Cisco HWIC-4ESW - EtherSwitch HWIC Switch User manual

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© 2006 Cisco Systems, Inc. All rights reserved.
Cisco HWIC-4ESW and HWIC-D-9ESW
EtherSwitch Interface Cards
First Published: May 17, 2005
Last Updated: April 15, 2006
This document provides configuration tasks for the 4-port Cisco HWIC-4ESW and the 9-port
Cisco HWIC-D-9ESW EtherSwitch high-speed WAN interface cards (HWICs) hardware feature
supported on Cisco 1800 (modular), Cisco 2800, and Cisco 3800 series integrated services routers.
Cisco EtherSwitch HWICs are 10/100BASE-T Layer 2 Ethernet switches with Layer 3 routing
capability. (Layer 3 routing is forwarded to the host and is not actually performed at the switch.) Traffic
between different VLANs on a switch is routed through the router platform. Any one port on a
Cisco EtherSwitch HWIC may be configured as a stacking port to link to another Cisco EtherSwitch
HWIC or EtherSwitch network module in the same system. An optional power module can also be added
to provide inline power for IP telephones. The HWIC-D-9ESW HWIC requires a double-wide card slot.
This hardware feature does not introduce any new or modified Cisco IOS commands.
Finding Feature Information in This Module
Your Cisco IOS software release may not support all of the features documented in this module. To reach
links to specific feature documentation in this module and to see a list of the releases in which each feature is
supported, use the “Feature Information for the Cisco HWIC-4ESW and the Cisco HWIC-D-9ESW
EtherSwitch Cards” section on page 117.
Finding Support Information for Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image
support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on
Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at
the login dialog box and follow the instructions that appear.

Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards
Contents
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Contents
The following sections provide information about the Cisco EtherSwitch HWICs.
•Prerequisites for EtherSwitch HWICs, page 2
•Restrictions for EtherSwitch HWICs, page 2
•Information About EtherSwitch HWICs, page 3
•How to Configure EtherSwitch HWICs, page 5
•Configuration Examples for EtherSwitch HWICs, page 106
•Additional References, page 116
•Command Reference, page 117
Prerequisites for EtherSwitch HWICs
The following are prerequisites to configuring EtherSwitch HWICs:
•Configuration of IP routing. (Refer to the Cisco IOS IP Configuration Guide.)
•Use of the Cisco IOS T release, beginning with Release 12.3(8)T4 or later for Cisco HWIC-4ESW
and Cisco HWIC-D-9ESW support. (Refer to the Cisco IOS documentation.)
Restrictions for EtherSwitch HWICs
The following restrictions apply to the Cisco HWIC-4ESW and the Cisco HWIC-D-9ESW EtherSwitch
HWICs:
•No more than two Ethernet Switch HWICs or network modules may be installed in a host router.
Multiple Ethernet Switch HWICs or network modules installed in a host router will not act
independently of each other. They must be stacked, as they will not work at all otherwise.
•The ports of a Cisco EtherSwitch HWIC must NOT be connected to the Fast Ethernet/Gigabit
onboard ports of the router.
•There is no inline power on the ninth port (port 8) of the HWIC-D-9ESW card.
•There is no Auto MDIX support on the ninth port (port 8) of the HWIC-D-9ESW card when either
speed or duplex is not set to auto.
•There is no support for online insertion/removal (OIR) of the EtherSwitch HWICs.
•When Ethernet Switches have been installed and configured in a host router, OIR of the
CompactFlash memory card in the router must not occur. OIR of the CompactFlash memory card
will compromise the configuration of the Ethernet Switches.
•VTP pruning is not supported.
•There is a limit of 200 secure MAC addresses per module that can be supported by an EtherSwitch
HWIC.

Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards
Prerequisites for Installing Two Ethernet Switch Network Modules in a Single Chassis
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Prerequisites for Installing Two Ethernet Switch Network
Modules in a Single Chassis
A maximum of two Ethernet switch network modules can be installed in a single chassis. If two Ethernet
switch network modules of any type are installed in the same chassis, the following configuration
requirements must be met:
•Both Ethernet switch network modules must have an optional Gigabit Ethernet expansion board
installed.
•An Ethernet crossover cable must be connected to the two Ethernet switch network modules using
the optional Gigabit Ethernet expansion board ports.
•Intrachassis stacking for the optional Gigabit Ethernet expansion board ports must be configured.
For information about intrachassis stacking configuration, see the 16- and 36-Port Ethernet Switch
Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 series feature document.
Note Without this configuration and connection, duplications will occur in the VLAN databases, and
unexpected packet handling may occur.
Information About EtherSwitch HWICs
To configure the Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch HWICs, you should understand the
following concepts:
•VLANs, page 3
•Inline Power for Cisco IP Phones, page 4
•Layer 2 Ethernet Switching, page 4
•802.1x Authentication, page 4
•Spanning Tree Protocol, page 4
•Cisco Discovery Protocol, page 4
•Switched Port Analyzer, page 4
•IGMP Snooping, page 4
•Storm Control, page 5
•Intrachassis Stacking, page 5
•Fallback Bridging, page 5
VLANs
For information on the concept of VLANs, refer to the material at this URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123newft/123t/123t_4/gt1636nm.ht
m#1047027

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Inline Power for Cisco IP Phones
For information on the concept of inline power for Cisco IP phones, refer to the material at this URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123newft/123t/123t_4/gt1636nm.ht
m#1048439
Layer 2 Ethernet Switching
For information on the concept of Layer 2 Ethernet switching, refer to the material at this URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123newft/123t/123t_4/gt1636nm.ht
m#1048478
802.1x Authentication
For information on the concept of 802.1x authentication, refer to the material at this URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123newft/123t/123t_4/gt1636nm.ht
m#1051006
Spanning Tree Protocol
For information on the concept of Spanning Tree Protocol, refer to the material at this URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123newft/123t/123t_4/gt1636nm.ht
m#1048458
Cisco Discovery Protocol
For information on the concept of the Cisco Discovery Protocol, refer to the material at this URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123newft/123t/123t_4/gt1636nm.ht
m#1048498
Switched Port Analyzer
For information on the concept of switched port analyzer, refer to the material at this URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123newft/123t/123t_4/gt1636nm.ht
m#1053663
IGMP Snooping
For information on the concept of IGMP snooping, refer to the material at this URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123newft/123t/123t_4/gt1636nm.ht
m#1053727

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Storm Control
For information on the concept of storm control, refer to the material at this URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123newft/123t/123t_4/gt1636nm.ht
m#1051018
Intrachassis Stacking
For information on the concept of intrachassis stacking, refer to the material at this URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123newft/123t/123t_4/gt1636nm.ht
m#1051061
Fallback Bridging
For information on the concept of fallback bridging, refer to the material at this URL:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123newft/123t/123t_4/gt1636nm.ht
m#1054833
How to Configure EtherSwitch HWICs
See the following sections for configuration tasks for the EtherSwitch HWICs.
•Configuring VLANs, page 6
•Configuring VLAN Trunking Protocol, page 10
•Configuring Layer 2 Interfaces, page 13
•Configuring 802.1x Authentication, page 23
•Configuring Spanning Tree, page 35
•Configuring MAC Table Manipulation, page 46
•Configuring Cisco Discovery Protocol, page 50
•Configuring the Switched Port Analyzer (SPAN), page 53
•Configuring Power Management on the Interface, page 56
•Configuring IP Multicast Layer 3 Switching, page 57
•Configuring IGMP Snooping, page 61
•Configuring Per-Port Storm Control, page 68
•Configuring Stacking, page 71
•Configuring Fallback Bridging, page 73
•Configuring Separate Voice and Data Subnets, page 89
•Managing the EtherSwitch HWIC, page 92

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Configuring VLANs
This section describes how to configure VLANs on the switch and contains the following sections:
•Adding a VLAN Instance, page 6
•Deleting a VLAN Instance from the Database, page 8
Adding a VLAN Instance
A total of 15 VLANs can be supported by an EtherSwitch HWIC.
Follow the steps below to configure a Fast Ethernet interface as Layer 2 access.
SUMMARY STEPS
1. enable
2. vlan database
3. vlan vlan_id
4. exit
DETAILED STEPS
Verifying the VLAN Configuration
You can verify the VLAN configuration in VLAN database mode.
Use the show command in VLAN database mode to verify the VLAN configuration, as shown below:
Router(vlan)# show
VLAN ISL Id: 1
Name: default
Command Purpose
Step 1 enable
Example:
Router> enable
Enables privileged EXEC mode.
•Enter your password if prompted.
Step 2 vlan database
Example:
Router# vlan database
Enters VLAN configuration mode.
Step 3 vlan vlan_id
Example:
Router(vlan)# vlan 1
Adds an Ethernet VLAN.
Step 4 exit
Example:
Router(vlan)# exit
Updates the VLAN database, propagates it throughout the
administrative domain, and returns to privileged EXEC mode.

