Configuring PIM
Configuring PIM
page 6-24
OmniSwitch AOS Release 7 Advanced Routing Configuration Guide
March 2011
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 6-20
.
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, set the priority level for this entry to 100, and set the interval at which the
C-RP advertisements are sent to the Bootstrap Router to 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 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 to determine the RP for a particular group. As per the C-
RP priority range, the lower the numerical value, the higher the priority.
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 the C-RP address, priority level, and explicit multicast group information using the
show ip pim
candidate-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