H3C S12500 Series User manual

H3C S12500 Series Routing Switches
Interface Command Reference
Hangzhou H3C Technologies Co., Ltd.
http://www.h3c.com
Software version: S12500-CMW710-R7128
Document version: 6W710-20121130

Copyright © 2012, Hangzhou H3C Technologies Co., Ltd. and its licensors
All rights reserved
No part of this manual may be reproduced or transmitted in any form or by any means without prior
written consent of Hangzhou H3C Technologies Co., Ltd.
Trademarks
H3C, , Aolynk, , H3Care, , TOP G, , IRF, NetPilot, Neocean, NeoVTL,
SecPro, SecPoint, SecEngine, SecPath, Comware, Secware, Storware, NQA, VVG, V2G, VnG, PSPT,
XGbus, N-Bus, TiGem, InnoVision and HUASAN are trademarks of Hangzhou H3C Technologies Co.,
Ltd.
All other trademarks that may be mentioned in this manual are the property of their respective owners
Notice
The information in this document is subject to change without notice. Every effort has been made in the
preparation of this document to ensure accuracy of the contents, but all statements, information, and
recommendations in this document do not constitute the warranty of any kind, express or implied.

Preface
The H3C S12500 documentation set includes 13 command references, which describe the commands
and command syntax options available for the H3C S12500 Series Routing Switches.
The Interface Command Reference describes Ethernet, loopback, and null interface configuration
commands.
This preface includes:
•Audience
•Conventions
•About the H3C S12500 documentation set
•Obtaining documentation
•Technical support
•Documentation feedback
Audience
This documentation is intended for:
•Network planners
•Field technical support and servicing engineers
•Network administrators working with the S12500 series
Conventions
This section describes the conventions used in this documentation set.
Command conventions
Convention Descri
p
tion
Boldface Bold text represents commands and keywords that you enter literally as shown.
Italic Italic text represents arguments that you replace with actual values.
[ ] Square brackets enclose syntax choices (keywords or arguments) that are optional.
{ x | y | ... }
Braces enclose a set of required syntax choices separated by vertical bars, from which
you select one.
[ x | y | ... ]
Square brackets enclose a set of optional syntax choices separated by vertical bars, from
which you select one or none.
{ x | y | ... } *
Asterisk marked braces enclose a set of required syntax choices separated by vertical
bars, from which you select at least one.
[ x | y | ... ] *
Asterisk marked square brackets enclose optional syntax choices separated by vertical
bars, from which you select one choice, multiple choices, or none.
&<1-n> The argument or keyword and argument combination before the ampersand (&) sign can
be entered 1 to n times.

Convention Descri
p
tion
# A line that starts with a pound (#) sign is comments.
GUI conventions
Convention Descri
p
tion
Boldface Window names, button names, field names, and menu items are in Boldface. For
example, the New User window appears; click OK.
> Multi-level menus are separated by angle brackets. For example, File > Create > Folder.
Symbols
Convention Descri
p
tion
WARNING An alert that calls attention to important information that if not understood or followed can
result in personal injury.
CAUTION An alert that calls attention to important information that if not understood or followed can
result in data loss, data corruption, or damage to hardware or software.
IMPORTANT An alert that calls attention to essential information.
NOTE An alert that contains additional or supplementary information.
TIP An alert that provides helpful information.
Port numbering in examples
The port numbers in this document are for illustration only and might be unavailable on your switch.
About the H3C S12500 documentation set
The H3C S12500 documentation set includes:
Cate
g
or
y
Documents Pur
p
oses
Product description and
specifications
Marketing brochures Describe product specifications and benefits.
Technology white papers
Provide an in-depth description of software features
and technologies.
Card datasheets Describe card specifications, features, and
standards.
Hardware specifications
and installation
Regulatory compliance
and safety information
Provides regulatory information and the safety
instructions that must be followed during installation.
Installation guide Provides a complete guide to hardware installation
and hardware specifications.
Quick start
Guides you through initial installation and setup
procedures to help you quickly set up and use your
switch with the minimum configuration.
H3C Pluggable SFP
[SFP+][XFP] Transceiver
Modules Installation
Guide
Guides you through installing SFP/SFP+/XFP
transceiver modules.

