Cisco IE-4000 Software Configuration Manual page 390

Configuring FlexLinks and the MAC Address-Table Move Update
Configuration Examples for the FlexLinks and MAC Address-Table Move Update
Active Interface
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Vlans Preferred on Active Interface: 1-3,5-4096
Vlans Preferred on Backup Interface: 4
Configuring a Preemption Scheme: Example
This example shows how to configure the preemption mode as forced for a backup interface pair and to verify the
configuration:
Switch# configure terminal
Switch(conf)# interface GigabitEthernet1/17
Switch(conf-if)#switchport backup interface GigabitEthernet1/18 preemption mode forced
Switch(conf-if)#switchport backup interface GigabitEthernet1/18 preemption delay 50
Switch(conf-if)# end
Switch# show interfaces switchport backup detail
Active Interface Backup Interface State
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GigabitEthernet1/17 GigabitEthernet1/18 Active Up/Backup Standby
Interface Pair : Gi1/17, Gi1/18
Preemption Mode : forced
Preemption Delay : 50 seconds
Bandwidth : 100000 Kbit (Gi1/17), 100000 Kbit (Gi1/18)
Mac Address Move Update Vlan : auto
Configuring VLAN Load Balancing on FlexLinks: Examples
In the following example, VLANs 1 to 50, 60, and 100 to 120 are configured on the switch:
Switch(config)# interface gigabitEthernet 1/2
Switch(config-if)# switchport backup interface gigabitEthernet 1/2 prefer vlan 60,100-120
When both interfaces are up, GigabitEthernet1/17 forwards traffic for VLANs 60 and 100 to 120, and GigabitEthernet1/18
forwards traffic for VLANs 1 to 50.
Switch# show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface
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GigabitEthernet1/17
Vlans Preferred on Active Interface: 1-50
Vlans Preferred on Backup Interface: 60, 100-120
When a FlexLinks interface goes down (LINK_DOWN), VLANs preferred on this interface are moved to the peer interface
of the FlexLinks pair. In this example, if interface Gigabit Ethernet1/1 goes down, Gigabit Ethernet1/2 carries all VLANs
of the FlexLinks pair.
Switch# show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface
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GigabitEthernet1/17
Vlans Preferred on Active Interface: 1-50
Vlans Preferred on Backup Interface: 60, 100-120
Backup Interface
Backup Interface
GigabitEthernet1/18
Backup Interface
GigabitEthernet1/18
State
State
Active Up/Backup Standby
State
Active Down/Backup Up
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