11-3
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 11 Configuring Flex Links
Configuring Flex Links
• 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.
Configuring Flex Links
To configure Flex Links, perform this task:
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 Backup Interface State
------------------------------------------------------------------------------------------
FastEthernet1/1 FastEthernet1/2 Active Up/Backup Standby
FastEthernet1/3 FastEthernet2/4 Active Up/Backup Standby
Port-channel1 GigabitEthernet7/1 Active Up/Backup Standby
Command Purpose
Step 1
Router# configure terminal
Enters global configuration mode.
Step 2
Router(conf)# interface {{
type
1
slot/port
} |
{port-channel
number
}}
1.
type
= ethernet, fastethernet, gigabitethernet, or tengigabitethernet
Specifies a Layer 2 interface.
Step 3
Router(conf-if)# switchport backup interface
{{
type
1
slot/port
} | {port-channel
number
}}
Configures the interface as part of a Flex Links pair.
Step 4
Router(conf-if)# exit
Exits configuration mode.
Step 5
Router# show interface [{
type
1
slot/port
} |
{port-channel
number
}]
switchport backup
Verifies the configuration.
Step 6
Router# copy running-config startup config
(Optional) Saves your entries in the router startup
configuration file.
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