Cate
g
or
y
Documents Pur
p
oses
Adjustable Slider Rail
Installation Guide
Guides you through installing adjustable slider rails
to a rack.
H3C High-End Network
Products Hot-Swappable
Module Manual
Describes the hot-swappable modules available for
the H3C high-end network products, their external
views, and specifications.
Software configuration
Configuration guides Describe software features and configuration
procedures.
Command references Provide a quick reference to all available
commands.
Operations and
maintenance
System log messages Explains the system log messages.
Trap messages Explains the trap messages.
MIB Companion Describes the MIBs for the software release.
Release notes
Provide information about the product release,
including the version history, hardware and software
compatibility matrix, version upgrade information,
technical support information, and software
upgrading.
Obtaining documentation
You can access the most up-to-date H3C product documentation on the World Wide Web
at http://www.h3c.com.
Click the links on the top navigation bar to obtain different categories of product documentation:
[Technical Support & Documents > Technical Documents] – Provides hardware installation, software
upgrading, and software feature configuration and maintenance documentation.
[Products & Solutions] – Provides information about products and technologies, as well as solutions.
[Technical Support & Documents > Software Download] – Provides the documentation released with the
software version.
Technical support
servi[email protected]
http://www.h3c.com
Documentation feedback
You can e-mail your comments about product documentation to [e-mail].
We appreciate your comments.

i
Contents
Ethernet interface commands ······································································································································ 1
Common Ethernet interface commands ··························································································································1
default········································································································································································1
description·································································································································································2
display counters························································································································································2
display counters rate················································································································································4
display interface ·······················································································································································5
display interface brief ··········································································································································· 12
display packet-drop··············································································································································· 15
duplex····································································································································································· 17
flag sdh··································································································································································· 17
flow-control····························································································································································· 18
flow-interval···························································································································································· 19
interface·································································································································································· 20
jumboframe enable ··············································································································································· 20
link-delay ································································································································································ 21
loopback ································································································································································ 22
port link-mode ························································································································································ 23
port-mode ······························································································································································· 24
reset counters interface ········································································································································· 24
reset packet-drop interface··································································································································· 25
shutdown ································································································································································ 26
speed ······································································································································································ 26
Layer 2 Ethernet interface/subinterface commands ··································································································· 27
broadcast-suppression ·········································································································································· 27
mdix-mode······························································································································································ 28
multicast-suppression············································································································································· 29
port up-mode·························································································································································· 30
unicast-suppression················································································································································ 31
Layer 3 Ethernet interface or subinterface commands ······························································································· 32
mtu ·········································································································································································· 32
Loopback and null interface commands···················································································································34
default····································································································································································· 34
description······························································································································································ 34
display interface loopback··································································································································· 35
display interface null ············································································································································· 38
interface loopback ················································································································································ 39
interface null··························································································································································· 40
reset counters interface loopback ························································································································ 41
reset counters interface null ·································································································································· 41
shutdown ································································································································································ 42
Bulk interface configuration commands ···················································································································43
interface range ······················································································································································ 43
interface range name············································································································································ 44
Index ···········································································································································································46

1
Ethernet interface commands
•A switch operating in standard mode does not support Layer 3 Ethernet interfaces, Layer 3 Ethernet
subinterfaces, Layer 3 aggregate interfaces, or Layer 3 aggregate subinterfaces. For more
information about the system operating mode commands, see Fundamentals Command Reference.
•When enhanced IRF is enabled on a switch operating in IRF mode, you cannot create Layer 3
Ethernet interfaces, Layer 3 Ethernet subinterfaces, Layer 3 aggregate interfaces, or Layer 3
aggregate subinterfaces on the switch. For more information about IRF, see IRF Configuration
Guide.
Common Ethernet interface commands
default
Use default to restore the default settings for an Ethernet interface or subinterface.
Syntax
default
Views
Ethernet interface view, Ethernet subinterface view
Predefined user roles
network-admin
mdc-admin
Usage guidelines
CAUTION:
The default command might interrupt ongoing network services. Make sure you are fully aware of the
impacts of this command when you use it in a live network.
This command might fail to restore the default settings for some commands for reasons such as command
dependencies and system restrictions. Use the display this command in interface view to identify these
commands, and then use their undo forms or follow the command reference to individually restore their
default settings. If your restoration attempt still fails, follow the error message instructions to resolve the
problem.
Examples
# Restore the default settings for interface GigabitEthernet 3/0/1.
<Sysname> system-view
[Sysname] interface GigabitEthernet 3/0/1
[Sysname-GigabitEthernet3/0/1] default
# Restore the default settings for Layer 3 subinterface GigabitEthernet 3/0/1.1.
<Sysname> system-view
[Sysname] interface GigabitEthernet 3/0/1.1

