I'm setting up an MPLS carrier with VPNs in GNS3, using Cisco 7200 routers.
Exact version I'm using is
C7200-ADVIPSERVICESK9-M Version 15.2(4)S5, but I'm willing to upgrade/change if that's needed.
On IPv4 setting up an MPLS carrier carrying multicast is pretty simple. All you need to do is set up the PIM peering between PE and CE, and then enable
address-family ipv4 mdt on the PE-PE iBGP peering.
But how do I do the same thing for carrying IPv6 multicast inside a VPN?
I've tried enabling anything ipv6 & multicast related in the PE-PE iBGP session, but it doesn't appear to work. The two PE routers can only see (with
show ipv6 mroute vrf SUB) the multicast groups that are on the CE routers attached directly to them.
vrf definition SUB rd 1:2 address-family ipv4 mdt default 184.108.40.206 mdt data 220.127.116.11 0.0.0.255 threshold 1 route-target both 1:2 address-family ipv6 mdt default 18.104.22.168 mdt data 22.214.171.124 0.0.0.255 route-target both 1:2 ipv6 multicast-routing ipv6 multicast-routing vrf SUB interface Ethernet3/0 description To CE vrf forwarding SUB ip address 126.96.36.199 255.255.255.0 ip pim sparse-mode ipv6 address 2001:12:13::1/64 router bgp 1 neigh 188.8.131.52 remote-as 1 address-family ipv4 neigh 184.108.40.206 activate neigh 220.127.116.11 send-community both address-family vpnv4 neigh 18.104.22.168 activate neigh 22.214.171.124 send-community both address-family ipv4 mdt neigh 126.96.36.199 activate neigh 188.8.131.52 send-community both address-family vpnv6 neigh 184.108.40.206 activate neigh 220.127.116.11 send-community both address-family vpnv6 multicast neigh 18.104.22.168 activate neigh 22.214.171.124 send-community both address-family ipv6 mvpn neigh 126.96.36.199 activate neigh 188.8.131.52 send-community both address-family ipv4 vrf SUB neigh 184.108.40.206 remote-as 2 neigh 220.127.116.11 activate neigh 18.104.22.168 send-community both neigh 22.214.171.124 remote-as 2 address-family ipv6 vrf SUB neigh 2001:12:13::3 remote-as 2 neigh 2001:12:13::3 activate neigh 2001:12:13::3 send-community both
mdt overlay use-bgpto the VRF definition.
- Enabling all of the ipv6 bgp iBGP address families that I could
On the CE router I have joined groups using:
interface Loopback0 ipv6 mld join-group FF35:12::1 2001:2::4 ipv6 mld join-group FF38:20:2001:2::3 2001:2::4
2001:2::4 is the remote CE router)
ipv6 mld join-group but with a source of the local PE works fine, and the PE router can reach the multicast address. The directly connected PE-CE pair agrees in
show ipv6 mroute /
show ipv6 mroute vrf SUB, so communication works there. That's why I suspect the iBGP configuration.
On the closest PE router I see:
R1# show ipv6 mroute vrf SUB FF38:20:2001:2::3 (2001:2::4, FF38:20:2001:2::3), 00:04:27/00:03:07, flags: ST Incoming interface: Tunnel2 RPF nbr: ::FFFF:126.96.36.199 Immediate Outgoing interface list: Ethernet3/0, Forward, 00:04:27/00:03:07
What am I missing? How do I share multicast routing information over iBGP, like how MDT address family does it for IPv4?
I don't want to set up GRE tunnels, since that wastes resources in the carrier.