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Configuring PIM Configuring PIM
page 7-24 OmniSwitch 6800/6850/9000 Advanced Routing Configuration Guide December 2007
PIM Bootstrap and RP Discovery
Before configuring PIM-SM parameters, please consider the following important guidelines.
For correct operation, every PIM-SM router within a PIM-SM domain must be able to map a particular
multicast group address to the same Rendezvous Point (RP). Otherwise, some receivers in the domain will
not receive some groups. Two mechanisms are supported for multicast group address mapping:
• Bootstrap Router (BSR) Mechanism
• Static RP Configuration
The chosen multicast group address mapping mechanism should be used consistently throughout PIM-SM
domain. Any RP address configured or learned must be a domain-wide reachable address.
Configuring a C-RP
Note. If you attempt to configure an interface that is not PIM enabled as a C-RP, you will receive the
following error message:
ERROR: PIM is not enabled on this Interface
For information on enabling PIM on an interface, refer to page 7-20.
To configure the local router as the Candidate-Rendezvous Point (C-RP) for a specified IP multicast
group(s), use the ip pim candidate-rp command. For example:
-> ip pim candidate-rp 50.1.1.1 224.16.1.1/32 priority 100 interval 100
This configures the switch to advertise the address 50.1.1.1 as the C-RP for the multicast group 224.16.1.1
with a mask of 255.255.255.255, priority level for this entry to be 100, and the interval at which the C-RP
advertisements are sent to the Bootstrap Router as 100.
Use the no form of this command to remove the association of the device as a C-RP for a particular multi-
cast group.
-> no ip pim candidate-rp 50.1.1.1 224.16.1.1/32
If a C-RP address is defined on the switch and no explicit entries are defined, then the switch will adver-
tise itself as a C-RP for all multicast groups (i.e., 224.0.0.0 with a mask of 240.0.0.0). If no C-RP address
is defined, the switch will not advertise itself as a C-RP for any groups. Only one RP address is supported
per switch. If multiple candidate-RP entries are defined, they must use the same rp-address.
The C-RP priority is used by a Designated Router in determining the RP for a particular group. The prior-
ity level may range from 0 to 192. The lower the numerical value, the higher the priority. The default
priority level for a C-RP is 0 (highest). If two or more C-RPs have the same priority value and the same
hash value, the C-RP with the highest IP address is selected by the DR.
Verifying C-RP Configuration
Check C-RP address, priority level, and explicit multicast group information using the show ip pim candi-
date-rp command, as follows:
-> show ip pim candidate-rp
RP Address Group Address Priority Interval Status
------------------+---------------+---------+---------+--------
172.21.63.11 224.0.0.0/4 192 60 enabled