Brocade Communications Systems IPMC5000PEF manual Configuring Msdp Anycast RP

MSDP Anycast RP

Syntax: [no] mesh-group group-namepeer-address

The sample configuration above reflects the configuration in Figure 7 on page 136. On RP 206.251.21.31 you specify its peers within the same domain (206.251.18.31, 206.251.19.31, and 206.251.20.31).

You first configure the MSDP peers using the msdp-peercommand to assign their IP addresses and the loopback interfaces.

Next, place the MSDP peers within a domain into a mesh group. Use the mesh-groupcommand. There are no default mesh groups.

The group-nameparameter identifies the mesh group. Enter up to 31 characters for group-name. You can have up to 4 mesh groups within a multicast network. Each mesh group can include up to 15 peers.

The peer-addressparameter specifies the IP address of the MSDP peer that is being placed in the mesh group. Each mesh group can include up to 32 peers.

NOTE

On each of the device that will be part of the mesh group, there must be a mesh group definition for all the peers in the mesh-group.

A maximum of 32 MSDP peers can be configured per mesh group.

MSDP Anycast RP

MSDP Anycast RP is a method of providing intra-domain redundancy and load-balancing between multiple Rendezvous Points (RP) in a Protocol Independent Multicast Sparse mode (PIM-SM) network. It is accomplished by configuring all RPs within a domain with the same anycast RP address which is typically a loopback IP address. Multicast Source Discovery Protocol (MSDP) is used between all of the RPs in a mesh configuration to keep all RPs in sync regarding the active sources.

PIM-SM routers are configured to register (statically or dynamically) with the RP using the same anycast RP address. Since multiple RPs have the same anycast address, an Interior Gateway Protocol (IGP) such as OSPF routes the PIM-SM router to the RP with the best route. If the PIM-SM routers are distributed evenly throughout the domain, the loads on RPs within the domain will be distributed. If the RP with the best route goes out of service, the PIM-SM router’s IGP changes the route to the closest operating RP that has the same anycast address.

This configuration works because MSDP is configured between all of the RPs in the domain.

Consequently, all of the RPs share information about active sources.

This feature uses functionality that is already available on the Brocade device but re-purposes it to provide the benefits desired as described in RFC 3446.

Configuring MSDP Anycast RP

To configure MSDP Anycast RP, you must perform the following tasks:

•Configure a loopback interface with the anycast RP address on each of the RPs within the domain and enable PIM-SM on these interfaces.

•Ensure that the anycast RP address is leaked into the IGP domain. This is typically done by enabling the IGP on the loopback interface (in passive mode) or redistributing the connected loopback IP address into the IGP.

FastIron Ethernet Switch IP Multicast Configuration Guide	137
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