Cisco Catalyst 4500 Series Command Reference Guide

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
rep preempt segment
rep preempt segment
Use the rep preempt segment privileged EXEC command to manually start Resilient Ethernet Protocol
(REP) VLAN load balancing on a segment.
rep preempt segment segment_id
Syntax Description
Defaults Manual preemption is the default behavior.
Command Modes Privileged EXEC
Command History
Usage Guidelines When you enter the rep preempt segment segment-id command, a confirmation message appears before
the command is executed because preemption can cause network disruption.
Enter this command on the switch on the segment that has the primary edge port.
If you do not configure VLAN load balancing, entering this command results in the default
behavior—the primary edge port blocks all VLANs.
You configure VLAN load balancing by entering the rep block port {id port-id | neighbor_offset |
preferred} vlan {vlan-list | all} interface configuration command on the REP primary edge port before
you manually start preemption.
There is not a no version of this command.
Examples This example shows how to manually trigger REP preemption on segment 100 with the confirmation
message:
Switch)# rep preempt segment 100
The command will cause a momentary traffic disruption.
Do you still want to continue? [confirm]
Related Commands
segment-id ID of the REP segment. The range is from 1 to 1024.
Release Modification
12.2(44)SG This command was introduced.
Command Description
rep block port Configures VLAN load balancing.
show interfaces rep [detail] Displays REP configuration and status for all interfaces or the specified
interface.

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