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Table 5: Application Support for Stateful SRP Switchover (continued)
Application
Supported
MLD
PIM
Multiprotocol
Label Switching
MPLS
BGP signaling
Chapter 3: Managing Stateful SRP Switchover
Unsupported
Notes
–
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.
–
MPLS is HA-unsafe during a graceful
restart. It is HA-unsafe until all the
configured MPLS signaling protocols
have completed their graceful restart
procedures and any stale forwarding
elements have been flushed from the
line modules.
If you force an SRP switchover while
MPLS is HA-unsafe, the SRP module
switches but the SRP module and the
line modules undergo a cold restart.
If the primary SRP module resets while
MPLS is HA-unsafe, the router undergoes
a cold restart.
MPLS over IPv6 supports HA. This
functionality enables BGP to support
graceful restart for IPv6 labeled
addresses.
–
Application Support for Stateful SRP Switchover
37
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