Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 1105

Configuring Fast Failover in an EX4200 Virtual Chassis
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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) for
an EX4200 Virtual Chassis, 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
an EX4200 Virtual Chassis Switch or Intermember Link Fails on page 963
Disabling Fast Failover in an EX4200 Virtual Chassis on page 1002
Setting an EX4200 Switch Uplink Module Port as a Virtual Chassis Port (CLI Procedure)
on page 994
Configuring an EX4200 Virtual Chassis (CLI Procedure) on page 981
Configuring an EX4200 Virtual Chassis (J-Web Procedure) on page 985
Understanding Fast Failover in an EX4200 Virtual Chassis on page 906
Chapter 39: Configuring EX4200 Virtual Chassis
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