6 DNS configuration commands·························································································································· 104
display dns ipv6 server·······································································································································104
display ipv6 host ·················································································································································105
dns server ipv6 ····················································································································································106
ipv6 host·······························································································································································106
IP performance optimization configuration commands ·························································································· 108
display fib ····························································································································································108
display fib ip-address··········································································································································110
display icmp statistics ·········································································································································111
display ip socket··················································································································································112
display ip statistics ··············································································································································115
display tcp statistics·············································································································································117
display udp statistics ···········································································································································119
ip forward-broadcast (interface view)···············································································································120
ip forward-broadcast (system view)···················································································································121
ip redirects enable ··············································································································································122
ip ttl-expires enable·············································································································································122
ip unreachables enable ······································································································································123
reset ip statistics···················································································································································123
reset tcp statistics·················································································································································124
reset udp statistics ···············································································································································124

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tcp timer fin-timeout ·············································································································································125
tcp timer syn-timeout············································································································································125
tcp window ··························································································································································126
IRDP configuration commands··································································································································· 127
ip irdp···································································································································································127
ip irdp address ····················································································································································127
ip irdp lifetime ·····················································································································································128
ip irdp maxadvinterval ·······································································································································128
ip irdp minadvinterval·········································································································································129
ip irdp multicast···················································································································································130
ip irdp preference ···············································································································································130
UDP Helper configuration commands ······················································································································ 132
display udp-helper server ···································································································································132
reset udp-helper packet ······································································································································132
udp-helper enable ···············································································································································133
udp-helper port ····················································································································································133
udp-helper server·················································································································································134
IPv6 basics configuration commands ······················································································································· 136
display ipv6 fib····················································································································································136
display ipv6 interface ·········································································································································137
display ipv6 nd snooping···································································································································141
display ipv6 neighbors·······································································································································142
display ipv6 neighbors count·····························································································································144
display ipv6 pathmtu ··········································································································································145
display ipv6 socket ·············································································································································146
display ipv6 statistics ··········································································································································148
display tcp ipv6 statistics····································································································································151
display tcp ipv6 status ········································································································································154
display udp ipv6 statistics ··································································································································155
ipv6·······································································································································································156
ipv6 address ························································································································································157
ipv6 address anycast··········································································································································157
ipv6 address auto ···············································································································································158
ipv6 address auto link-local ·······························································································································159
ipv6 address eui-64 ············································································································································160
ipv6 address link-local········································································································································160
ipv6 hoplimit-expires enable······························································································································161
ipv6 icmp-error ····················································································································································162
ipv6 icmpv6 multicast-echo-reply enable··········································································································162
ipv6 nd autoconfig managed-address-flag·······································································································163
ipv6 nd autoconfig other-flag·····························································································································163
ipv6 nd dad attempts··········································································································································164
ipv6 nd hop-limit··················································································································································164
ipv6 nd ns retrans-timer ······································································································································165
ipv6 nd nud reachable-time ·······························································································································166
ipv6 nd proxy enable ·········································································································································166
ipv6 nd ra halt·····················································································································································167
ipv6 nd ra interval···············································································································································167
ipv6 nd ra no-advlinkmtu····································································································································168
ipv6 nd ra prefix ·················································································································································169
ipv6 nd ra router-lifetime ····································································································································170
ipv6 nd snooping enable ···································································································································170
ipv6 nd snooping max-learning-num·················································································································171

