Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 1067

Meaning
Troubleshooting
Problem
Solution
Related
Documentation
Example: Configuring Fast Failover on Uplink Module VCPs to Reroute Traffic When
an EX4200 Virtual Chassis Switch or Intermember Link Fails
Requirements
Copyright © 2010, Juniper Networks, Inc.
The dedicated VCPs interconnecting the member switches within wiring closets are
displayed as and
vcp-0 vcp-1
(members 0, 2, 5, and 7) across wiring closets are displayed as
as Configured .
To troubleshoot a preprovisioned Virtual Chassis configuration that is interconnected
across wiring closets, perform these tasks:
Troubleshooting Nonoperational VCPs
A VCP shows a status of
down
Check the cable to make sure that it is properly and securely connected to the ports.
Example: Configuring an EX4200 Virtual Chassis with a Master and Backup in a Single
Wiring Closet on page 917
Example: Configuring an EX4200 Virtual Chassis Interconnected Across Multiple Wiring
Closets on page 932
Configuring an EX4200 Virtual Chassis (CLI Procedure) on page 981
Configuring an EX4200 Virtual Chassis (J-Web Procedure) on page 985
The Virtual Chassis fast failover feature is a hardware-assisted failover mechanism that
automatically reroutes traffic and reduces traffic loss in the event of a link or switch
failure. If a link between two members fails, traffic flow between those members must
be rerouted quickly so that there is minimal traffic loss.
Fast failover is enabled by default on all dedicated EX4200 Virtual Chassis ports (VCPs).
This example describes how to configure fast failover on uplink module VCPs in an
EX4200 Virtual Chassis configuration:
Requirements on page 963
Overview and Topology on page 964
Configuration on page 965
Verification on page 966
This example uses the following hardware and software components:
Junos OS Release 9.3 or later for EX Series switches
Six EX4200-24T switches
Chapter 38: EX4200 Virtual Chassis—Configuration Examples
. The uplink module VCPs interconnecting member switches
.
and and identified
1/0 1/1
963