Configuring Flex Links - Cisco 7604 Configuration Manual

Chapter 11

Configuring Flex Links

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Configuring Flex Links
To configure Flex Links, perform this task:
Command
Step 1
Router# configure terminal
Step 2
Router(conf)# interface {{ type
{port-channel number }}
Step 3
Router(conf-if)# switchport backup interface
1
{{ type slot/port } | {port-channel number }}
Step 4
Router(conf-if)# exit
Step 5
Router# show interface [{ type
{port-channel number }] switchport backup
Step 6
Router# copy running-config startup config
1. type = ethernet, fastethernet, gigabitethernet, or tengigabitethernet
This example shows how to configure an interface with a backup interface and how to verify the
configuration:
Router# configure terminal
Router(conf)# interface fastethernet1/1
Router(conf-if)# switchport backup interface fastethernet1/2
Router(conf-if)# exit
Router# show interface switchport backup
Router Backup Interface Pairs:
Active Interface
------------------------------------------------------------------------------------------
FastEthernet1/1
FastEthernet1/3
Port-channel1
OL-4266-08
A backup link does not have to be the same type as the active link (Fast Ethernet, Gigabit Ethernet,
or port channel). However, you should configure both Flex Links with similar characteristics so that
there are no loops or changes in operation if the standby link becomes active.
STP is disabled on Flex Links ports. If STP is disabled on the router, be sure that there are no Layer 2
loops in the network topology.
Do not configure any STP features (for example, PortFast, BPDU Guard, and so forth) on Flex Links
ports or the ports to which the links connect.
Configured MAC addresses should be different on active and backup ports. The current CLI
disallows configuring of the same address on two ports. Therefore, users have to reconfigure those
addresses after Flex Links failover.
Port security on Flex Links ports may trigger false violations during Flex Links switchover which
in turn triggers a port security shutdown or restrict action. We do not recommend configuring port
security on Flex Links ports.
1
slot/port } |
1
slot/port } |
Backup Interface
FastEthernet1/2
FastEthernet2/4
GigabitEthernet7/1
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
Purpose
Enters global configuration mode.
Specifies a Layer 2 interface.
Configures the interface as part of a Flex Links pair.
Exits configuration mode.
Verifies the configuration.
(Optional) Saves your entries in the router startup
configuration file.
State
Active Up/Backup Standby
Active Up/Backup Standby
Active Up/Backup Standby
Configuring Flex Links
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