Brocade Multi-Service IronWare Multicast Configuration Guide (Supporting R05.6.00) - Manual (Page 97)

Multi-Service IronWare Multicast Configuration Guide 85
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MSDP Anycast RP
1
The sample configuration above reflects the configuration in Figure 10 . 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-peer command to assign their IP addresses
and the loopback interfaces.
Next, place the MSDP peers within a domain into a mesh group. Use the mesh-group command.
There are no default mesh groups.
The group-name parameter 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-address parameter specifies the IP address of the MSDP peer that is being placed in the
mesh group.
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 15 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.