2
[Sysname-GigabitEthernet3/0/1.1] default
description
Use description to change the description of an interface.
Use undo description to restore the default.
Syntax
description text
undo description
Default
The description of an interface is the interface name plus Interface (for example, GigabitEthernet3/0/1
Interface).
Views
Ethernet interface view, Ethernet subinterface view
Predefined user roles
network-admin
mdc-admin
Parameters
text: Specifies the interface description, a case-sensitive string of 1 to 80 characters.
Examples
# Change the description of interface GigabitEthernet 3/0/1 to lanswitch-interface.
<Sysname> system-view
[Sysname] interface GigabitEthernet 3/0/1
[Sysname-GigabitEthernet3/0/1] description lanswitch-interface
# Change the description of Ethernet subinterface GigabitEthernet 3/0/1.1 to l2-subinterface3/0/1.1.
<Sysname> system-view
[Sysname] interface GigabitEthernet 3/0/1.1
[Sysname-GigabitEthernet3/0/1.1] description l2-subinterface3/0/1.1
display counters
Use display counters to display interface traffic statistics.
Syntax
display counters {inbound |outbound }interface [ interface-type [ interface-number |
interface-number.subnumber ] ]
Views
Any view
Predefined user roles
network-admin
network-operator
mdc-admin

3
mdc-operator
Parameters
inbound: Displays inbound traffic statistics.
outbound: Displays outbound traffic statistics.
interface-type: Specifies an interface type.
interface-number: Specifies an interface number.
interface-number.subnumber: Specifies a subinterface number, where interface-number is a main
interface (which must be a Layer 3 Ethernet interface) number, and subnumber is the number of a
subinterface created under the interface. The value range for the subnumber argument is 1 to 4094.
Usage guidelines
This command displays traffic statistics within a statistics polling interval specified by the flow-interval
command.
To clear the Ethernet interface traffic statistics, use the reset counters interface command. For more
information, see "reset counters interface."
If no interface type is specified, this command displays traffic statistics for all interfaces that have traffic
counters.
If an interface type is specified but no interface number or subinterface number is specified, this
command displays traffic statistics for all interfaces of the specified type.
If an interface type and an interface number or subinterface number are specified, this command
displays traffic statistics of the specified interface or subinterface.
Examples
# Display inbound traffic statistics for all GigabitEthernet interfaces.
<Sysname> display counters inbound interface GigabitEthernet
Interface Total (pkts) Broadcast (pkts) Multicast (pkts) Err (pkts)
GE3/0/1 100 100 0 0
GE3/0/2 0 0 0 0
GE3/0/3 Overflow Overflow Overflow Overflow
GE3/0/4 0 0 0 0
......
Overflow: More than 14 digits (7 digits for column "Err").
--: Not supported.
Table 1 Command output
Field Description
Interface Abbreviated interface name.
Total (pkts) Total number of packets received or sent through the interface.
Broadcast (pkts) Total number of broadcast packets received or sent through the interface.
Multicast (pkts) Total number of multicast packets received or sent through the interface.
Err (pkts) Total number of error packets received or sent through the interface.

