Peer-Active (Vpls Multihoming For Fec 129) - Juniper EX9200 Features Manual

VPLS Feature Guide for EX9200 Switches

peer-active (VPLS Multihoming for FEC 129)

Syntax
Hierarchy Level
Release Information
Description
146
peer-active;
[edit logical-systems logical-system-name routing-instances instance-name protocols vpls
multi-homing],
[edit logical-systems logical-system-name routing-instances instance-name protocols vpls
multi-homing site site-name],
[edit routing-instances instance-name protocols vpls multi-homing],
[edit routing-instances instance-name protocols vpls multi-homing site site-name]
Statement introduced in Junos OS Release 12.3.
Keep customer edge (CE) interfaces in the up state when all BGP peers go down.
NOTE: In the VPLS documentation, the word router in terms such as PE router
is used to refer to any device that provides routing functions.
Consider a scenario in which two provider edge (PE) routers are sharing two multihomed
sites under one routing instance, with two CE devices, CE1 and CE2.
CE1 PE1
Service Provider
CE2 PE2
If the BGP peering session drops between Router PE1 and Router PE2, each one would
consider itself to be the designated forwarder (DF) for Device CE1 and Device CE2. This
creates a loop through the two CE devices, in which traffic loops from one CE device to
the other then back to the first.
Junos OS overcomes this scenario by dropping all multihomed CE interface traffic on all
multihoming PE routers when the BGP session drops between the PE routers. This
functionality is enabled by default for all sites in a routing instance.
The statement disables the default functionality, so that PE routers keep
peer-active
their multihomed CE interfaces in the up state, even though the BGP peering session is
down.
If you configure this statement in the
disabled for all sites. If you configure this statement for a site, the default functionality
is disabled only for that particular site.
PE3 CE3
multi-homing hierarchy, the default functionality is
Copyright © 2016, Juniper Networks, Inc.