20-3
Catalyst 3750 Switch Software Configuration Guide
78-16180-02
Chapter 20 Configuring Flex Links
Monitoring Flex Links
Configuring Flex Links
Beginning in privileged EXEC mode, follow these steps to configure a pair of Flex Links:
This example shows how to configure an interfacewith a backup interface and to verify the configuration:
Switch# configure terminal
Switch(conf)# interface fastethernet1/0/1
Switch(conf-if)# switchport backup interface fastethernet1/0/2
Switch(conf-if)# end
Switch# show interface switchport backup
Switch Backup Interface Pairs:
Active Interface Backup Interface State
------------------------------------------------------------------------------------------
-------------
FastEthernet1/0/1 FastEthernet1/0/2 Active Up/Backup Standby
FastEthernet1/0/3 FastEthernet2/0/4 Active Up/Backup Standby
Port-channel1 GigabitEthernet7/0/1 Active Up/Backup Standby
Monitoring Flex Links
Table 20-1 shows the privileged EXEC command for monitoring Flex Link configuration.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Enter interface configuration mode. The interface can be
a physical Layer 2 interface or a port channel. The valid
port-channel range is 1 to 12.
Step 3
switchport backup interface interface-id Configure a physical Layer 2 interface (or port channel)
as part of a Flex Link pair with the interface. When one
link is forwarding traffic, the other interface is in standby
mode.
Step 4
end Return to privileged EXEC mode.
Step 5
show interface [interface-id] switchport backup Verify the configuration.
Step 6
copy running-config startup config (Optional) Save your entries in the switch startup
configuration file.
Table 20-1 Flex Link Monitoring Command
Command Purpose
show interface
[interface-id] switchport
backup
Display the Flex Link backup interface configured for an interface or all
Flex Links configured on the switch and the state of each active and
backup interface (up or standby mode).
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