Cisco Cisco IOS Software Release 12.2(27)SBC
Configuring Multicast VPN Extranet Support
Information About Multicast VPN Extranet Support
7
Cisco IOS IP Multicast Configuration Guide
Hardware Acceleration for Multicast VPN Extranet Support on Catalyst 6500
Series Switches
Series Switches
Beginning in Cisco IOS Release 12.2(33)SXH, on Catalyst 6500 series switches, forwarding entries for
source and receiver MVRFs are linked in hardware (similar to how they are in linked in software for the
Multicast VPN Extranet Support feature) and packets are replicated in hardware when being forwarded
to extranet MVPN sites. This functionality is referred to as the Hardware Acceleration for Multicast
VPN Extranet Support feature.
source and receiver MVRFs are linked in hardware (similar to how they are in linked in software for the
Multicast VPN Extranet Support feature) and packets are replicated in hardware when being forwarded
to extranet MVPN sites. This functionality is referred to as the Hardware Acceleration for Multicast
VPN Extranet Support feature.
Overview of Multicast VPN Extranet VRF Select
Prior to the introduction of the Multicast VPN Extranet VRF Select feature in Cisco IOS Release
12.2(31)SB2 and subsequent 12.2SB releases, RPF lookups for a source address could only be
performed in a single VRF, that is, in the VRF where Internet Group Management Protocol (IGMP) or
PIM joins are received, in the VRF learned from BGP imported routes, or in the VRF specified in static
mroutes (when RPF for an extranet MVPN is configured using static mroutes). In those cases, the source
VRF is solely determined by the source address or the way the source address was learned.
12.2(31)SB2 and subsequent 12.2SB releases, RPF lookups for a source address could only be
performed in a single VRF, that is, in the VRF where Internet Group Management Protocol (IGMP) or
PIM joins are received, in the VRF learned from BGP imported routes, or in the VRF specified in static
mroutes (when RPF for an extranet MVPN is configured using static mroutes). In those cases, the source
VRF is solely determined by the source address or the way the source address was learned.
The Multicast VPN Extranet VRF Select feature provides the capability for RPF lookups to be
performed to the same source address in different VRFs using the group address as the VRF selector.
This feature enhances extranet MVPNs by enabling service providers to distribute content streams
coming in from different MVPNs and redistributing them from there.
performed to the same source address in different VRFs using the group address as the VRF selector.
This feature enhances extranet MVPNs by enabling service providers to distribute content streams
coming in from different MVPNs and redistributing them from there.
The Multicast VPN VRF Select feature is configured by creating group-based VRF selection policies.
Group-based VRF selection policies are configured using the ip multicast rpf select command. The ip
multicast rpf select command is used to configure RPF lookups originating in a receiver MVRF or in
the global routing table to be resolved in a source MVRF or in the global routing table based on group
address. Access control lists (ACLs) are used to define the groups to be applied to group-based VRF
selection policies.
Group-based VRF selection policies are configured using the ip multicast rpf select command. The ip
multicast rpf select command is used to configure RPF lookups originating in a receiver MVRF or in
the global routing table to be resolved in a source MVRF or in the global routing table based on group
address. Access control lists (ACLs) are used to define the groups to be applied to group-based VRF
selection policies.
illustrates an extranet MVPN topology with the Multicast VPN VRF Select feature configured.
In this topology, (S, G1) and (S, G2) PIM joins originating from VPN-Green, the receiver VRF, are
forwarded to PE1, the receiver PE. Based on the group-based VRF selection policies configured, PE1
sends the PIM joins to VPN-Red and VPN-Blue for groups G1 and G2, respectively.
forwarded to PE1, the receiver PE. Based on the group-based VRF selection policies configured, PE1
sends the PIM joins to VPN-Red and VPN-Blue for groups G1 and G2, respectively.