I have an inter-AS multicast VPN set up and everything appears good except
on the egress PE (R5) where RPF check is failing.
R1(CE-sender)----R2---R3------inter-as
link------R4---R5s1/0---R6(CE-receiver)
Inter-AS VPN is working, R1 and R6 can ping each other's loopbacks.
Sparse-Mode inside the clouds, MSDP between R3 and R4 (The RPs for each AS)
I have an MDT for 224.25.25.25 which is working (I can tell because the
mroute count for the MDT is increasing with each ping).
R1 is sending to 224.6.6.6 from its loopback 10.1.1.1
Packets get forwarded from R2 all the way to R5, where the R5 RPF check
fails for 10.1.1.1.
Not sure why the RPF check fails because the route exists.
Here are the route, mroute and rpf entries:
R5#sho ip mroute vrf VPNA 224.6.6.6 | be \(
(*, 224.6.6.6), 00:06:05/stopped, RP 0.0.0.0, flags: D
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial1/0, Forward/Dense, 00:06:05/00:00:00
Tunnel0, Forward/Sparse-Dense, 00:06:05/00:00:00
(10.1.1.1, 224.6.6.6), 00:00:01/00:02:58, flags:
Incoming interface: Null, RPF nbr 200.0.0.4 <---- RPF neighbor
Outgoing interface list:
Serial1/0, Forward/Dense, 00:00:01/00:00:00 <---- Interface toward R6
Tunnel0, Forward/Sparse-Dense, 00:00:01/00:00:00
R5#sho ip route vrf VPNA 10.1.1.1
Routing entry for 10.1.1.1/32
Known via "bgp 200", distance 200, metric 0
Tag 100, type internal
Redistributing via ospf 1
Advertised by ospf 1 subnets
Last update from 200.0.0.4 00:26:44 ago
Routing Descriptor Blocks:
* 200.0.0.4 (Default-IP-Routing-Table), from 200.0.0.4, 00:26:44 ago <----
Next hop
Route metric is 0, traffic share count is 1
AS Hops 1
Route tag 100
R5#sho ip rpf vrf VPNA 10.1.1.1
RPF information for ? (10.1.1.1) failed, no route exists <---- How?
R5#
Here you can see the MDT packets being forwarded out of R5 (decapsulation)
but the RPF check incrementing to the group 224.6.6.6:
R5#sho ip mroute 224.25.25.25 count
Group: 224.25.25.25, Source count: 1, Packets forwarded: 15, Packets
received: 15
RP-tree: Forwarding: 0/0/0/0, Other: 0/0/0
Source: 100.0.0.2/32, Forwarding: 15/1/120/0, Other: 15/0/0 <---
Forwarding
R5#sho ip mroute vrf VPNA 224.6.6.6 count
Group: 224.6.6.6, Source count: 1, Packets forwarded: 0, Packets received:
15
Source: 10.1.1.1/32, Forwarding: 0/0/0/0, Other: 15/15/0 <---- RPF
failures
R5#
I tried setting an mroute in the VRF, but it doesn't seem to work. Any
ideas?
If I do an mroute inthe VRF, who should my next hop be (R4 global or R1 in
the VRF)?
Btw, the network has no multi-paths or redundant links.
Thanks,
--
Bryan Bartik
CCIE #23707 (R&S), CCNP
Sr. Support Engineer - IPexpert, Inc.
URL: http://www.IPexpert.com
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