Cisco ASR 9000 Series Software Manual page 43

Implementing Layer-3 Multicast Routing on Cisco IOS XR Software
PIM Registration
PIM registration packets can be forwarded on a unicast GRE tunnel as long as the IPv4 unicast GRE interface
is selected by FIB for unicast forwarding of the encapsulated PIM registration packets toward the PIM RP.
In this case, the packet is essentially double encapsulated with unicast, ie, the original multicast packet is
encapsulated by PIM in a unicast PIM register packet. This is then encapsulated with the unicast GRE tunnel
header.
At the PIM RP, outermost unicast header will be removed and the PIM registration packets will be delivered
to PIM via LPTS as in the current PIM registration packet processing. It is advisable to avoid any MTU/TTL
or ACL/QoS configuration issues that result in the registration packets getting dropped.
Auto-RP
Auto-RP lite on PEs, Auto-RP/BSR/static-RP/ Anycast-RP with MSDP peering etc can be supported over
GRE tunnels with MFIB netio chain support. It is advisable to avoid any MTU/TTL or ACL/QoS configuration
issues that result in the registration packets getting dropped. Auto-RP routes will flood autp-rp packets to
every multicast egress interface including IPv4 unicast GRE tunnels.
Multicast IRB
Multicast IRB provides the ability to route multicast packets between a bridge group and a routed interface
using a bridge-group virtual interface (BVI). It can be enabled with multicast-routing. THE BVI is a virtual
interface within the router that acts like a normal routed interface. For details about BVI, refer Cisco ASR 9000
Series Aggregation Services Router Interface and Hardware Component Configuration Guide
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
Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.1.x
Multicast IRB
43