Operating rules and recommendations – HP 3500YL User Manual
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PIM-SM (Sparse Mode)
Operating Rules and Recommendations
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Static-RPs are not included in the RP-set messages generated by the BSR,
and do not generate advertisements.
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If a static-RP becomes unavailable, it is necessary to remove and/or
replace the configuration for this RP in all routers in the domain.
Configuration.
Refer to “Statically Configuring an RP To Accept Multicast
Operating Rules and Recommendations
Guideline for Configuring Candidate RPs and BSRs.
Routers in a PIM
SM domain should usually be configured as both candidate RPs and candidate
BSRs. Doing so can reduce some overhead traffic.
The Shortest-Path-Tree (SPT) Policy Should Be the Same for All RPs
in a Domain.
Allowing some RPs to remain configured to implement SPTs
while configuring other RPs in the same domain to force RPT use can result
in unstable traffic flows. (Use the
[ no ] ip pim-sparse spt-threshold command to
change between SPT and RPT operation on each router.)
Application of RPs to Multicast Groups.
In a PIM-SM domain, a given
multicast group or range of groups can be supported by only one RP. (Typically,
multiple candidate RPs in a domain are configured with overlapping coverage
of multicast groups, but only one such candidate will be elected to support a
given group.)
Ensuring that the Candidate RPs in a PIM-SM Domain Cover All
Desired Multicast Groups.
All of the multicast groups you want to allow
in a given PIM-SM domain must be included in the aggregate of the multicast
groups configured in the domain’s candidate RPs. In most cases, all C-RPs in
a domain should be configured to support all RP groups (the default configu
ration for a router enabled as a C-RP). This provides redundancy in case an
RP becomes unavailable. (If the C-RP supporting a particular multicast group
becomes unavailable, another C-RP is elected to support the group as long as
there is redundancy in the C-RP configuration for multiple routers. Note that
in cases where routers are statically configured to support a specific group or
range of groups, the C-RP prioritization mechanism allows for redundant
support.
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