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Implementing Multicast Routing on Cisco IOS XR Software
GTM Using MVPN SAFI
In a GTM procedure, special RD values are used that are created in BGP. The values used are all 0's RD. A
new knob, global-table-multicast is introduced under BGP to create the contexts for these RDs.
MVPN procedures require addition of VRF Route-Import EC, Source-AS EC, and so on to the VPNv4 routes
originated by PEs. With GTM, there are no VRFs and no VPNv4 routes. The multicast specific attributes
have to be added to Global table iBGP routes (either SAFI-1 or SAFI-2). These routes are learnt through
eBGP (from a CE) or from a different Unicast routing protocol.
• The single forwarder selection is not supported for GTM.
• Route Targets: With GTM, there are no VRFs, hence the export and import RTs configured under
VRFs are not reliable. For MVPN SAFI routes, RT(s) must be attached. Export and import Route Targets
configuration under multicast routing is supported. These are the RTs used for Type 1, 3, and 5 routes.
MVPN SAFI routes received without any RTs will not be accepted by an XR PE.
• Core-Tree Protocols: mLDP, P2MP-TE (static and dynamic), and IR core-trees are supported.
• C-multicast Routing: PIM and BGP C-multicast routing are supported.
• MDT Models: Default-MDT and Partitioned-MDT models are supported. Data-MDT is supported, with
its various options (threshold zero, immediate-switch, starg s-pmsi, and so on.)
The configuration is as shown below for Ingress or Egress PEs:
multicast-routing
address-family [ipv4| ipv6]
mdt source Loopback0
mdt default <MLDP | P2MP-TE | ingress-replication>
mdt partitioned <MLDP | P2MP-TE | ingress-replication>
bgp auto-discovery [mldp | p2mp-te | ingress-replication]
export-rt <value>
import-rt <value>
!
!
!
Note
The mdt default, mdt partitioned, and the bgp auto-discovery configurations, are present under VRFs,
however, with GTM Using MVPN SAFI, the configurations are reflected in global table as well.
router bgp 100
address-family [ipv4| ipv6] mvpn
global-table-multicast
!
!
The global-table-multicast configuration enables processing of All-0's RD.
MVPN enhancements
• Anycast RP using MVPN SAFI This procedure uses Type-5 MVPN SAFI routes to convey source
information between RPs. Use this method to support Anycast-RP, instead of using MSDP. This supports
Anycast-RP for both IPv4 and IPv6. Currently, Anycast-RP is supported for IPv4 (using MSDP). BGP
method is supported for GTM using MVPN SAFI and MVPNs.
The configuration is as shown below for Ingress or Egress PEs:
multicast-routing
Cisco IOS XR Multicast Configuration Guide for the Cisco CRS Router, Release 5.2.x
Supported Features
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