Cisco Catalyst 6880-X Specifications download pdf (Page 75)

Distribution Layer April 2014

Procedure 6 Configure IP Multicast RP

(Optional)

In networks without a core layer, the RP function can be placed on the distribution layer. If a core layer does

exist, follow the IP Multicast Procedure 4 in the core layer section to configure the RP function.

Every Layer 3 switch and router must know the address of the IP Multicast RP, including the core switches that

are serving as the RP. This design uses AutoRP to announce candidate RPs, which are the core switches, to the

rest of the network.

Step 1: Configure loopback interface for RP.

Configure a second loopback interface to be used as the RP interface. The interface uses a host address mask

(32 bits). All routers then point to this common IP address on loopback 1 for the RP.

interface Loopback 1

ip address 10.4.15.253 255.255.255.255

ip pim sparse-mode

Although you could use an existing loopback interface, adding a new interface

increases the ability to rapidly adapt to future requirements which may drive a change

in the location of the RP.

For example, if your RP is currently configured on a distribution layer, you may want

to move the RP when you add a core. Configuring the RP address on the loopback

interface at the new location with the same IP address used on Loopback 1 in this

procedure and establishing IP Multicast and MSDP peering enables the migration. All

remote routers should still point to the same RP address, which simplifies the move

and reduces disruption to the IP Multicast environment.

Tech Tip

Step 2: Configure AutoRP candidate RP.

The send-rp-announce command in conjunction with the group-list option advertises the RP address, with the

multicast range the device is willing to serve, as a candidate RP to the AutoRP mapping agents.

access-list 10 permit 239.1.0.0 0.0.255.255

ip pim send-rp-announce Loopback 1 scope 32 group-list 10

Step 3: Configure AutoRP mapping agent.

The AutoRP mapping agent listens for candidate RPs and then advertises to the rest of the network the list of

available RPs. The send-rp-discovery command enables this switch to act as an AutoRP mapping agent.

ip pim send-rp-discovery Loopback0 scope 32

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Cisco Catalyst 6880-X Specifications Page 75