vii
ipv6 neighbor ······················································································································································171
ipv6 neighbors max-learning-num ·····················································································································172
ipv6 neighbor stale-aging ··································································································································173
ipv6 pathmtu························································································································································173
ipv6 pathmtu age················································································································································174
ipv6 prefer temporary-address ··························································································································175
ipv6 unreachables enable··································································································································175
reset ipv6 nd snooping·······································································································································176
reset ipv6 neighbors ···········································································································································176
reset ipv6 pathmtu···············································································································································177
reset ipv6 statistics ··············································································································································178
reset tcp ipv6 statistics ········································································································································178
reset udp ipv6 statistics·······································································································································179
tcp ipv6 timer fin-timeout ····································································································································179
tcp ipv6 timer syn-timeout···································································································································180
tcp ipv6 window··················································································································································180
DHCPv6 configuration commands···························································································································· 182
DHCPv6 common configuration commands ·············································································································182
display ipv6 dhcp duid·······································································································································182
DHCPv6 server configuration commands··················································································································182
display ipv6 dhcp pool·······································································································································182
display ipv6 dhcp prefix-pool····························································································································184
display ipv6 dhcp server ····································································································································185
display ipv6 dhcp server pd-in-use····················································································································186
display ipv6 dhcp server statistics·····················································································································188
dns-server ·····························································································································································190
domain-name ·······················································································································································191
ipv6 dhcp pool ····················································································································································191
ipv6 dhcp prefix-pool··········································································································································192
ipv6 dhcp server apply pool······························································································································193
ipv6 dhcp server enable·····································································································································194
prefix-pool ····························································································································································194
reset ipv6 dhcp server pd-in-use ························································································································195
reset ipv6 dhcp server statistics ·························································································································196
sip-server ······························································································································································196
static-bind prefix ··················································································································································197
DHCPv6 relay agent configuration commands ········································································································198
display ipv6 dhcp relay server-address ············································································································198
display ipv6 dhcp relay statistics·······················································································································199
ipv6 dhcp relay server-address··························································································································201
reset ipv6 dhcp relay statistics···························································································································202
DHCPv6 client configuration commands···················································································································202
display ipv6 dhcp client ·····································································································································202
display ipv6 dhcp client statistics ······················································································································203
reset ipv6 dhcp client statistics···························································································································205
DHCPv6 snooping configuration commands ············································································································205
display ipv6 dhcp snooping trust ······················································································································205
display ipv6 dhcp snooping user-binding ········································································································206
ipv6 dhcp snooping enable·······························································································································207
ipv6 dhcp snooping max-learning-num·············································································································208
ipv6 dhcp snooping trust····································································································································208
ipv6 dhcp snooping vlan enable·······················································································································209
reset ipv6 dhcp snooping user-binding·············································································································209

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Contacting HP ······························································································································································211
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Index············································································································································································· 214

1
ARP configuration commands
arp check enable
Syntax
arp check enable
undo arp check enable
View
System view
Default level
2: System level
Parameters
None
Description
Use the arp check enable command to enable dynamic ARP entry check.
Use the undo arp check enable command to disable dynamic ARP entry check.
By default, dynamic ARP entry check is enabled.
Examples
# Enable ARP entry check.
<Sysname> system-view
[Sysname] arp check enable
arp max-learning-num
Syntax
arp max-learning-num number
undo arp max-learning-num
View
Ethernet interface view, VLAN interface view, Layer 2 aggregate interface view
Default level
2: System level
Parameters
number: Specifies the maximum number of dynamic ARP entries that an interface can learn, in the range
0 to 1024.
Description
Use the arp max-learning-num command to configure the maximum number of dynamic ARP entries that
an interface can learn.

2
Use the undo arp max-learning-num command to restore the default.
By default, the maximum number of dynamic ARP entries that an interface can learn is 1024.
When the number argument is set to 0, the interface is disabled from learning dynamic ARP entries.
Examples
# Specify VLAN-interface 40 to learn up to 500 dynamic ARP entries.
<Sysname> system-view
[Sysname] interface vlan-interface 40
[Sysname-Vlan-interface40] arp max-learning-num 500
# Specify GigabitEthernet 1/0/1 to learn up to 1000 dynamic ARP entries.
<Sysname> system-view
[Sysname] interface GigabitEthernet 1/0/1
[Sysname-GigabitEthernet1/0/1] arp max-learning-num 1000
# Specify Layer 2 aggregate interface bridge-aggregation 1 to learn up to 1000 dynamic ARP entries.
<Sysname> system-view
[Sysname] interface bridge-aggregation 1
[Sysname-Bridge-Aggregation1] arp max-learning-num 1000
arp static
Syntax
arp static ip-address mac-address [ vlan-id interface-type interface-number ]
undo arp static ip-address
undo arp ip-address
View
System view
Default level
2: System level
Parameters
ip-address: Specifies the IP address in an ARP entry.
mac-address: Specifies the MAC address in an ARP entry, in the format H-H-H.
vlan-id: Specifies the ID of a VLAN to which a static ARP entry belongs, in the range 1 to 4094.
interface-type interface-number: Specifies the interface type and interface number.
Description
Use the arp static command to configure a static ARP entry in the ARP mapping table.
Use the undo arp command to remove an ARP entry.

