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Chapter 17
Configuring Flex Links
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Note
Configuring Flex Links
Beginning in privileged EXEC mode, follow these steps to configure a pair of Flex Links:
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
no shutdown
Step 4
switchport backup interface interface-id
Step 5
end
Step 6
show interface [interface-id] switchport backup
Step 7
copy running-config startup config
This example shows how to configure an interface with a backup interface and to verify the
configuration:
Switch# configure terminal
Switch(conf)# interface fastethernet0/1
Switch(conf-if)# no shutdown
Switch(conf-if)# switchport backup interface fastethernet0/2
Switch(conf-if)# end
Switch# show interface switchport backup
Switch Backup Interface Pairs:
Active Interface
------------------------------------------------------------------------------------------
FastEthernet0/1
FastEthernet0/3
Port-channel1
78-17058-01
A backup link does not have to be the same type (Fast Ethernet, Gigabit Ethernet, or port channel)
as the active link. However, you should configure both Flex Links with similar characteristics so that
there are no loops or changes in behavior if the standby link begins to forward traffic.
STP is disabled on Flex Link ports. If STP is configured on the switch, Flex Links do not participate
in STP in all VLANs in which STP is configured. With STP not running, be sure that there are no
loops in the configured topology.\
STP is available only on NNIs.
Backup Interface
FastEthernet0/2
FastEthernet0/4
GigabitEthernet0/1
Purpose
Enter global configuration mode.
Specify the interface, and enter interface configuration
mode. The interface can be a physical Layer 2 interface or
a port channel (logical interface). The port-channel range
is 1 to 48.
Enable the port, if necessary. By default, UNIs are
disabled, and NNIs are enabled.
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.
Return to privileged EXEC mode.
Verify the configuration.
(Optional) Save your entries in the switch startup
configuration file.
State
Active Up/Backup Standby
Active Up/Backup Standby
Active Up/Backup Standby
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
Configuring Flex Links
17-3
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