MSDP
- Link multicast domains via RPs
- Provide Redundant RPs via Anycast RP
A source turns on, and when the first RP finds out about it, it notifies other RPs.
Details
- RPs register to each other, in different multicast domains
- RP sends a SA (source active) message
- Still needs PIM running for the
S,G - TCP port 639
- Has keepalives
Startup
-
Multicast source starts up.
-
FHR router sends a register message to the closest RP.
-
RP registers this as a SA (Source Active).
-
Sends Source Active Messages to other RPs
(*,G) means there is an interested receiver.
Config
!
! RP1
!
int lo0
description "Only used for Anycast RP"
ip address 10.0.0.1 255.255.255.255
!
int lo1
ip add 10.1.1.1 255.255.255.255
!
ip msdp peer 10.1.1.2 connect-source loopback 1
ip msdp originator-id loopback 1
ip pim rp-address 10.0.0.1
!
! RP2
!
int lo 0
description "Only used for Anycast RP"
ip address 10.0.0.1 255.255.255.255
!
int lo1
ip address 10.1.1.2 255.255.255.255
!
ip msdp peer 10.1.1.1 connect-source lo1
ip msdp originator-id loopback 1
ip pim rp-address 10.0.0.1
Commands
show ip msdp peer
show ip msdp sa-cache
References
RFC 4611 - Multicast Source Discovery Protocol (MSDP) Deployment Scenarios