User Manual UMN:CLI
V5808
455
9.3.3.2 Bootstrap Router
The bootstrap router (BSR) mechanism is one way that a multicast router can learn the
set of group-to-RP mappings required in order to function.
All multicast routers in PIM-SM domain can be potentially the bootstrap router (BSR);
they are all considered as candidate BSRs. To elect the BSR among the candidate BSRs,
each candidate BSR floods the bootstrap messages with its information to the domain.
When receiving the bootstrap messages, the candidate BSRs examine the messages,
and then the one with the highest priority is elected as the BSR. If more than one
candidate with the same highest priority, the one with the higher IP address is elected.
The elected BSR is responsible to periodically send out bootstrap messages including the
RP-set, allowing all the routers in the PIM-SM domain determine which router is the RP
that covers given multicast groups.
Interface for Candidate BSR
To configure an interface to flood the candidate BSR advertisement, use the following
command.
ip pim bsr-candidate
INTERFACE
Configures an interface to flood the candidate BSR
advertisement.
INTERFACE: interface name
0-32: hash mask length for RP selection
0-255: priority for candidate BSR
ip pim bsr-candidate
INTERFACE <0-32>
ip pim bsr-candidate
INTERFACE <0-32> <0-255>
Configures an interface not to flood the candidate BSR
advertisement.
Clearing RP-Set
The BSR periodically distributes the bootstrap message that includes a set of the
information received from each candidate RP (RP-set) to all the routers in the PIM-SM
domain. You can also clear all RP-set to reset. To clear all RP-set, use the following
command.
clear ip pim sparse-mode bsr rp-
set *
Displaying BSR Configuration
To display the BSR information, use the following command.
Shows the BSR information.
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