To Next Page

To Previous Page

193

Because the SA message is from an MSDP peer—RP 2—in the same AS, and the MSDP peer is the

next hop on the optimal path to the source-side RP, RP 3 accepts the message and forwards it to

other peers—RP 4 and RP 5.

3. When RP 4 and RP 5 receive the SA message from RP 3:

Because the SA message is from an MSDP peer—RP 3—in the same mesh group, RP 4 and RP 5

both accept the SA message, but they do not forward the message to other members in the mesh

group. Instead, they forward it to other MSDP peers—RP 6 in this example—out of the mesh group.

4. When RP 6 receives the SA messages from RP 4 and RP 5—suppose RP 5 has a higher IP address:

Although RP 4 and RP 5 are in the same AS—AS 3—and both are MSDP peers of RP 6, because

RP 5 has a higher IP address, RP 6 accepts only the SA message from RP 5.

5. When RP 7 receives the SA message from RP 6:

Because the SA message is from a static RPF peer—RP 6, RP 7 accepts the SA message and

forwards it to other peer—RP 8.

6. When RP 8 receives the SA message from RP 7:

A BGP or MBGP route exists between two MSDP peers in different ASs. Because the SA message is

from an MSDP peer—RP 7—in a different AS, and the MSDP peer is the next hop on the BGP or

MBGP route to the source-side RP, RP 8 accepts the message and forwards it to its other peer—RP

7. When RP 9 receives the SA message from RP 8:

Because RP 9 has only one MSDP peer, RP 9 accepts the SA message.

SA messages from paths other than those described previously are not accepted or forwarded by MSDP

peers.

Implementing intra-domain Anycast RP by leveraging MSDP peers

Anycast RP refers to an application that enables load balancing and redundancy backup between two

or more RPs within a PIM-SM domain by configuring the same IP address for, and establishing MSDP

peering relationships between, these RPs.

As shown in Figure 57, within a PIM-SM domain, a

multicast source sends multicast data to multicast

group G, and Receiver is a member of the multicast group. To implement Anycast RP, configure the

same IP address—known as “Anycast RP address”, typically a private address—on Router A and Router

B, configure these interfaces as C-RPs, and establish an MSDP peering relationship between Router A

and Router B.

NOTE:

Usually an Anycast RP address is configured on a logic interface, like a loopback interface.

Questions and Answers:

Need help?

Do you have a question about the HP A5500 SI Switch Series and is the answer not in the manual?

HP A5500 SI Switch Series Specifications

General