Cisco Catalyst 4500 Series Software Configuration Guide

24-7
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 24 Configuring Flex Links and MAC Address-Table Move Update
Configuring Flex Links
To remove a preemption scheme, enter the no switchport backup interface interface-id preemption
mode interface configuration command. To reset the delay time to the default, enter the
no switchport backup interface interface-id preemption delay interface configuration command.
This example shows how to configure preemption mode as bandwidth 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 gigabitethernet1/2
Switch(conf-if)# switchport backup interface gigabitethernet1/2 preemption mode forced
Switch(conf-if)# switchport backup interface gigabitethernet1/2 preemption delay 50
Switch(conf-if)# end
Switch# show interface switchport backup detail
Active Interface Backup Interface State
------------------------------------------------------------------------
GigabitEthernet1/21 GigabitEthernet1/2 Active Down/Backup Down
Interface Pair : Gi1/21, Gi1/2
Preemption Mode : forced
Preemption Delay : 50 seconds
Bandwidth : 10000 Kbit (Gi1/1), 10000 Kbit (Gi1/2)
Mac Address Move Update Vlan : auto
<output truncated>
Step 4
Switch(conf-if)# switchport backup interface
interface-id preemption mode [forced | bandwidth
| off]
Configures a preemption mechanism and delay for a Flex
Links interface pair. You can configure the preemption
mode as:
• forced—The active interface always preempts the
backup.
• bandwidth—The interface with higher bandwidth
always acts as the active interface.
• off—No preemption occurs from active to backup.
Step 5
Switch(conf-if)# switchport backup interface
interface-id preemption delay delay-time
Configures the delay time until a port preempts another
port.
Note Setting a delay time requires forced or bandwidth
mode.
Step 6
Switch(conf)# end
Returns to privileged EXEC mode.
Step 7
Switch# show interface [interface-id] switchport
backup
Verifies the configuration.
Step 8
Switch# copy running-config startup config
(Optional) Saves your entries in the switch startup
configuration file.
Command Purpose

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E