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Chapter 19
Configuring Flex Links and the MAC Address-Table Move Update Feature
Command
Step 4
switchport backup interface interface-id preemption
mode [forced | bandwidth | off]
Step 5
switchport backup interface interface-id preemption
delay delay-time
Step 6
end
Step 7
show interface [interface-id] switchport backup
Step 8
copy running-config startup config
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 gigabitethernet0/1
Switch(conf-if)#switchport backup interface gigabitethernet0/2 preemption mode forced
Switch(conf-if)#switchport backup interface gigabitethernet0/2 preemption delay 50
Switch(conf-if)# end
Switch# show interface switchport backup detail
Active Interface Backup Interface State
------------------------------------------------------------------------
GigabitEthernet0/21 GigabitEthernet0/2 Active Up/Backup Standby
Interface Pair : Gi0/1, Gi0/2
Preemption Mode : forced
Preemption Delay : 50 seconds
Bandwidth : 100000 Kbit (Gi0/1), 100000 Kbit (Gi0/2)
Mac Address Move Update Vlan : auto
Configuring VLAN Load Balancing on Flex Links
Beginning in privileged EXEC mode, follow these steps to configure VLAN load balancing on Flex
Links:
Command
Step 1
configure terminal
Step 2
interface interface-id
OL-8915-03
Configuring Flex Links and MAC Address-Table Move Update
Purpose
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.
•
Configure the time delay until a port preempts another
port.
Setting a delay time only works with forced and
Note
bandwidth modes.
Return to privileged EXEC mode.
Verify the configuration.
(Optional) Save your entries in the switch startup
configuration file.
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.
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
19-7
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