Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - SERVICE AVAILABILITY CONFIGURATION GUIDE 2010-10-08 Configuration Manual page 69

Copyright © 2010, Juniper Networks, Inc.
Table 8: Application Support for Stateful SRP Switchover (continued)
Application Supported
MGTM
MLD
PIM
Chapter 3: Managing Stateful SRP Switchover
Unsupported Notes
– On SRP failover, old mroutes are
retained on the line module to preserve
multicast forwarding; cache-misses to
the SRP are disabled. When MGTM
warm starts on the SRP, it reads the NVS
configuration and enables multicast
routing. When MLD and PIM have
completed graceful restart and the IPv6
route table multicast-view has
completed graceful restart, old mroutes
are deleted from the line module and
cache-misses to the SRP are enabled.
This triggers re-creation of mroutes and
establishes the current multicast
forwarding state.
Although cache-misses to the SRP
module are disabled, forwarding is
preserved for old multicast joins to
downstream routers and hosts. However,
forwarding for new multicast joins
requested by downstream routers and
hosts after SRP module switchover is
not provided until cache-misses are
re-enabled.
– IC MLD deletes its interface and
membership state on SRP failover
(controller down). As part of SRP warm
start, MLD interfaces are reconfigured
from NVS and dynamic IMLD interfaces
are reconfigured from mirrored storage.
MLD hosts are queried as IPv6 interfaces
come back, the join state is
re-established, and SC MLD state is
created. After the maximum query
response time (across all interfaces)
expires to allow hosts to re-establish join
state, MLD notifies MGTMv6 that
graceful restart is complete.
– Static recovery support only. For warm
start, PIM interfaces are reconfigured
from NVS and a Hello message with a
new Generation ID is issued as IPv6
interfaces come up. A neighbor that
receives this Hello determines that the
upstream neighbor has lost state and
needs to be refreshed. A VR-global
configurable graceful restart timer is
required for PIM to time out the
re-establishment of the join state for
sparse-mode interfaces. After this timer
expires, PIM notifies MGTM that graceful
restart is complete.
47