Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - SERVICE AVAILABILITY CONFIGURATION GUIDE 2010-10-08 Configuration Manual page 68

JunosE 11.3.x Service Availability Configuration Guide
46
Table 8: Application Support for Stateful SRP Switchover (continued)
Application Supported
MGTM
PIM
IPv6 Multicast
Routing
Multicast Routing
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 IGMP, DVMRP, and PIM
have completed graceful restart and the
IP 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.
– Static recovery support only. For warm
start, PIM interfaces are reconfigured
from NVS. A Hello message with a new
Generation ID is issued as IP 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.
– Stateful SRP switchover. During
switchover, the system mirrors the
multicast queue so that IP can use the
same queue without needing to recreate
a different connection. The multicast
queues are also preserved during the
switchover and graceful restart period
to ensure that multicast data continues
to be forwarded using the previously
learned multicast forwarding state.
Copyright © 2010, Juniper Networks, Inc.