Chapter 51
| Multicast Routing Commands
PIM Multicast Routing
– 1199 –
ip pim rp-candidate This command configures the router to advertise itself as a Rendezvous Point (RP)
candidate to the bootstrap router (BSR). Use the no form to remove this router as
an RP candidate.
Syntax
ip pim rp-candidate interface vlan vlan-id [group-prefix group-address mask]
[interval seconds] [priority value]
no ip pim rp-candidate interface vlan vlan-id
vlan-id - VLAN ID (Range: 1-4094)
group-address - An IP multicast group address. If a group address is not
specified, the RP is advertised for all multicast groups.
mask - Subnet mask that is used for the group address.
seconds - The interval at which this device advertises itself as an RP
candidate. (Range: 60-16383 seconds)
value - Priority used by the candidate RP in the election process. The RP
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 RP.
Setting the priority to zero means that this router is not eligible to server as
the RP. (Range: 0-255)
Default Setting
Address: 224.0.0.0/4, or the entire IPv4 multicast group family
Interval: 60 seconds
Priority: 0
Command Mode
Global Configuration
Command Usage
â—† When the ip pim rp-candidate command is entered, the router periodically
sends PIMv2 messages to the BSR advertising itself as a candidate RP for the
specified group addresses. The IP address of the designated VLAN is sent as the
candidate’s RP address. The BSR places information about all of the candidate
RPs in subsequent bootstrap messages. The BSR uses the RP-election hash
algorithm to select an active RP for each group range. The election process is
performed by the BSR only for its own use. Each PIM-SM router that receives the
list of RP candidates from the BSR also elects an active RP for each group range
using the same election process.
â—† The election process for each group is based on the following criteria:
â–
Find all RPs with the most specific group range.
â–
Select those with the highest priority (lowest priority value).
â–
Compute a hash value based on the group address, RP address, priority,
and hash mask included in the bootstrap messages.
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