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Media Type: Ethernet
VLAN 802.10 Id: 100001
State: Operational
MTU: 1500
Translational Bridged VLAN: 1002
Translational Bridged VLAN: 1003
VLAN ISL Id: 2
Name: VLAN0002
Media Type: Ethernet
VLAN 802.10 Id: 100002
State: Operational
MTU: 1500
VLAN ISL Id: 3
Name: Red_VLAN
Media Type: Ethernet
VLAN 802.10 Id: 100003
State: Operational
MTU: 1500
VLAN ISL Id: 1002
Name: fddi-default
Media Type: FDDI
VLAN 802.10 Id: 101002
State: Operational
MTU: 1500
Bridge Type: SRB
Translational Bridged VLAN: 1
Translational Bridged VLAN: 1003
VLAN ISL Id: 1003
Name: token-ring-default
Media Type: Token Ring
VLAN 802.10 Id: 101003
State: Operational
MTU: 1500
Bridge Type: SRB
Ring Number: 0
Bridge Number: 1
Parent VLAN: 1005
Maximum ARE Hop Count: 7
Maximum STE Hop Count: 7
Backup CRF Mode: Disabled
Translational Bridged VLAN: 1
Translational Bridged VLAN: 1002
VLAN ISL Id: 1004
Name: fddinet-default
Media Type: FDDI Net
VLAN 802.10 Id: 101004
State: Operational
MTU: 1500
Bridge Type: SRB
Bridge Number: 1
STP Type: IBM
VLAN ISL Id: 1005
Name: trnet-default
Media Type: Token Ring Net
VLAN 802.10 Id: 101005
State: Operational
MTU: 1500
Bridge Type: SRB

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Bridge Number: 1
STP Type: IBM
Router(vlan)# exit
APPLY completed.
Exiting....
Router#
Router#
Enter the show vlan-switch command in EXEC mode using the Cisco IOS CLI to verify the VLAN
configuration, as shown below.
Router# show vlan-switch
VLAN Name Status Ports
---- -------------------------------- --------- ----------------------------------
1 default active Fa0/1/1, Fa0/1/2, Fa0/1/3, Fa0/1/4
Fa0/1/5, Fa0/1/6, Fa0/1/7, Fa0/1/8
Fa0/3/0, Fa0/3/2, Fa0/3/3, Fa0/3/4
Fa0/3/5, Fa0/3/6, Fa0/3/7, Fa0/3/8
2 VLAN0002 active Fa0/1/0
3 Red_VLAN active
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 1002 1003
2 enet 100002 1500 - - - - - 0 0
3 enet 100003 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 1 1003
1003 tr 101003 1500 1005 0 - - srb 1 1002
1004 fdnet 101004 1500 - - 1 ibm - 0 0
1005 trnet 101005 1500 - - 1 ibm - 0 0
Router#
Deleting a VLAN Instance from the Database
You cannot delete the default VLANs for the different media types: Ethernet VLAN 1 and FDDI or
Token Ring VLANs 1002 to 1005.
Follow the steps below to delete a VLAN from the database.
SUMMARY STEPS
1. enable
2. vlan database
3. no vlan vlan_id
4. exit

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DETAILED STEPS
Verifying VLAN Deletion
You can verify that a VLAN has been deleted from the switch in VLAN database mode.
Use the show command in VLAN database mode to verify that a VLAN has been deleted from the
switch, as shown in the following output example:
Router(vlan)# show
VLAN ISL Id: 1
Name: default
Media Type: Ethernet
VLAN 802.10 Id: 100001
State: Operational
MTU: 1500
Translational Bridged VLAN: 1002
Translational Bridged VLAN: 1003
VLAN ISL Id: 1002
Name: fddi-default
Media Type: FDDI
VLAN 802.10 Id: 101002
State: Operational
MTU: 1500
Bridge Type: SRB
Translational Bridged VLAN: 1
Translational Bridged VLAN: 1003
<output truncated>
Router(vlan)#
Command Purpose
Step 1 enable
Example:
Router> enable
Enables privileged EXEC mode.
•Enter your password if prompted.
Step 2 vlan database
Example:
Router# vlan database
Enters VLAN configuration mode.
Step 3 no vlan vlan_id
Example:
Router(vlan)# no vlan 1
Deletes an Ethernet VLAN.
Step 4 exit
Example:
Router(vlan)# exit
Updates the VLAN database, propagates it throughout the
administrative domain, and returns to privileged EXEC mode.

