Configuration Guide User guide

1540 FastIron Configuration Guide
53-1002494-02
PIM Sparse
Displaying the static RP
Use the show ip pim rp-set command to display static RP and the associated group ranges.
Brocade(config)# show ip pim rp-set
Static RP and associated group ranges
-------------------------------------
Static RP count: 4
130.1.1.1
120.1.1.1
120.2.1.1
124.1.1.1
Number of group prefixes Learnt from BSR: 0
No RP-Set present.
Use the show ip pim rp-map command to display all current multicast group addresses to RP
address mapping.
Brocade(config)# show ip pim rp-map
Number of group-to-RP mappings: 5
Group address RP address
----------------------------------------
1 230.0.0.1 100.1.1.1
2 230.0.0.2 100.1.1.1
3 230.0.0.3 100.1.1.1
4 230.0.0.4 100.1.1.1
5 230.0.0.5 100.1.1.1
Anycast RP
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 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.
Configuring Anycast RP
To configure Anycast RP, you must do the following:
• 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.