4
Field Description
Overflow: More than 14
digits (7 digits for column
"Err")
The command displays Overflow if any of the following cases applies:
•The data length of an Err field value is greater than 7 decimal digits.
•The data length of a non-Err field value is greater than 14 decimal digits.
--: Not supported The statistical item is not supported.
Related commands
•flow-interval
•reset counters interface
display counters rate
Use display counters rate to display traffic rate statistics of interfaces in up state over the last statistics
polling interval.
Syntax
display counters rate {inbound |outbound }interface [ interface-type [ interface-number |
interface-number.subnumber ] ]
Views
Any view
Predefined user roles
network-admin
network-operator
mdc-admin
mdc-operator
Parameters
inbound: Displays inbound traffic rate statistics.
outbound: Displays outbound traffic rate statistics.
interface-type: Specifies an interface type.
interface-number: Specifies an interface number.
interface-number.subnumber: Specifies a subinterface number, where interface-number is a main
interface (which must be a Layer 3 Ethernet interface) number, and subnumber is the number of a
subinterface created under the interface. The value range for the subnumber argument is 1 to 4094.
Usage guidelines
The statistics cover only interfaces in up state.
If an interface type is specified, the command displays traffic rate statistics for all up interfaces of the
specified type over the last statistics polling interval.
If no interface type is specified, the command displays traffic rate statistics for all up interfaces that have
traffic counters over the last statistics polling interval.
If an interface which is always down over the last statistics polling interval is specified, the system prompts
that the interface does not support the command.

5
You can use the flow-interval command to set the statistics polling interval.
Examples
# Display the inbound traffic rate statistics for all GigabitEthernet interfaces.
<Sysname> display counters rate inbound interface gigabitethernet
Interface Total (pps) Broadcast (pps) Multicast (pps)
GE3/0/1 200 100 100
GE3/0/2 300 200 100
GE3/0/3 300 200 100
......
Overflow: More than 14 digits.
--: Not supported.
Table 2 Command output
Field Description
Interface Abbreviated interface name.
Total (pkts/sec) Average rate (in pps) of receiving or sending packets during the statistics
polling interval.
Broadcast (pkts/sec) Average rate (in pps) of receiving or sending broadcast packets during the
statistics polling interval.
Multicast (pkts/sec) Average rate (in pps) of receiving or sending multicast packets during the
statistics polling interval.
Overflow: more than 14
decimal digits
The command displays Overflow if the data length of a statistical item is
greater than 14 decimal digits.
--: not supported The statistical item is not supported.
Related commands
•flow-interval
•reset counters interface
display interface
Use display interface to display Ethernet interface information.
Syntax
display interface [ interface-type [ interface-number |interface-number.subnumber ] ]
Views
Any view
Predefined user roles
network-admin
network-operator
mdc-admin
mdc-operator

6
Parameters
interface-type: Specifies an interface type.
interface-number: Specifies an interface number.
interface-number.subnumber: Specifies a subinterface number, where interface-number is a main
interface (which must be a Layer 3 Ethernet interface) number, and subnumber is the number of a
subinterface created under the interface. The value range for the subnumber argument is 1 to 4094.
Usage guidelines
If no interface type is specified, this command displays information about all interfaces.
If an interface type is specified but no interface number or subinterface number is specified, this
command displays information about all interfaces of that type.
If both the interface type and interface number are specified, this command displays information about
the specified interface.
Examples
# Display information about Layer 3 interface GigabitEthernet 3/0/1.
<Sysname> display interface GigabitEthernet 3/0/1
GigabitEthernet3/0/1 current state: DOWN
Line protocol current state: DOWN
Description: GigabitEthernet3/0/1 Interface
The Maximum Transmit Unit is 100, Hold timer is 10(sec)
Internet protocol processing: disabled
IP Packet Frame Type:PKTFMT_ETHNT_2, Hardware Address: 0001-0001-0001
IPV6 Packet Frame Type:PKTFMT_ETHNT_2, Hardware Address: 0001-0001-0001
Media type is twisted pair, Port hardware type is 1000_BASE_T
Port priority: 2
Loopback is not set
Unknown-speed mode, Unknown-duplex mode
Last 300 seconds input: 0 packets/sec 0 bytes/sec 0
Last 300 seconds output: 0 packets/sec 0 bytes/sec 0
Input (total): 0 packets, 0 bytes
0 broadcasts, 0 multicasts, - pauses
Input (normal): 0 packets, 0 bytes
0 broadcasts, 0 multicasts, 0 pauses
Input: 0 input errors, 0 runts, 0 giants, 0 throttles
0 CRC, 0 frame, 0 overruns, - aborts
- ignored, - parity errors
Output (total): 0 packets, 0 bytes
0 broadcasts, 0 multicasts, - pauses
Output (normal): 0 packets, 0 bytes
0 broadcasts, 0 multicasts, 0 pauses
Output: 0 output errors, - underruns, - buffer failures
0 aborts, 0 deferred, 0 collisions, 0 late collisions
- lost carrier, - no carrier
Peak value of input: 0 bytes/sec, at 2011-12-23 09:05:58
Peak value of output: 0 bytes/sec, at 2011-12-23 09:05:58