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Enter the show vlan-switch brief command in EXEC mode, using the Cisco IOS CLI to verify that a
VLAN has been deleted from the switch, as shown in the following output example:
Router# show vlan-switch brief
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/1/0, Fa0/1/1, Fa0/1/2
Fa0/1/3, Fa0/1/4, Fa0/1/5
Fa0/1/6, Fa0/1/7, Fa0/1/8
300 VLAN0300 active
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
Router#
Configuring VLAN Trunking Protocol
This section describes how to configure the VLAN Trunking Protocol (VTP) on an EtherSwitch HWIC,
and contains the following tasks:
•Configuring a VTP Server, page 10
•Configuring a VTP Client, page 12
•Disabling VTP (VTP Transparent Mode), page 12
•Verifying VTP, page 13
Note VTP pruning is not supported by EtherSwitch HWICs.
Configuring a VTP Server
When a switch is in VTP server mode, you can change the VLAN configuration and have it propagate
throughout the network.
Follow the steps below to configure the switch as a VTP server.
SUMMARY STEPS
1. enable
2. vlan database
3. vtp server
4. vtp domain domain_name
5. vtp password password_value
6. exit

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DETAILED STEPS
Step 1 enable
Example:
Router> enable
Enables privileged EXEC mode.
•Enter your password if prompted.
Step 2 vlan database
Example:
Router# vlan database
Enters VLAN configuration mode.
Step 3 vtp server
Example:
Router(vlan)# vtp server
Configures the switch as a VTP server.
Step 4 vtp domain domain_name
Example:
Router(vlan)# vtp domain distantusers
Defines the VTP domain name, which can be up to 32 characters
long.
Step 5 vtp password password_value
Example:
Router(vlan)# vtp password philadelphis
(Optional) Sets a password, which can be from 8 to 64 characters
long, for the VTP domain.
Step 6 exit
Example:
Router(vlan)# exit
Updates the VLAN database, propagates it throughout the
administrative domain, exits VLAN configuration mode, and
returns to privileged EXEC mode.

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Configuring a VTP Client
When a switch is in VTP client mode, you cannot change the VLAN configuration on the switch. The
client switch receives VTP updates from a VTP server in the management domain and modifies its
configuration accordingly.
Follow the steps below to configure the switch as a VTP client.
SUMMARY STEPS
1. enable
2. vlan database
3. vtp client
4. exit
DETAILED STEPS
Disabling VTP (VTP Transparent Mode)
When you configure the switch as VTP transparent, you disable VTP on the switch. A VTP transparent
switch does not send VTP updates and does not act on VTP updates received from other switches.
Follow the steps below to disable VTP on the switch.
SUMMARY STEPS
1. enable
2. vlan database
3. vtp transparent
4. exit
Step 1 enable
Example:
Router> enable
Enables privileged EXEC mode.
•Enter your password if prompted.
Step 2 vlan database
Example:
Router# vlan database
Enters VLAN configuration mode.
Step 3 vtp client
Example:
Router(vlan)# vtp client
Configures the switch as a VTP client.
Step 4 exit
Example:
Router(vlan)# exit
Updates the VLAN database, propagates it throughout the
administrative domain, exits VLAN configuration mode and
returns to privileged EXEC mode.

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DETAILED STEPS
Verifying VTP
Use the show vtp status command to verify VTP status:
Router# show vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 256
Number of existing VLANs : 5
VTP Operating Mode : Server
VTP Domain Name :
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0xBF 0x86 0x94 0x45 0xFC 0xDF 0xB5 0x70
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
Local updater ID is 1.3.214.25 on interface Fa0/0 (first interface found)
Router#
Configuring Layer 2 Interfaces
This section provides the following configuration information:
•Configuring a Range of Interfaces, page 14 (required)
•Defining a Range Macro, page 14 (optional)
•Configuring Layer 2 Optional Interface Features, page 15 (optional)
Step 1 enable
Example:
Router> enable
Enables privileged EXEC mode.
•Enter your password if prompted.
Step 2 vlan database
Example:
Router# vlan database
Enters VLAN configuration mode.
Step 3 vtp transparent
Example:
Router(vlan)# vtp transparent
Configures VTP transparent mode.
Step 4 exit
Example:
Router(vlan)# exit
Updates the VLAN database, propagates it throughout the
administrative domain, exits VLAN configuration mode, and
returns to privileged EXEC mode.

