Juniper JUNOS OS 10.3 - SOFTWARE Manual page 1125

Configuring Fast Failover in a Virtual Chassis Configuration
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Copyright © 2010, Juniper Networks, Inc.
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.
While fast failover is enabled by default on dedicated Virtual Chassis ports (VCPs), you
must manually enable fast failover on uplink module ports that have been configured
as VCPs.
Before you begin configuring fast failover, ensure that the dedicated VCPs or uplink
module VCPs are connected in a ring topology.
To reenable the fast failover feature on all dedicated VCPs in a ring:
[edit]
user@switch# delete virtual-chassis fast-failover vcp disable
To configure the fast failover feature on all XFP uplink module VCPs in a ring:
[edit]
user@switch# set virtual-chassis fast-failover xe
To configure the fast failover feature on all SFP uplink module VCPs in a ring:
[edit]
user@switch# set virtual-chassis fast-failover ge
Example: Configuring Fast Failover on Uplink Module VCPs to Reroute Traffic When a
Virtual Chassis Member Switch or Intermember Link Fails on page 993
Disabling Fast Failover in a Virtual Chassis Configuration on page 1030
Setting an Uplink Module Port as a Virtual Chassis Port (CLI Procedure) on page 1023
Configuring a Virtual Chassis (CLI Procedure) on page 1011
Configuring a Virtual Chassis (J-Web Procedure) on page 1015
Understanding Fast Failover in a Virtual Chassis Configuration on page 936
Chapter 45: Configuring Virtual Chassis
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