7
Table 3 Command output
Field Description
GigabitEthernet3/0/1 current state
State of the interface:
•Administratively DOWN—The Ethernet interface was shut down
with the shutdown command. The interface is administratively
down.
•DOWN—The Ethernet interface is administratively up but
physically down (possibly because no physical link is present or
the link has failed).
•UP—The Ethernet interface is both administratively and physically
up.
Line protocol current state Link layer state of the interface. The state is determined through
parameter negotiation on the link layer.
Hold timer is Link-up or link-down event suppression interval.
Internet protocol processing: disabled Indicates that the interface cannot process IP packets.
Media type
Physical media type of the interface:
•twisted pair
•optical fiber
Loopback is set internal An internal loopback test is running on the Ethernet interface.
Loopback is not set No loopback test is running on the Ethernet interface.
Unknown-speed mode The speed of the interface is unknown, because the speed
negotiation fails or the interface is not physically connected.
Unknown-duplex mode The duplex mode of the interface is unknown, because the duplex
mode negotiation fails or the interface is not physically connected.
Last 300 seconds input rate
Average input rate over the last 300 seconds in Bps, bps, and pps.
You can use the flow-interval command to set the statistics polling
interval.
Last 300 seconds output rate
Average output rate over the last 300 seconds in Bps, bps, and pps.
You can use the flow-interval command to set the statistics polling
interval.
Input (total):
Input (normal):
Input:
Output (total):
Output (normal):
Output:
Statistics about input/output packets and errors. For more
information, see Table 4.
A hyphen (-) indicates that the statistical item is not supported.
Peak value of input Peak rate of inbound traffic in Bps, and the time when the peak
inbound traffic rate occurred.
Peak value of output Peak rate of outbound traffic in Bps, and the time when the peak
outbound traffic rate occurred.
# Display detailed information about Layer 2 interface GigabitEthernet 3/0/1.
<Sysname> display interface GigabitEthernet 3/0/1

8
GigabitEthernet3/0/1 current state: DOWN
Line protocol current state: DOWN
IP Packet Frame Type: PKTFMT_ETHNT_2, Hardware Address: 000c-2963-b767
Description: GigabitEthernet3/0/1 Interface
Loopback is not set
Media type is twisted pair, Port hardware type is 1000_BASE_T
1000Mbps-speed mode, full-duplex mode
Link speed type is autonegotiation, link duplex type is autonegotiation
Flow-control is not enabled
The Maximum Frame Length is 9216
Allow jumbo frame to pass
Broadcast MAX-ratio: 100%
Multicast MAX-ratio: 100%
Unicast MAX-ratio: 100%
PVID: 1
Mdi type: automdix
Port link-type: access
Tagged Vlan: none
UnTagged Vlan: 1
Port priority: 2
Last clearing of counters: Never
Peak value of input: 0 bytes/sec, at 2000-01-01 00:00:00
Peak value of output: 0 bytes/sec, at 2000-01-01 00:00:00
Last 300 seconds input: 0 packets/sec 0 bytes/sec 0%
Last 300 seconds output: 0 packets/sec 0 bytes/sec 0%
Input (total): 0 packets, 0 bytes
0 unicasts, 0 broadcasts, 0 multicasts, - pauses
Input (normal): 0 packets, 0 bytes
0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses
Input: 0 input errors, 0 runts, 0 giants, 0 throttles
0 CRC, 0 frame, 0 overruns, - aborts
- ignored, - parity errors
Output (total): 0 packets, 0 bytes
0 unicasts, 0 broadcasts, 0 multicasts, - pauses
Output (normal): 0 packets, 0 bytes
0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses
Output: 0 output errors, - underruns, - buffer failures
0 aborts, 0 deferred, 0 collisions, 0 late collisions
- lost carrier, - no carrier

