C
HAPTER
46
| Multicast Routing Commands
PIM Multicast Routing
– 1101 –
timing out by periodically forwarding a control message down the
distribution tree, refreshing the prune state on the outgoing interfaces
of each router in the tree. This also enables PIM routers to recognize
topology changes (sources joining or leaving a multicast group) before
the default three-minute state timeout expires.
â—† This command is only effectively for interfaces of first hop, PIM-DM
routers that are directly connected to the sources of multicast groups.
EXAMPLE
Console(config-if)#ip pim state-refresh origination-interval 30
Console(config-if)#
ip pim bsr-candidate This command configures the switch as a Bootstrap Router (BSR)
candidate. Use the no form to restore the default value.
SYNTAX
ip pim bsr-candidate interface vlan vlan-id
[hash hash-mask-length] [priority priority]
no ip pim bsr-candidate
vlan-id - VLAN ID (Range: 1-4094)
hash-mask-length - Hash mask length (in bits) used for RP selection
(see ip pim rp-candidate and ip 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 PIM-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 ip pim bsr-candidate command is entered, the router
starts sending bootstrap messages to all of its PIM-SM neighbors. The
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