Chapter 51
| Multicast Routing Commands
PIM Multicast Routing
– 1218 –
PIM6-SM Commands
ipv6 pim
bsr-candidate
This command configures the switch as a Bootstrap Router (BSR) candidate. Use the
no form to restore the default value.
Syntax
ipv6 pim bsr-candidate interface vlan vlan-id [hash hash-mask-length]
[priority priority]
no ipv6 pim bsr-candidate
vlan-id - VLAN ID (Range: 1-4094)
hash-mask-length - Hash mask length (in bits) used for RP selection (see
ipv6 pim rp-candidate and ipv6 pim rp-address). The portion of the hash
specified by the mask length is ANDed with the group address. Therefore,
when the hash function is executed on any BSR, all groups with the same
seed hash will be mapped to the same RP. If the mask length is less than 32,
then only the first portion of the hash is used, and a single RP will be
defined for multiple groups. (Range: 0-32 bits)
priority - Priority used by the candidate bootstrap router in the election
process. The BSR candidate with the largest priority is preferred. If the
priority values are the same, the candidate with the larger IP address is
elected to be the BSR. Setting the priority to zero means that this router is
not eligible to server as the BSR. At least one router in the PIM6-SM domain
must be set to a value greater than zero. (Range: 0-255)
Default Setting
Hash Mask Length: 10
Priority: 0
Command Mode
Global Configuration
Command Usage
â—† When the ipv6 pim bsr-candidate command is entered, the router starts
sending bootstrap messages to all of its PIM6-SM neighbors. The IP address of
the designated VLAN is sent as the candidate’s BSR address. Each neighbor
receiving the bootstrap message compares the BSR address with the address
from previous messages. If the current address is the same or a higher address,
it accepts the bootstrap message and forwards it. Otherwise, it drops the
message.
â—† This router will continue to be the BSR until it receives a bootstrap message
from another candidate with a higher priority (or a higher IP address if the
priorities are the same).
â—† To improve failover recovery, it is advisable to select at least two core routers in
diverse locations, each to serve as both a candidate BSR and candidate RP. It is
also preferable to set up one of these routers as both the primary BSR and RP.
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