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Configuring a Range of Interfaces
Use the following task to configure a range of interfaces.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface range {macro macro_name | FastEthernet interface-id [ -interface-id]| vlan vlan_ID}
[, FastEthernet interface-id [ - interface-id] | vlan vlan-ID]
DETAILED STEPS
Defining a Range Macro
Use the following task to define an interface range macro.
SUMMARY STEPS
1. enable
2. configure terminal
3. define interface-range macro_name {FastEthernet interface-id [ -interface-id] | {vlan vlan_ID -
vlan_ID} | [,FastEthernet interface-id [ -interface-id]
Command or Action Purpose
Step 1 enable
Example:
Router> enable
Enables privileged EXEC mode.
•Enter your password if prompted.
Step 2 configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3 interface range {macro macro_name |
FastEthernet interface-id [ - interface-id] |
vlan vlan-ID} [,FastEthernet interface-id [ -
interface-id] | vlan vlan-ID]
Example:
Router(config)# interface range FastEthernet
0/1/0 - 0/1/3
Select the range of interfaces to be configured.
•The space before the dash is required. For example, the
command interface range fastethernet 0/<slot>/0 -
0/<slot>/3is valid; the command interface range
fastethernet 0/<slot>/0-0/<slot>/3 is not valid.
•You can enter one macro or up to five comma-separated
ranges.
•Comma-separated ranges can include both VLANs and
physical interfaces.
•You are not required to enter spaces before or after the
comma.
•The interface range command only supports VLAN
interfaces that are configured with the interface vlan
command.

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DETAILED STEPS
Verifying Configuration of an Interface Range Macro
Use the show running-configuration command to show the defined interface-range macro
configuration, as shown below:
Router# show running-configuration | include define
define interface-range first_three FastEthernet0/1/0 - 2
Configuring Layer 2 Optional Interface Features
•Interface Speed and Duplex Configuration Guidelines, page 15
•Configuring the Interface Speed, page 16
•Configuring the Interface Duplex Mode, page 16
•Verifying Interface Speed and Duplex Mode Configuration, page 17
•Configuring a Description for an Interface, page 18
•Configuring a Fast Ethernet Interface as a Layer 2 Trunk, page 19
•Configuring a Fast Ethernet Interface as Layer 2 Access, page 21
Interface Speed and Duplex Configuration Guidelines
When configuring an interface speed and duplex mode, note these guidelines:
•If both ends of the line support autonegotiation, Cisco highly recommends the default auto
negotiation settings.
•If one interface supports auto negotiation and the other end does not, configure duplex and speed on
both interfaces; do not use the auto setting on the supported side.
•Both ends of the line need to be configured to the same setting; for example, both hard-set or both
auto-negotiate. Mismatched settings are not supported.
Command or Action Purpose
Step 1 enable
Example:
Router> enable
Enables privileged EXEC mode.
•Enter your password if prompted.
Step 2 configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3 define interface-range macro_name {FastEthernet
interface-id [ -interface-id] | {vlan vlan_ID
-vlan-ID} | [,FastEthernet interface-id [ -
interface-id]
Example:
Router(config)# define interface-range
first_three FastEthernet0/1/0 - 2
•Defines a range of macros.

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Caution Changing the interface speed and duplex mode configuration might shut down and reenable the interface
during the reconfiguration.
Configuring the Interface Speed
Use the following task to set the interface speed.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface fastethernet interface-id
4. speed [10 | 100 | auto]
DETAILED STEPS
Note If you set the interface speed to auto on a 10/100-Mbps Ethernet interface, both speed and duplex are
automatically negotiated.
Configuring the Interface Duplex Mode
Follow the steps below to set the duplex mode of a Fast Ethernet interface.
Command or Action Purpose
Step 1 enable
Example:
Router> enable
Enables privileged EXEC mode.
•Enter your password if prompted.
Step 2 configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3 interface fastethernet interface-id
Example:
Router(config)# interface fastethernet 0/1/0
Selects the interface to be configured.
Step 4 speed [10 | 100 | auto ]
Example:
Router(config-if)# speed 100
Selects the interface to be configured.

