Cisco CRS Series - Multicast IRB; Restrictions; Supported Bridge Port Types; Multicast Source Discovery Protocol

BV interfaces are added to the existing VRF routes and integrated with the replication slot mask. After this
integration, the traffic coming from a VRF BVI is forwarded to the VPN.
Supported bridge port types
•
Bundles
•
Satellites
•
EFPs (physical, vlans, etc)
•
Pseudowires
Restrictions
•
Supported only on Ethernet line cards and enhanced ethernet line cards.
•
Support only for IPv4
•
Supports IGMP snooping
Multicast IRB
The CE-PE is collapsed into 1 router (IRB) and IGMP snooping is enabled on the BVIs.
BVI type is included in a multicast VRF. After the BVI slot mask is included in the VRF route slot mask, the
traffic from the VRF BVI is forwarded to the VPN/ core.
Multicast Source Discovery Protocol
Multicast Source Discovery Protocol (MSDP) is a mechanism to connect multiple PIM sparse-mode domains.
MSDP allows multicast sources for a group to be known to all rendezvous points (RPs) in different domains.
Each PIM-SM domain uses its own RPs and need not depend on RPs in other domains.
An RP in a PIM-SM domain has MSDP peering relationships with MSDP-enabled routers in other domains.
Each peering relationship occurs over a TCP connection, which is maintained by the underlying routing
system.
MSDP speakers exchange messages called Source Active (SA) messages. When an RP learns about a local
active source, typically through a PIM register message, the MSDP process encapsulates the register in an
SA message and forwards the information to its peers. The message contains the source and group information
for the multicast flow, as well as any encapsulated data. If a neighboring RP has local joiners for the multicast
group, the RP installs the S, G route, forwards the encapsulated data contained in the SA message, and sends
PIM joins back towards the source. This process describes how a multicast path can be built between domains.
Although you should configure BGP or Multiprotocol BGP for optimal MSDP interdomain operation,
this is not considered necessary in the Cisco IOS XR Software implementation. For information about
how BGP or Multiprotocol BGP may be used with MSDP, see the MSDP RPF rules listed in the Multicast
Source Discovery Protocol (MSDP), Internet Engineering Task Force (IETF) Internet draft.
Note
Cisco IOS XR Multicast Configuration Guide for the Cisco CRS Router, Release 5.2.x
64
Implementing Multicast Routing on Cisco IOS XR Software
Multicast Source Discovery Protocol