HP 3500YL - Manual (Page 140)

PIM-SM (Sparse Mode)
Configuring PIM-SM on the Router
Changing the Priority Setting for a BSR-Candidate Router.
Syntax: bsr-candidate priority < 0 - 255 >
[no] router pim bsr-candidate priority < 0 - 255 >
Specifies the priority to apply to the router when a BSR
election process occurs in the PIM-SM domain. The candidate
with the highest priority becomes the BSR for the domain. If
the highest priority is shared by multiple routers, then the
candidate having highest IP address becomes the domain’s
BSR. Zero (0) is the lowest priority. To make BSR selection
easily predictable, use this command to assign a different
priority to each candidate BSR in the PIM-SM domain.
(Default: 0; Range 0 - 255.)
Note: Disabling PIM-SM on the elected BSR or disabling the
C-BSR functionality on the elected BSR causes the router to
send a bootstrap message (BSM) with a priority setting of
0
(zero) to trigger a new BSR election. If all BSRs in the domain
are set to the
0 (default) priority, then the election will fail
because the result would be to re-elect the BSR that has become
unavailable. For this reason, it is recommended that all C-
BSRs in the domain be configured with a
bsr-candidate priority
greater than 0.
Changing the Distribution of Multicast Groups Across a Domain.
Syntax: bsr-candidate hash-mask-length < 1 - 32 >
[no] router pim bsr-candidate hash-mask-length < 1 - 32 >
Controls distribution of multicast groups among the
candidate RPs in a domain where there is overlapping
coverage of the groups among the RPs. This value specifies the
length (number of significant bits) taken into account when
allocating this distribution. A longer hash-mask-length
results in fewer multicast groups in each block of group
addresses assigned to the various RPs. Because multiple
blocks of addresses are typically assigned to each candidate
RP, this results in a wider dispersal of addresses and enhances
load-sharing of the multicast traffic of different groups being
used in the domain at the same time.
(Default: 30; Range: 1 - 32.)
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