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18-11
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-06
Chapter 18 Configuring Flex Links and the MAC Address-Table Move Update Feature
Configuring Flex Links and MAC Address-Table Move Update
In the following example, VLANs 1 to 50, 60, and 100 to 120 are configured on the switch:
Switch(config)# interface gigabitEthernet 0/6
Switch(config-if)# switchport backup interface gigabitEthernet 0/8 prefer vlan 60,100-120
When both interfaces are up, gigabitethernet port 0/8 forwards traffic for VLANs 60 and 100 to 120 and
gigabitethernet port 0/6 forwards traffic for VLANs 1 to 50.
Switch# show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface Backup Interface State
------------------------------------------------------------------------
GigabitEthernet0/6 GigabitEthernet0/8 Active Up/Backup Standby
Vlans Preferred on Active Interface: 1-50
Vlans Preferred on Backup Interface: 60, 100-120
When a Flex Link interface goes down (LINK_DOWN), VLANs preferred on this interface are moved
to the peer interface of the Flex Link pair. In this example, if interface gigabitethernet port 0/6 goes
down, gigabitethernet port 0/8 carries all VLANs of the Flex Link pair.
Switch# show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface Backup Interface State
------------------------------------------------------------------------
GigabitEthernet0/6 GigabitEthernet0/8 Active Down/Backup Up
Vlans Preferred on Active Interface: 1-50
Vlans Preferred on Backup Interface: 60, 100-120
When a Flex Link interface comes up, VLANs preferred on this interface are blocked on the peer
interface and moved to the forwarding state on the interface that has just come up. In this example, if
interface 0/6 comes up, VLANs preferred on this interface are blocked on the peer interface 0/8 and
forwarded on 0/6.
Switch# show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface Backup Interface State
------------------------------------------------------------------------
GigabitEthernet0/6 GigabitEthernet0/8 Active Up/Backup Standby
Vlans Preferred on Active Interface: 1-50
Vlans Preferred on Backup Interface: 60, 100-120
Step 3
no shutdown Enable the port, if necessary. By default, UNIs and ENIs
are disabled, and NNIs are enabled.
Step 4
switchport backup interface interface-id prefer vlan
vlan-range
Configure a physical Layer 2 interface (or port channel)
as part of a Flex Links pair with the interface, and specify
the VLANs carried on the interface. The VLAN ID range
is 1 to 4094.
Step 5
end Return to privileged EXEC mode.
Step 6
show interfaces [interface-id] switchport backup Verify the configuration.
Step 7
copy running-config startup config (Optional) Save your entries in the switch startup
configuration file.
Command Purpose