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Configuring BSR and RP Candidates for PIM Sparse Mode
When choosing candidate BSRs or candidate RPs,
select well-connected routers in the core of the network.
Typically, candidate BSRs are a subset of the candidate
RPs. A single BSR is elected for the domain the set of candidate BSRs.
The elected BSR floods bootstrap messages (BSMs) containing their
group-to-RP mappings to all PIM routers. PIM routers use the group-to-RP
mappings supplied by the elected (or preferred) BSR.
Candidate RPs are routers that are capable of performing
as a rendezvous point router for one or more multicast groups. Candidate
RPs periodically advertise the set of groups they support to BSRs.
A candidate RP may support all the multicast group address range or
any subset thereof. You can achieve redundancy by configuring more
than one candidate RP for a group or range of groups.
ipv6
pim bsr-candidate
- Use to define a router as a BSR candidate.
- To assign an interface from which the router should send
messages, specify an interface type and specifier, such as atm 3/0.
For details about interface types and specifiers, see Interface Types and Specifiers.
- Specify a length (up to a 128 bits) for the hash mask
length field sent in BSMs that the router originates. This mask is
combined with the group address before the router calls the hash function.
For example, specifying a value of 32 limits the group address to
the first 32 bits. The default and maximum hash mask length is 126
bits.
- Use the priority keyword to
specify a value for the BSR-priority field of BSMs that the router
originates. In the BSR election process, the BSR with the higher priority
is preferred. If the priority values are equal, the router with the
higher IP address becomes the BSR. The default value is 0 (address
comparison only).
- Use the period keyword to specify
the interval (from 1 to 65535 seconds) at which the BSR sends bootstrap
messages. The default value is 60 seconds.
- Example
- host1(config)#ipv6 pim bsr-candidate loopback
1 30 10
- Use the no version to stop
the router from acting as a BSR candidate.
- See ipv6 pim bsr-candidate.
ipv6
pim rp-candidate
- Use to define a router as an RP router candidate.
- To assign an interface from which the router should send
messages, specify an interface type and specifier, such as atm 3/0.
For details about interface types and specifiers, see Interface Types and Specifiers.
- Use the group-list keyword
to specify an access list that contains the set of group prefixes
supported by this candidate RP. If you do not specify a group list,
the default is the entire multicast address range.
 |
Note:
You should not configure negative (that is, deny) access-list
entries. BSR has no mechanism for distributing negative entries.
|
- Use the hold-time keyword to
specify the amount of time the BSR keeps an RP in its candidate RP
list if the BSR does not receive a candidate RP advertisement message.
The default value is 150 seconds.
- Use the priority keyword to
specify a priority field value that the candidate RP sends to the
BSR in candidate RP advertisement messages. In the RP election process,
the RP with the lower priority value is preferred. The default is
192.
- Use the interval keyword to
specify an interval (from 1 to 65535 seconds) at which the candidate
RP sends advertisement messages to the BSR. The default is 60 seconds.
- Example
- host1(config)#access-list 1 permit 1001::1
- host1(config)#access-list 1 permit 1002::1
- host1(config)#ipv6 pim rp-candidate loopback
1 group-list 1
- Use the no version to stop
the router from acting as an RP candidate.
- See ipv6 pim rp-candidate.
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