receiver-site
!
!
vrf <name>
address-family [ipv4| ipv6]
bgp auto-discovery [mldp | p2mp-te | ingress-replication]
receiver-site
!
!
!
•
RPF vector insertion in Global Table
Unified MPLS deployments, for example, UMMT or EPN model
face issues, where some of the PEs do not support the enhancement procedures. In this case, to retain
BGP-free core in the Ingress and Egress segments, the PEs send PIM Joins with RPF-proxy vector. To
interoperate in such scenarios, the XR border acts as a transit node for RPF vector. This can be used in
other cases of BGP-free core as well. The RPF-vector support is only for GTM and not for MVPNs
(Inter-AS Option B). Support is enabled for the RPF-vector address-family being same as the Multicast
Join address-family.
IOS-XR supports termination of RPF vectors as well as acts as a transit router for RPF
vector. The termination of RPF vectors was introduced from release 4.3.1, however, the
support for acting as a transit router existed in earlier releases as well.
Note
The configuration is as shown below:
router pim
address-family [ipv4|ipv6]
rpf-vector
!
!
PE-PE Ingress Replication
The ingress PE replicates a C-multicast data packet belonging to a particular MVPN and sends a copy to all
or a subset of the PEs that belong to the MVPN. A copy of the packet is tunneled to a remote PE over a Unicast
Tunnel to the remote PE.
IR-MDT represents a tunnel that uses IR as the forwarding method. It is usually, one IR-MDT per VRF, with
multiple labeled switch paths (LSP) under the tunnel.
When PIM learns of Joins over the MDT (using either PIM or BGP C-multicast Routing), it downloads IP
S,G routes to the VRF table in MRIB, with IR-MDT forwarding interfaces. Each IR-MDT forwarding interface
has a LSM-ID allocated by PIM. Currently, LSM-ID is managed by mLDP and can range from 0 to 0xFFFFF
(20-bits). For IR, the LSM-ID space is partitioned between mLDP and IR. For IR tunnels, the top (20th) bit
is always be set, leading to a range of 0x80000 to 0xFFFFF. mLDP
’
s limit is 0 to 0x7FFFF.
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 IOS XR
Interface and Hardware Component Configuration Guide for the Cisco CRS Router
Cisco IOS XR Multicast Configuration Guide for the Cisco CRS Router, Release 5.2.x
63
Implementing Multicast Routing on Cisco IOS XR Software
PE-PE Ingress Replication