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Anycast RP
Using MSDP, anycast RP provides load sharing and redundancy in PIM-SM networks. Anycast RP allows two
or more rendezvous points (RPs) to share the load for source registration and the ability to act as hot backup
routers for each other.
Anycast RP allows you to configure two or more RPs with the same IP address on Loopback interfaces. The
Anycast RP Loopback address are configured with a 32-bit mask, making it a host address. All downstream
routers are configured to know that the Anycast RP Loopback address is the IP address of their local RP. IP
routing automatically selects the closest RP for each source and receiver. Assuming that the sources are
evenly spaced around the network, an equal number of sources register with each RP. Consequently, all the
RPs in the network share the process of registering the sources equally. Because a source may register with
one RP and receivers may join to a different RP, a method is needed for the RPs to exchange information
about active sources. This information exchange is done with MSDP.
With Anycast RP, all the RPs are configured to be MSDP peers of each other. When a source registers with
one RP, an SA message is sent to the other RPs informing them that there is an active source for a particular
multicast group. The result is that each RP is aware of the active sources in the area of the other RPs. If any of
the RPs fail, IP routing converges and one of the RPs becomes the active RP in more than one area. New
sources register with the backup RP. Receivers join toward the new RP and connectivity is maintained.
Implementation Information
The Dell Networking OS implementation of MSDP is in accordance with RFC 3618 and Anycast RP is in
accordance with RFC 3446.
Configure Multicast Source Discovery
Protocol
Configuring MSDP is a four-step process.
1
Enable an exterior gateway protocol (EGP) with at least two routing domains.
Refer to the following figures.
The
MSDP Sample Configurations
Also, refer to
Open Shortest Path First (OSPFv2)
2
Configure PIM-SM within each EGP routing domain.
Refer to the following figures.
The
MSDP Sample Configurations
PIM Sparse-Mode
3
Enable
MSDP.
4
Peer the RPs in each routing domain with each other. Refer to
show the OSPF-BGP configuration used in this chapter for MSDP.
show the PIM-SM configuration in this chapter for MSDP. Also, refer to
(PIM-SM).
and
Border Gateway Protocol IPv4
Enable
MSDP.
Multicast Source Discovery Protocol (MSDP)
(BGPv4).
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Troubleshooting