3
NOTE:
A static ARP entry is effective when the switch works normally. However, when the VLAN or VLAN interface to
which an ARP entry corresponds is deleted, the entry, if long, will be deleted, and if short and resolved, will
become unresolved.
The vlan-id argument specifies the VLAN corresponding to an ARP entry and must be the ID of an existing
VLAN. In addition, the Ethernet interface following the argument must belong to that VLAN. The VLAN interface
of the VLAN must have been created.
If both the vlan-id and ip-address arguments are specified, the IP address of the VLAN interface corresponding
to the vlan-id argument must belong to the same network segment as the IP address specified by the ip-address
argument.
Related commands: reset arp and display arp.
Examples
# Configure a static ARP entry, with the IP address being 202.38.10.2, the MAC address being 00e0-
fc01-0000, and the outbound interface being GigabitEthernet 1/0/1 of VLAN 10.
<Sysname> system-view
[Sysname] arp static 202.38.10.2 00e0-fc01-0000 10 GigabitEthernet 1/0/1
arp timer aging
Syntax
arp timer aging aging-time
undo arp timer aging
View
System view
Default level
2: System level
Parameters
aging-time: Specifies the age timer for dynamic ARP entries in minutes, in the range 1 to 1440.
Description
Use the arp timer aging command to set the age timer for dynamic ARP entries.
Use the undo arp timer aging command to restore the default.
By default, the age timer for dynamic ARP entries is 20 minutes.
Related commands: display arp timer aging.
Examples
# Set the age timer for dynamic ARP entries to 10 minutes.
<Sysname> system-view
[Sysname] arp timer aging 10

4
display arp
Syntax
display arp [ [ all | dynamic | static ] [ slot slot-number ] | vlan vlan-id | interface interface-type
interface-number ] [ count ] [ |{ begin | exclude | include } regular-expression ]
View
Any view
Default level
1: Monitor level
Parameters
all: Displays all ARP entries.
dynamic: Displays dynamic ARP entries.
static: Displays static ARP entries.
slot slot-number: Displays the ARP entries of the specified device. If the device is in an IRF, the slot-number
argument represents the member ID of the device; if the device is not in any IRF, the slot-number argument
represents the current device ID.
If the switch does not support IRF, the slot-number argument must be 1.
vlan vlan-id: Displays the ARP entries of the specified VLAN. The VLAN ID ranges from 1 to 4094.
interface interface-type interface-number: Displays the ARP entries of the interface specified by the
argument interface-type interface-number.
count: Displays the number of ARP entries.
|: Filters command output by specifying a regular expression. For more information about regular
expressions, see the Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression..
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Description
Use the display arp command to display ARP entries in the ARP mapping table.
If no parameter is specified, all ARP entries are displayed.
Related commands: arp static and reset arp.
Examples
# Display the detailed information of all ARP entries.
<Sysname> display arp all
Type: S-Static D-Dynamic
IP Address MAC Address VLAN ID Interface Aging Type
192.168.0.254 00e0-fc00-5112 1 GE1/0/19 17 D
192.168.0.235 00e0-fc02-2181 1 GE1/0/19 20 D
192.168.0.74 0023-895f-9550 1 GE1/0/19 19 D
192.168.0.3 000d-88f8-4e71 1 GE1/0/19 10 D

5
Table 1 Output description
Field
Description
IP Address
IP address in an ARP entry
MAC Address
MAC address in an ARP entry
VLAN ID
VLAN ID contained in a static ARP entry
Interface
Outbound interface in an ARP entry
Aging
Aging time for a dynamic ARP entry in minutes ("DIS" or ―N/A‖ means
unknown aging time or no aging time)
Type
ARP entry type: D for dynamic, S for static
# Display the number of all ARP entries.
<Sysname> display arp all count
Total Entry(ies): 4
display arp ip-address
Syntax
display arp ip-address [ slot slot-number ] [ | { begin | exclude | include } regular-expression ]
View
Any view
Default level
1: Monitor level
Parameters
ip-address: Displays the ARP entry for the specified IP address.
slot slot-number: Displays the ARP entries of the specified device. The slot-number argument is the member
number of the device in the IRF, which you can display with the display irf command. The value range for
the slot-number argument depends on the number of members and numbering conditions in the current
IRF. If no IRF exists, the slot-number argument is the current device number.
If the switch does not support IRF, the slot-number argument must be 1.
|: Filters command output by specifying a regular expression. For more information about regular
expressions, see the Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Description
Use the display arp ip-address command to display the ARP entry for a specified IP address.
Related commands: arp static and reset arp.

