Create Multicast Boundaries And Domains; Pim-Sm Graceful Restart - Dell Force10 S4810P Configuration Manual

Create Multicast Boundaries and Domains

A PIM domain is a contiguous set of routers that all implement PIM and are configured to operate within a
common boundary defined by PIM Multicast Border Routers (PMBRs). PMBRs connect each PIM
domain to the rest of the internet.
Create multicast boundaries and domains by filtering inbound and outbound Bootstrap Router (BSR)
messages per interface, use the
inbound and outbound updates. Already existing BSR advertisements are removed by timeout.
Remove candidate RP advertisements using the

PIM-SM Graceful Restart

PIM-SM Graceful Restart
PIM-SM Graceful Restart
When a PIM neighbor restarts and the liveliness timer for that neighbor expires, the join/prune states
received from the neighbor expire, and the corresponding interfaces are removed from the outgoing list of
multicast entries. The effect of this is that active multicast sessions are brought down.
FTOS supports PIM-SM graceful restart based on the GenID. Per RFC 4601, hello messages should
contain a Generation_Identifier option, which contains a randomly generated value (GenID) that is
regenerated each time PIM forwarding is started or restarted on the interface, including when the router
restarts. When a router receives from a neighbor a hello message with a new GenID, any old hello
information about that neighbor should be discarded and superseded by the information from the new hello
message.
FTOS supports graceful restart based on the GenID. A Dell Force10 PIM router announces its graceful
restart capability to its neighbors up front as an option in its hello messages.
If a graceful-restart capable router recognizes that a graceful-restart capable neighbor has restarted, it
preserves the state from the neighbor and continues forwarding multicast traffic while the neighbor
restarts.
• The router holds on to the entries learned from the neighbor for the graceful restart interval. If it does
not receive a hello from the neighbor within this time, it purges all state associated with the neighbor.
• If the neighbor restarts and sends a hello with a new GenID before this interval expires, the router
sends a join message towards the neighbor for the relevant entries.
If a graceful-restart capable router restarts, the router preserves all multicast entries in hardware until it
receives and consolidates joins from its graceful-restart capable neighbors. The router is not taken off the
forwarding path during restart.
784
| PIM Sparse-Mode (PIM-SM)
command. This command is applied to the subsequent
ip pim bsr-border
clear ip pim rp-mapping
is supported only on platform
is supported only on platform
command.
e
e
x with FTOS 8.2.1.0 and later.