User guide

Configuring PIM Configuring PIM

OmniSwitch AOS Release 7 Advanced Routing Configuration Guide March 2015 page 7-25

The group address is listed as 225.0.0.0. The class D group mask (255.255.255.255) has been translated

into the Classless Inter-Domain Routing (CIDR) prefix length of /4. The C-RP is listed as 172.21.63.11.

The status is enabled.

Specifying the Maximum Number of RPs

You can specify the maximum number of RPs allowed in a PIM-SM domain.

Important. PIM must be globally disabled on the switch before changing the maximum number of

RPs. To disable PIM, use the ip pim sparse admin-state command. See “Disabling PIM Mode on the

Switch” on page 7-21 for more information.

To specify a maximum number of RPs, use the ip pim max-rps command. For example:

-> ip pim max-rps 12

Note. This command is used with both IPv4 and IPv6 PIM-SM. PIM-SM must be disabled before chang-

ing max-rps value.

Verifying Maximum-RP Configuration

Check the maximum number of RPs using the show ip pim sparse command. For example:

-> show ip pim sparse

Status = enabled,

Keepalive Period = 210,

Max RPs = 32,

Probe Time = 5,

RP Threshold = 1,

SPT Status = enabled,

For more information about these displays, see the “PIM Commands” chapter in the OmniSwitch AOS

Release 7 CLI Reference Guide.

Candidate Bootstrap Routers (C-BSRs)

A Candidate Bootstrap Router (C-BSR) is a PIM-SM-enabled router that is eligible for Bootstrap Router

(BSR) status. To become a BSR, a C-BSR must be elected. A C-BSR sends Bootstrap messages to all

neighboring routers. The messages include its IP address—which is used as an identifier—and its priority

level. The C-BSR with the highest priority level is elected as the BSR by its neighboring routers. If there

are multiple C-BSRs with the same highest priority, the C-BSR with the highest IP address will become

the BSR.

For information on configuring a C-BSR, refer to “Configuring a C-BSR” below.