9
Table 4 Command output
Field Description
GigabitEthernet3/0/1 current state
State of the Ethernet interface:
•Administratively DOWN—The Ethernet interface was shut down
with the shutdown command. The interface is administratively
down.
•DOWN—The Ethernet interface is administratively up but
physically down (possibly because no physical link is present or
the link has failed).
•UP—The Ethernet interface is both administratively and
physically up.
Line protocol current state Link layer state of the interface. The state is determined through
parameter negotiation on the link layer.
IP Packet Frame Type Ethernet framing format. PKTFMT_ETHNT_2 indicates that the
frames are encapsulated in Ethernet II framing format.
Hardware address MAC address of the interface.
Loopback is set internal An internal loopback test is running on the Ethernet interface.
Loopback is not set No loopback test is running on the Ethernet interface.
Media type
Physical media type of the interface:
•twisted pair
•optical fiber
10Mbps-speed mode The interface is operating at 10 Mbps.
100Mbps-speed mode The interface is operating at 100 Mbps.
1000Mbps-speed mode The interface is operating at 1000 Mbps.
Unknown-speed mode The speed of the interface is unknown because the speed
negotiation fails or the interface is physically disconnected.
half-duplex mode The interface is operating in half duplex mode.
full-duplex mode The interface is operating in full duplex mode.
unknown-duplex mode The duplex mode of the interface is unknown because the duplex
mode negotiation fails or the interface is physically disconnected.
Link speed type is autonegotiation The interface is configured with the speed auto command.
Link speed type is force link The interface is configured with a specific speed, for example, 10
Mbps or 100 Mbps, by using the speed command.
link duplex type is autonegotiation The interface is configured with the duplex auto command.
link duplex type is force link The interface is configured with a specific duplex mode, for
example, half or full, by using the duplex command.
Flow-control is not enabled Flow control is not enabled on the interface.
The Maximum Frame Length Maximum Ethernet frame length allowed on the interface.
Allow jumbo frame to pass The interface allows jumbo frames to pass through.
Broadcast MAX- Broadcast storm suppression threshold in ratio, pps, or kbps. The
unit of the threshold depends on your configuration.

10
Field Description
Multicast MAX- Multicast storm suppression threshold in ratio, pps, or kbps. The
unit of the threshold depends on your configuration.
Unicast MAX- Unicast storm suppression threshold in ratio, pps, or kbps. The unit
of the threshold depends on your configuration.
PVID Port VLAN ID (PVID) of the Ethernet interface.
Mdi type
Cable type (depending on your configuration):
•automidx.
•mdi.
•mdix.
Port link-type
Link type of the interface (depending on your configuration):
•access.
•trunk.
•hybrid.
Tagged VLAN ID VLANs for which the interface sends packets without removing
VLAN tags.
Untagged VLAN ID VLANs for which the interface sends packets after removing VLAN
tags.
Port priority Priority of the interface.
Last clearing of counters: Never
Time when the reset counters interface command was last used to
clear statistics on the interface. Never indicates that the reset
counters interface command was never used since the device was
started.
Peak value of input Peak rate of inbound traffic in Bps, and the time when the peak
inbound traffic rate occurred.
Peak value of output Peak rate of outbound traffic in Bps, and the time when the peak
outbound traffic rate occurred.
Last 300 seconds input: 0 packets/sec 0
bytes/sec -%
Last 300 seconds output: 0 packets/sec
0 bytes/sec -%
Average rate of inbound and outbound traffic in the last 300
seconds, in pps and Bps, and the ratio of the actual rate to the
maximum interface rate.
A hyphen (-) indicates that the statistical item is not supported.
Input(total): 0 packets, 0 bytes
0 unicasts, 0 broadcasts, 0
multicasts, 0 pauses
Inbound traffic statistics (in packets and bytes) for the interface. All
inbound normal and abnormal packets and normal pause frames
were counted.
Number of inbound unicast packets, number of inbound
broadcasts, number of inbound multicasts, and number of inbound
pause frames.
A hyphen (-) indicates that the statistical item is not supported.
Input(normal): 0 packets, 0 bytes
0 unicasts, 0 broadcasts, 0
multicasts, 0 pauses
Inbound normal traffic and pause frame statistics (in packets and
bytes) for the interface.
Number of inbound normal unicast packets, number of inbound
normal broadcasts, number of inbound normal multicasts, and
number of inbound normal pause frames.
A hyphen (-) indicates that the statistical item is not supported.

