KB.15.15

Statically configuring an RP to accept multicast traffic

A given static RP entry should be manually configured on all routers in the PIM-SM domain.

Syntax:

router pim rp-address [rp-ip-addr] [group-addr/group-mask]

[override]

[no] router pim rp-address [rp-ip-addr][group-addr/group-mask]

[overide]

[rp-ip-addr] Statically specifies the IP address of the

interface to use as an RP. Up to eight static RP

IP addresses can be configured. (Each address

can be entered multiple times for different

multicast groups or group ranges.)

[group-addr/group-mask] Specifies the multicast group or range of

contiguous groups supported by the statically

configured RP. Up to eight multicast group

ranges can be configured.

[override] Where a static RP and a C-RP are configured

to support the same multicast group(s) and the

multicast group mask for the static RP is equal

to or greater than the same mask for the

applicable C-RPs, this command assigns the

higher precedence to the static RP, resulting

in the C-RP operating only as a backup RP for

the configured group. Without override, the

C-RP has precedence over a static RP

configured for the same multicast group(s.)

Configuring PIM-SM support in the router PIM context

This example assumes the following:

• IP routing, IP multicast routing, and at least one routing method (RIP, OSPF, and/or static IP

routes) are already configured in the global configuration context.

• An IP routing method (RIP or OSPF) and PIM-sparse are already configured in the static VLAN

context on which you want to support PIM-SM operation.

NOTE: Routers configured for C-RP operation can also be configured for C-BSR operation.

Use of static RP operation must be identically configured on all PIM-SM routers in the domain.

Figure 15 (page 78) illustrates the following configuration steps for the router PIM context:

• Enabling BSR operation on the router, including specifying a source IP address.

• Enabling C-RP operation on the router.

• Replacing the default multicast group range (all) with a smaller range (231.128.24.0/18)

and a single group address (230.255.1.1/32.)

• Enabling static RP with an override on this router for a single group address

(231.128.64.255/32) within the range of the C-RP support for the 231.128.24.0 group.

• Leaving the other router PIM fields in their default settings.

Statically configuring an RP to accept multicast traffic 77