08-16-2013 02:20 AM - edited 03-04-2019 08:46 PM
I seem to be unable to properly configure the 7304 (R2) router in the attached drawing so that the RECeiver can have access to the 224.6.0.101 group. The only multicast-related configuration on Gi0.981 and Gi.989 is "ip pim sparse-mode", and basicly what I'm puzzled about is the output of the "show ip mroute 224.6.0.101 (count)" command(s) on R2:
(*, 224.6.0.101), 01:13:26/00:02:59, RP 0.0.0.0, flags: SP
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list: Null
Group: 224.6.0.101, Source count: 0, Packets forwarded: 0, Packets received: 85377
RP-tree: Forwarding: 0/0/0/0, Other: 85377/85377/0
I mean, why is the route pruned, and why the RPF failed counters (the router and the source being directly connected)?
The RECeiver also has access to some 224.5.0.x groups behind router R1, and when I configured "ip pim sparse-mode" on Gi0.989 of router R1, all the traffic belonging to those 224.5.0.x groups started pouring into Gi0 of R1. Is there any way to avoid that?
08-16-2013 04:30 AM
Hi,
No RP configured from the output?
(*, 224.6.0.101), 01:13:26/00:02:59, RP 0.0.0.0, flags: SP
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list: Null
HTH,
Lei Tian
08-16-2013 05:50 AM
mcast-router#sh ip pim rp 224.6.0.101
Group: 224.6.0.101, RP: 0.0.0.0
I'd like to think that this is the simplest multicast routing setup possible (one router passing multicast traffic from one (sub)interface to another), but could the presence of R1 somehow "affect" the 224.6.0.101 group?
08-16-2013 06:11 AM
Hi,
The receiver is not directly connected to R2. You need RP. Change that to dense mode, see if you can get the traffic.
HTH,
Lei Tian
Sent from Cisco Technical Support iPhone App
08-16-2013 06:14 AM
Hello
For pim sparse-mode you need a RP specifed be it autorp or static.
sh ip pim rp mapping
static rp (on all routers)
ip pim rp address x.x.x.x
autorp
conf t
int lo0
ip address 1.1.1.1 255.255.255.255
ip pim spare-mode
exit
ip pim send-rp-announce 1.1.1.1 scope 10
ip pim send-rp-discovery Loopback0 scope 10
All pim sparse enable routers need to be able to reach defind rp address specifed
res
Paul
Please don't forget to rate any posts that have been helpful.
Thanks.
08-16-2013 06:44 AM
Here's what I did:
access-list 22 permit 224.6.0.101
ip pim rp-address 192.168.81.254 22
(I know a loopback is recommended, but I think a (sub)interface address isn't forbidden either). Now I have:
(*, 224.6.0.101), 00:01:53/stopped, RP 192.168.81.254, flags: SP
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list: Null
(192.168.81.1, 224.6.0.101), 00:01:53/00:02:53, flags: PT
Incoming interface: GigabitEthernet0.981, RPF nbr 0.0.0.0
Outgoing interface list: Null
Group: 224.6.0.101, Source count: 1, Packets forwarded: 0, Packets received: 4773
RP-tree: Forwarding: 0/0/0/0, Other: 0/0/0
Source: 192.168.81.1/32, Forwarding: 0/-21/0/0, Other: 4773/0/4773
What could be wrong this time?
08-16-2013 11:04 AM
Hi ,
Your receiver is not directly connected. You either config the RP on the receiver 's default gateway, or change to dense mode.
The state tells you the router receives the multicast but don't know where to send it.
HTH,
Lei Tian
Sent from Cisco Technical Support iPhone App
08-16-2013 11:45 AM
I'll try that as well, but this requirement of IP reachability to the receiver brings another question: R1 is not under my administration, but I do know the config of its interface towards my Vl989, and it only contains "ip pim sparse-mode" and "ip multicast boundary" - however, I can access the 224.5.0.x groups with any computer connected to Vlan989, no matter the IP address. Is there any other config bit that the admin of R1 might have used in order to allow me to do that?
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide