Cisco CATALYST 2960 User Manual

19-10
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
OL-26520-01
Chapter 19 Configuring Flex Links and the MAC Address-Table Move Update Feature
Configuring Flex Links and the 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:
Catalyst 2960-S switch:
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
Catalyst 2960 switch:
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
Catalyst 2960-S switch:
Switch# show interfaces switchport backup detail
Active Interface Backup Interface State
------------------------------------------------------------------------
GigabitEthernet1/0/21 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 3
switchport backup interface interface-id 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.
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 interfaces [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

Cisco CATALYST 2960 Specifications

General

Manageable	Yes
Stacking	No
Model	Catalyst 2960 Series Switches
Power over Ethernet (PoE)	Available on some models (IEEE 802.3af)
VLANs	255 active VLANs
Features	QoS
Operating Temperature	32 to 113°F (0 to 45°C)
Relative Humidity	10% to 85% non-condensing
Power Consumption	Varies by model (30W to 400W)