11
Field Description
input errors Number of inbound packets with errors.
runts Number of inbound frames shorter than 64 bytes, in correct format,
and containing valid CRCs.
giants
Number of inbound frames larger than the maximum frame length
supported on the interface.
•For an Ethernet interface that does not permit jumbo frames,
giants refer to frames larger than 1518 bytes (without VLAN tags)
or 1522 bytes (with VLAN tags).
•For an Ethernet interface that permits jumbo frames, giants refer
to frames larger than the maximum length of Ethernet frames that
are allowed to pass through, which is configured when you
configure jumbo frame support on the interface.
throttles Number of times the port is shut down due to buffer or CPU
overload.
CRC Total number of inbound frames that had a normal length, but
contained CRC errors.
frame Total number of inbound frames that contained CRC errors and a
non-integer number of bytes.
overruns Number of packets dropped because the input rate of the port
exceeded the queuing capability.
aborts
Total number of illegal inbound packets:
•Fragment frames—CRC error frames shorter than 64 bytes. The
length can be an integral or non-integral value.
•Jabber frames—CRC error frames greater than the maximum
frame length supported on the Ethernet interface (with an
integral or non-integral length). For an Ethernet interface that
does not permit jumbo frames, jabber frames refer to CRC error
frames greater than 1518 bytes (without VLAN tags) or 1522
bytes (with VLAN tags). For an Ethernet interface that permits
jumbo frames, jabber frames refer to CRC error frames greater
than the maximum length of Ethernet frames that are allowed to
pass through the interface (which is configured when you
configure jumbo frame support on the interface).
•Symbol error frames—Frames that contained at least one
undefined symbol.
•Unknown operation code frames—Non-pause MAC control
frames.
•Length error frames—Frames whose 802.3 length fields did not
match the actual frame length (46 to 1500 bytes).
ignored Number of inbound frames dropped because the receive buffer of
the port ran low.
parity errors Total number of frames with parity errors.

12
Field Description
Output(total): 0 packets, 0 bytes
0 unicasts, 0 broadcasts, 0
multicasts, 0 pauses
Outbound traffic statistics (in packets and bytes) for the interface.
All outbound normal and abnormal packets and normal pause
frames were counted.
Number of outbound unicast packets, number of outbound
broadcasts, number of outbound multicasts, and number of
outbound pause frames.
A hyphen (-) indicates that the statistical item is not supported.
Output(normal): 0 packets, 0 bytes
0 unicasts, 0 broadcasts, 0
multicasts, 0 pauses
Outbound normal traffic and pause frame statistics (in packets and
bytes) for the interface.
Number of outbound normal unicast packets, number of outbound
normal broadcasts, number of outbound normal multicasts, and
number of outbound normal pause frames.
A hyphen (-) indicates that the statistical item is not supported.
output errors Number of outbound packets with errors.
underruns
Number of packets dropped because the output rate of the
interface exceeded the output queuing capability. This is a
low-probability hardware anomaly.
buffer failures Number of packets dropped because the transmit buffer of the
interface ran low.
aborts Number of packets that failed to be transmitted, for example,
because of Ethernet collisions.
deferred Number of frames that the interface deferred to transmit because of
detected collisions.
collisions Number of frames that the interface stopped transmitting because
Ethernet collisions were detected during transmission.
late collisions Number of frames that the interface deferred to transmit after
transmitting their first 512 bits because of detected collisions.
lost carrier
Number of carrier losses during transmission. This counter
increases by one when a carrier is lost, and applies to serial WAN
interfaces.
no carrier
Number of times that the port failed to detect the carrier when
attempting to send frames. This counter increases by one when a
port failed to detect the carrier, and applies to serial WAN
interfaces.
Related commands
reset counters interface
display interface brief
Use display interface brief to display brief Ethernet interface information.
Syntax
display interface [ interface-type [ interface-number |interface-number.subnumber ] ] brief
[ description ]

