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Community Member

Multicast question

I've router and PC station which send multicast traffic to address 239.255.1.1

All configs here -

http://www.cisco.com/en/US/tech/tk828/technologies_configuration_example09186a00801a5aa2.shtml

When i run

#sh ip igmp groups

IGMP Connected Group Membership

Group Address Interface Uptime Expires Last Reporter

224.0.1.40 Tunnel0 02:35:51 00:02:17 8.8.8.9

But i don't see 239.255.1.1

Why so? How to resolve it?

6 REPLIES

Re: Multicast question

Hello,

you said that you have 1 router and 1 PC, but the configs on the link are for a tunnel which involves 2 routers and 2 end stations?

PC is sending the traffic, but is there anyone listening?

did you use ip igmp joing-group 239.255.1.1 on the router?

Please give us more information.

thanks,

Vlad

Community Member

Re: Multicast question

Sorry, i've made lab like in the cisco's example. Certainly - 2 routers and 2 PC's.

I didn't use

ip igmp joing-group 239.255.1.1

Is't neccessary? I didn't found it in the cisco's example.

Re: Multicast question

this command is only necessary when you dont have a multicast client software on the destination PC.

try it for instance, add this command on the interface leading to the 2nd PC.

Let me know,

Vlad

Community Member

Re: Multicast question

Yes, it's help

LEFT#sh ip igmp groups

IGMP Connected Group Membership

Group Address Interface Uptime Expires Last Reporter

239.255.1.1 Serial0/0/0 00:00:17 stopped 1.1.1.1

239.255.1.1 FastEthernet0/0 00:03:47 00:02:51 192.168.3.2

224.0.1.40 FastEthernet0/0 21:19:15 00:02:42 192.168.3.2

But i don't see multicast traffic at the reciver.

Where can be problem?

Community Member

Re: Multicast question

at the second router ( where connected mcast sender)

i see next-

Outgoing interface list: Null

may be here problem?

RIGHT#sh ip mroute 239.255.1.1

IP Multicast Routing Table

Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,

L - Local, P - Pruned, R - RP-bit set, F - Register flag,

T - SPT-bit set, J - Join SPT, M - MSDP created entry,

X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,

U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel

Y - Joined MDT-data group, y - Sending to MDT-data group

Outgoing interface flags: H - Hardware switched, A - Assert winner

Timers: Uptime/Expires

Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 239.255.1.1), 00:25:34/stopped, RP 0.0.0.0, flags: DCL

Incoming interface: Null, RPF nbr 0.0.0.0

Outgoing interface list:

FastEthernet0/0, Forward/Sparse-Dense, 00:25:34/00:00:00

(192.168.2.2, 239.255.1.1), 00:17:39/00:02:59, flags: PLT

Incoming interface: FastEthernet0/0, RPF nbr 0.0.0.0

Outgoing interface list: Null

Community Member

Re: Multicast question

^ well.. so RIGHT router thinks no one from the LEFT router wants to join 239.255.1.1 ..

Can you paste the "show ip mroute 239.255.1.1" from

the LEFT router?

Make sure "ip pim sparse-dense-mode" is on the applicable interfaces ( so the tunnel interfaces and the e0/0 interfaces) ..

Eric

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