6
Examples
# Display the corresponding ARP entry for the IP address 20.1.1.1.
<Sysname> display arp 20.1.1.1
Type: S-Static D-Dynamic
IP Address MAC Address VLAN ID Interface Aging Type
20.1.1.1 00e0-fc00-0001 N/A N/A N/A S
display arp timer aging
Syntax
display arp timer aging [ |{ begin | exclude | include } regular-expression ]
View
Any view
Default level
2: System level
Parameters
|: Filters command output by specifying a regular expression. For more information about regular
expressions, see the Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Description
Use the display arp timer aging command to display the age timer for dynamic ARP entries.
Related commands: arp timer aging.
Examples
# Display the age timer for dynamic ARP entries.
<Sysname> display arp timer aging
Current ARP aging time is 10 minute(s)
mac-address station-move
Syntax
mac-address station-move quick-notify enable
undo mac-address station-move quick-notify enable
View
System view
Default level
2: System level

7
Parameters
None
Description
Use the mac-address station-move quick-notify enable command to enable ARP quick update.
Use the undo mac-address station-move quick-notify enable command to restore the default.
By default, ARP quick update is disabled.
Example
# Enable ARP quick update.
<Sysname> system-view
[Sysname] mac-address station-move quick-notify enable
reset arp
Syntax
reset arp { all | dynamic | static | slot slot-number | interface interface-type interface-number }
View
User view
Default level
2: System level
Parameters
all:Clears all ARP entries.
dynamic:Clears all dynamic ARP entries.
static: Clears all static ARP entries.
slot slot-number: Clears the ARP entries for the specified device. The slot-number argument is the member
number of the device in the IRF, which you can display with the display irf command. The value range for
the slot-number argument depends on the number of members and numbering conditions in the current
IRF. If no IRF exists, the slot-number argument is the current device number.
If the switch does not support IRF, the slot-number argument must be 1.
interface interface-type interface-number:Clears the ARP entries for the interface specified by the
argument interface-type interface-number.
Description
Use the reset arp command to clear ARP entries from the ARP mapping table.
Related commands: arp static and display arp.
Examples
# Clear all static ARP entries.
<Sysname> reset arp static

8
Gratuitous ARP configuration commands
arp send-gratuitous-arp
Syntax
arp send-gratuitous-arp [ interval milliseconds ]
undo arp send-gratuitous-arp
View
VLAN interface view
Default level
2: System level
Parameters
interval milliseconds: Sets the interval at which gratuitous ARP packets are sent, in the range 200 to
200,000 milliseconds. The default value is 2000.
Description
Use the arp send-gratuitous-arp command to enable periodic sending of gratuitous ARP packets and set
the sending interval for the interface.
Use the undo arp send-gratuitous-arp command to disable the interface from periodically sending
gratuitous ARP packets.
By default, an interface is disabled from sending gratuitous ARP packets periodically.
This function takes effect only when the link of the enabled interface goes up and an IP address has been
assigned to the interface.
If you change the interval for sending gratuitous ARP packets, the configuration is effective at the next
sending interval.
The frequency of sending gratuitous ARP packets may be much lower than is expected if this function is
enabled on multiple interfaces, or each interface is configured with multiple secondary IP addresses, or a
small sending interval is configured in the preceding cases.
Examples
# Enable VLAN-interface 2 to send gratuitous ARP packets every 300 millionseconds.
<Sysname> system-view
[Sysname] interface vlan-interface 2
[Sysname-Vlan-interface2] arp send-gratuitous-arp interval 300
gratuitous-arp-sending enable
Syntax
gratuitous-arp-sending enable
undo gratuitous-arp-sending enable

