Cisco Catalyst 2960 Series User Manual

Restrictions for Configuring Flex Links and MAC Address-Table Move Update, on page 373
Configuring Flex Links: Examples, on page 387
Flex Links Configuration, on page 375
Monitoring Flex Links, Multicast Fast Convergence, and MAC Address-Table Move Update, on page
386
Configuring Flex Links: Examples, on page 387
Configuring a Preemption Scheme for a Pair of Flex Links
SUMMARY STEPS
1.
configure terminal
2.
interface interface-id
3.
switchport backup interface interface-id
4.
switchport backup interface interface-id preemption mode [forced | bandwidth | off]
5.
switchport backup interface interface-id preemption delay delay-time
6.
end
7.
show interface [interface-id] switchport backup
8.
copy running-config startup config
DETAILED STEPS
PurposeCommand or Action
Enters global configuration modeconfigure terminal
Example:
Switch# configure terminal
Step 1
Specifies the interface, and enters 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 24.
interface interface-id
Example:
Switch(conf)# interface gigabitethernet1/0/1
Step 2
Configures 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.
switchport backup interface interface-id
Example:
Switch(conf-if)# switchport backup interface
Step 3
gigabitethernet1/0/2
Configures a preemption mechanism and delay for a Flex Links
interface pair. You can configure the preemption as:
switchport backup interface interface-id preemption
mode [forced | bandwidth | off]
Step 4
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
381
How to Configure Flex Links and the MAC Address-Table Move Update Feature

Cisco Catalyst 2960 Series Specifications

General

Layer	Layer 2
Power over Ethernet (PoE)	Available on some models
RAM	128 MB
Flash Memory	32 MB
MAC Address Table Size	8000
Operating Temperature	0°C to 45°C (32 to 113°F)
Ports	24 or 48 x 10/100/1000