Configuring Flex Links And Mac Address-Table Move Update - Cisco Catalyst 3120 Software Manual

Chapter 20 Configuring Flex Links and the MAC Address-Table Move Update Feature
Beginning in privileged EXEC mode, follow these steps to configure a preemption scheme for a pair of
Flex Links:
Command
Step 1 configure terminal
Step 2
interface interface-id
Step 3
switchport backup interface interface-id
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
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
OL-12247-01

Configuring Flex Links and MAC Address-Table Move Update

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.
Configure a physical Layer 2 interface (or port channel)
as part of a Flex Links pair with the interface. When one
link is forwarding traffic, the other interface is in standby
mode.
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.
Note Setting a delay time only works with forced and
bandwidth modes.
Return to privileged EXEC mode.
Verify the configuration.
(Optional) Save your entries in the switch startup
configuration file.
Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide
20-7