9
View
System view
Default level
2: System level
Parameters
None
Description
Use the gratuitous-arp-sending enable command to enable a switch to send gratuitous ARP packets when
receiving ARP requests from another network segment.
Use the undo gratuitous-arp-sending enable command to restore the default.
By default, a switch cannot send gratuitous ARP packets when receiving ARP requests from another
network segment.
Examples
# Disable a switch from sending gratuitous ARP packets.
<Sysname> system-view
[Sysname] undo gratuitous-arp-sending enable
gratuitous-arp-learning enable
Syntax
gratuitous-arp-learning enable
undo gratuitous-arp-learning enable
View
System view
Default level
2: System level
Parameters
None
Description
Use the gratuitous-arp-learning enable command to enable the gratuitous ARP packet learning function.
Use the undo gratuitous-arp-learning enable command to disable the function.
By default, the function is enabled.
With this function enabled, a switch receiving a gratuitous ARP packet can add the source IP and MAC
addresses carried in the packet to its own dynamic ARP table if it finds that no ARP entry exists in the
cache corresponding to the source IP address of the ARP packet. If the corresponding ARP entry exists in
the cache, the switch updates the ARP entry regardless of whether this function is enabled.
Examples
# Enable the gratuitous ARP packet learning function.
<Sysname> system-view
[Sysname] gratuitous-arp-learning enable

10
Proxy ARP configuration commands
display local-proxy-arp
Syntax
display local-proxy-arp [interface interface-type interface-number ] [ |{ begin | exclude | include }
regular-expression ]
View
Any view
Default level
2: System level
Parameters
interface interface-type interface-number: Displays the local proxy ARP status of the interface specified by
the argument interface-type interface-number.
|: Filters command output by specifying a regular expression. For more information about regular
expressions, see the Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Description
Use the display local-proxy-arp command to display the status of the local proxy ARP.
If no interface is specified, the local proxy ARP status of all interfaces is displayed.
Related commands: local-proxy-arp enable.
Examples
# Display the status of the local proxy ARP on VLAN-interface 2.
<Sysname> display local-proxy-arp interface vlan-interface 2
Interface Vlan-interface2
Local Proxy ARP status: enabled
display proxy-arp
Syntax
display proxy-arp [interface interface-type interface-number ] [ |{ begin | exclude | include } regular-
expression ]
View
Any view

11
Default level
2: System level
Parameters
interface interface-type interface-number: Displays the proxy ARP status of the interface specified by the
argument interface-type interface-number.
|: Filters command output by specifying a regular expression. For more information about regular
expressions, see the Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Description
Use the display proxy-arp command to display the proxy ARP status.
If an interface is specified, the proxy ARP status of the specified interface is displayed; if no interface is
specified, the proxy ARP status of all interfaces is displayed.
Related commands: proxy-arp enable.
Examples
# Display the proxy ARP status on Vlan-interface1.
<Sysname> display proxy-arp interface Vlan-interface 1
Interface Vlan-interface1
Proxy ARP status: disabled
local-proxy-arp enable
Syntax
local-proxy-arp enable [ ip-range startIP to endIP ]
undo local-proxy-arp enable
View
VLAN interface view
Default level
2: System level
Parameters
ip-range startIP to endIP: Specifies the IP address range for which local proxy ARP is enabled. The start IP
address must be lower than or equal to the end IP address.
Description
Use the local-proxy-arp enable command to enable local proxy ARP.
Use the undo local-proxy-arp enable command to disable local proxy ARP.
By default, local proxy ARP is disabled.
Only one IP address range can be specified by using the ip-range keyword on an interface.

12
Related commands: display local-proxy-arp.
Examples
# Enable local proxy ARP on VLAN-interface 2.
<Sysname> system-view
[Sysname] interface vlan-interface 2
[Sysname-Vlan-interface2] local-proxy-arp enable
# Enable local proxy ARP on VLAN-interface 2 for a specific IP address range.
<Sysname> system-view
[Sysname] interface vlan-interface 2
[Sysname-Vlan-interface2] local-proxy-arp enable ip-range 1.1.1.1 to 1.1.1.20
proxy-arp enable
Syntax
proxy-arp enable
undo proxy-arp enable
View
VLAN interface view
Default level
2: System level
Parameters
None
Description
Use the proxy-arp enable command to enable proxy ARP.
Use the undo proxy-arp enable command to disable proxy ARP.
By default, proxy ARP is disabled.
Related commands: display proxy-arp.
Examples
# Enable proxy ARP on VLAN-interface 2.
<Sysname> system-view
[Sysname] interface vlan-interface 2
[Sysname-Vlan-interface2] proxy-arp enable