13
Views
Any view
Predefined user roles
network-admin
network-operator
mdc-admin
mdc-operator
Parameters
interface-type: Specifies an interface type.
interface-number: Specifies an interface number.
interface-number.subnumber: Specifies a subinterface number, where interface-number is a main
interface (which must be a Layer 3 Ethernet interface) number, and subnumber is the number of a
subinterface created under the interface. The value range for the subnumber argument is 1 to 4094.
description: Displays the full description of the specified interface. If the keyword is not specified, the
command displays at most the first 27 characters of the interface description. If the keyword is specified,
the command displays all characters of the interface description.
Usage guidelines
If no interface type is specified, this command displays information about all interfaces.
If an interface type is specified but no interface number or subinterface number is specified, this
command displays information about all interfaces of that type.
If both the interface type and interface number are specified, this command displays information about
the specified interface.
Examples
# Display brief information about all interfaces.
<Sysname> display interface brief
The brief information of interface(s) under route mode:
Link: ADM - administratively down; Stby - standby
Protocol: (s) - spoofing
Interface Link Protocol Main IP Description
GE3/0/1 UP UP 10.1.1.2 Link to CoreRouter
GE3/0/2 Stby DOWN --
Loop0 UP UP(s) 2.2.2.9
NULL0 UP UP(s) --
Vlan1 UP DOWN --
Vlan999 UP UP 192.168.1.42
The brief information of interface(s) under bridge mode:
Link: ADM - administratively down
Speed or Duplex: (a)/A - auto; H - half; F - full
Type: A - access; T - trunk; H - hybrid
Interface Link Speed Duplex Type PVID Description
GE3/0/2 DOWN auto A A 1
GE3/0/3 UP 100M(a) F(a) A 1 aaaaaaaaaaaaaaaaaaaaaaaaaaa

14
GE3/0/4 DOWN auto A A 1
GE3/0/5 DOWN auto A A 1
GE3/0/6 UP 100M(a) F(a) A 1
GE3/0/7 DOWN auto A A 1
GE3/0/8 UP 100M(a) F(a) A 1
GE3/0/9 UP 100M(a) F(a) A 999
# Display brief information about interface GigabitEthernet 3/0/3, including the full description of the
interface.
<Sysname> display interface brief GigabitEthernet 3/0/3 description
The brief information of interface(s) under bridge mode:
Link: ADM - administratively down
Speed or Duplex: (a)/A - auto; H - half; F - full
Type: A - access; T - trunk; H - hybrid
Interface Link Speed Duplex Type PVID Description
GE3/0/3 UP 100M(a) F(a) A 1 aaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
Table 5 Command output
Field Description
The brief information of interface(s)
under route mode: Brief information about Layer 3 interfaces.
Link: ADM - administratively down;
Stby - standby
•ADM—The interface has been shut down by the network
administrator. To recover its physical layer state, run the undo
shutdown command.
•Stby—The interface is a standby interface.
Protocol: (s) – spoofing
If the network layer protocol of an interface is UP, but its link is an
on-demand link or not present at all, this field displays UP (s), where s
represents the spoofing flag. This attribute is typical of interface Null 0
and loopback interfaces.
Interface Interface name.
Link
Physical link state of the interface:
•UP—The link is up.
•DOWN—The link is physically down.
•ADM—The link has been administratively shut down. To recover its
physical state, run the undo shutdown command.
•Stby—The interface is a standby interface.
Protocol
Protocol connection state of the interface:
•UP.
•DOWN.
•UP(s)—The link of the interface is an on-demand link or not present at
all.
Description
Interface description configured by using the description command. If the
description keyword is not specified in the display interface brief
command, the Description field displays at most 27 characters. If the
description keyword is specified in the display interface brief command,
the field displays the full interface description.