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JUNOSe 11.1.x Service Availability Configuration Guide
Table 5: Application Support for Stateful SRP Switchover (continued)
36
Application Support for Stateful SRP Switchover
Application
Supported
PIM
IPv6 Multicast
Routing
Multicast Routing
MGTM
Unsupported
Notes
–
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.
–
Static recovery support only. During
switchover, the system mirrors the
multicast queue so that IPv6 can use the
same queue without needing to re-create
a different connection.
–
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.
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