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Cisco Catalyst Switch Module 3110 and 3012 for IBM BladeCenter Software Configuration Guide
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Chapter 20 Configuring Flex Links and the MAC Address-Table Move Update Feature
Configuring Flex Links and MAC Address-Table Move Update
To remove a preemption scheme, use the no switchport backup interface interface-id preemption
mode interface configuration command. To reset the delay time to the default, use the no switchport
backup interface interface-id preemption delay interface configuration command.
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 gigabitethernet1/0/1
Switch(conf-if)#switchport backup interface gigabitethernet1/0/2 preemption mode forced
Switch(conf-if)#switchport backup interface gigabitethernet1/0/2 preemption delay 50
Switch(conf-if)# end
Switch# show interface switchport backup detail
Active Interface Backup Interface State
------------------------------------------------------------------------
GigabitEthernet1/0/1 GigabitEthernet1/0/2 Active Up/Backup Standby
Interface Pair : Gi1/0/1, Gi1/0/2
Preemption Mode : forced
Preemption Delay : 50 seconds
Bandwidth : 100000 Kbit (Gi1/0/1), 100000 Kbit (Gi1/0/2)
Mac Address Move Update Vlan : auto
Step 4
switchport backup interface interface-id preemption
mode [forced | bandwidth | off]
Configure a preemption mechanism and delay for a Flex
Link interface pair. You can configure the preemption as:
• Forced—the active interface always preempts the
backup.
• Bandwidth—the interface with the higher bandwidth
always acts as the active interface.
• Off—no preemption happens from active to backup.
Step 5
switchport backup interface interface-id preemption
delay delay-time
Configure the time delay until a port preempts another
port.
Note Setting a delay time only works with forced and
bandwidth modes.
Step 6
end Return to privileged EXEC mode.
Step 7
show interface [interface-id] switchport backup Verify the configuration.
Step 8
copy running-config startup config (Optional) Save your entries in the switch startup
configuration file.
Command Purpose
