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3<br />
MSDP Anycast RP<br />
Syntax: [no] mesh-group group-name peer-address<br />
The sample configuration above reflects the configuration in Figure 7. On RP 206.251.21.31 you<br />
specify its peers within the same domain (206.251.18.31, 206.251.19.31, and 206.251.20.31).<br />
You first configure the MSDP peers using the msdp-peer command to assign their IP addresses<br />
and the loopback interfaces.<br />
Next, place the MSDP peers within a domain into a mesh group. Use the mesh-group command.<br />
There are no default mesh groups.<br />
The group-name parameter identifies the mesh group. Enter up to 31 characters for group-name.<br />
You can have up to 4 mesh groups within a multicast network. Each mesh group can include up to<br />
15 peers.<br />
The peer-address parameter specifies the IP address of the MSDP peer that is being placed in the<br />
mesh group. Each mesh group can include up to 32 peers.<br />
NOTE<br />
On each of the device that will be part of the mesh group, there must be a mesh group definition for<br />
all the peers in the mesh-group.<br />
A maximum of 32 MSDP peers can be configured per mesh group.<br />
MSDP Anycast RP<br />
MSDP Anycast RP is a method of providing intra-domain redundancy and load-balancing between<br />
multiple Rendezvous Points (RP) in a Protocol Independent Multicast Sparse mode (PIM-SM)<br />
network. It is accomplished by configuring all RPs within a domain with the same anycast RP<br />
address which is typically a loopback IP address. Multicast Source Discovery Protocol (MSDP) is<br />
used between all of the RPs in a mesh configuration to keep all RPs in sync regarding the active<br />
sources.<br />
PIM-SM routers are configured to register (statically or dynamically) with the RP using the same<br />
anycast RP address. Since multiple RPs have the same anycast address, an Interior Gateway<br />
Protocol (IGP) such as OSPF routes the PIM-SM router to the RP with the best route. If the PIM-SM<br />
routers are distributed evenly throughout the domain, the loads on RPs within the domain will be<br />
distributed. If the RP with the best route goes out of service, the PIM-SM router’s IGP changes the<br />
route to the closest operating RP that has the same anycast address.<br />
This configuration works because MSDP is configured between all of the RPs in the domain.<br />
Consequently, all of the RPs share information about active sources.<br />
This feature uses functionality that is already available on the <strong>Brocade</strong> device but re-purposes it to<br />
provide the benefits desired as described in RFC 3446.<br />
Configuring MSDP Anycast RP<br />
To configure MSDP Anycast RP, you must perform the following tasks:<br />
• Configure a loopback interface with the anycast RP address on each of the RPs within the<br />
domain and enable PIM-SM on these interfaces.<br />
• Ensure that the anycast RP address is leaked into the IGP domain. This is typically done by<br />
enabling the IGP on the loopback interface (in passive mode) or redistributing the connected<br />
loopback IP address into the IGP.<br />
126 FastIron Ethernet Switch IP Multicast Configuration Guide<br />
53-1002638-02