Juniper JUNOSE 11.1.X MULTICAST ROUTING, Руководство по настройке

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Configuring BSR and RP Candidates for PIM Sparse Mode
When choosing candidate BSRs, 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 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.
ip pim bsr-candidate
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Use to define a router as a BSR candidate.
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To assign an interface from which the router sends messages, specify an interface
type and specifier, such as atm 3/0. For details about interface types and
specifiers, see Interface Types and Specifiers in
JUNOSe Command Reference
Guide .
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Specify a length (up to 32 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 24 limits the
group address to the first 24 bits. The default hash mask length is 30 bits.
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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).
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Use the period keyword to specify the interval, in the range 1–65535 seconds,
at which the BSR sends bootstrap messages. The default value is 60 seconds.
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Example
host1(config)# ip pim bsr-candidate loopback 1 30 10
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Use the no version to stop the router from acting as a BSR candidate.
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See ip pim bsr-candidate.
ip pim rp-candidate
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Use to define a router as an RP candidate.
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To assign an interface from which the router sends messages, specify an interface
type and specifier, such as atm 3/0. For details about interface types and
specifiers, see Interface Types and Specifiers in
JUNOSe Command Reference
Guide .
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Use the group-list keyword to specify an access-list that contains the set of group
prefixes supported by this candidate RP (C-RP). If you do not specify a group-list,
the default is the entire multicast address range.
NOTE: Because BSR has no mechanism for distributing negative entries, you should
not configure negative access-list entries (also called deny access-list entries).
Configuring BSR and RP Candidates for PIM Sparse Mode
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Chapter 3: Configuring PIM for IPv4 Multicast