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SUMMARY STEPS
1. enable
2. configure terminal
3. interface fastethernet interface-id
4. duplex [auto | full | half]
DETAILED STEPS
Note If you set the port speed to auto on a 10/100-Mbps Ethernet interface, both speed and duplex are
automatically negotiated. You cannot change the duplex mode of auto negotiation interfaces.
The following example shows how to set the interface duplex mode to auto on Fast Ethernet interface 3:
Router(config)# interface fastethernet 0/1/0
Router(config-if)# speed 100
Router(config-if)# duplex auto
Router(config-if)# end
Verifying Interface Speed and Duplex Mode Configuration
Use the show interfaces command to verify the interface speed and duplex mode configuration for an
interface, as shown in the following output example.
Router# show interfaces fastethernet 0/1/0
FastEthernet0/1/0 is up, line protocol is up
Hardware is Fast Ethernet, address is 000f.f70a.f272 (bia 000f.f70a.f272)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Command or Action Purpose
Step 1 enable
Example:
Router> enable
Enables privileged EXEC mode.
•Enter your password if prompted.
Step 2 configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3 interface fastethernet interface-id
Example:
Router(config)# interface fastethernet 0/1/0
Selects the interface to be configured.
Step 4 duplex [auto | full | half]
Example:
Router(config-if)# duplex auto
Sets the duplex mode of the interface.

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Auto-duplex, Auto-speed
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:11, output never, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
4 packets input, 1073 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
6 packets output, 664 bytes, 0 underruns(0/0/0)
0 output errors, 0 collisions, 3 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Router#
Configuring a Description for an Interface
You can add a description of an interface to help you remember its function. The description appears in
the output of the following commands: show configuration, show running-config, and show
interfaces.
Use the description command to add a description for an interface.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface fastethernet interface-id
4. description string

Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards
How to Configure EtherSwitch HWICs
19
Book Title
DETAILED STEPS
Configuring a Fast Ethernet Interface as a Layer 2 Trunk
Use this task to configure a Fast Ethernet interface as a Layer 2 trunk.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface fastethernet interface-id
4. shutdown
5. switchport mode trunk
6. switchport trunk native vlan vlan-num
7. switchport trunk allowed vlan {add | except | none | remove} vlan1[,vlan[,vlan[,...]]
8. no shutdown
9. end
Command or Action Purpose
Step 1 enable
Example:
Router> enable
Enables privileged EXEC mode.
•Enter your password if prompted.
Step 2 configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3 interface fastethernet interface-id
Example:
Router(config)# interface fastethernet 0/1/0
Selects the interface to be configured.
Step 4 description string
Example:
Router(config-if)# description newinterface
Adds a description for an interface.

Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards
How to Configure EtherSwitch HWICs
20
Book Title
DETAILED STEPS
Command or Action Purpose
Step 1 enable
Example:
Router> enable
Enables privileged EXEC mode.
•Enter your password if prompted.
Step 2 configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3 interface fastethernet interface-id
Example:
Router(config)# interface fastethernet 0/1/0
Selects the interface to be configured.
Step 4 shutdown
Example:
Router(config-if)# shutdown
(Optional) Shuts down the interface to prevent traffic flow
until configuration is complete.
Step 5 switchport mode trunk
Example:
Router(config-if)# switchport mode trunk
Configures the interface as a Layer 2 trunk.
Note Encapsulation is always dot1q.
Step 6 switchport trunk native vlan vlan-num
Example:
Router(config-if)# switchport trunk native vlan
1
(Optional) For 802.1Q trunks, specifies the native VLAN.
Step 7 switchport trunk allowed vlan {add | except |
none | remove} vlan1[,vlan[,vlan[,...]]
Example:
Router(config-if)# switchport trunk allowed
vlan add vlan1, vlan2, vlan3
(Optional) Configures the list of VLANs allowed on the trunk.
All VLANs are allowed by default. You cannot remove any of
the default VLANs from a trunk.
Step 8 no shutdown
Example:
Router(config-if)# no shutdown
Activates the interface. (Required only if you shut down the
interface.)
Step 9 end
Example:
Router(config-if)# end
Exits configuration mode.