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Router 2811 joinning all multicast groups

andre.ortega
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Hello everyone,

I have a switch 2960 with 15 multicast groups (for video) and now I am configuring a router 2811 to send two multicast groups to another network.

But despite of there is no client sending join yet, the router is joinning in all multicast group, and because of that the router are not standing all the traffic.

Could someone imagine why the router is joinning in all multicast groups?

How could I choose what groups router will join?

Router Config:

ip multicast routing

ip pim bidir-enable

interface f0/0

description Conected to Multicast Source Network

ip address 10.1.1.1 255.255.255.0

ip pim sparse-dense-mode

Thanks.

2 Accepted Solutions

Accepted Solutions

Hello Andre,

No, you don't need an RP but why operate in sparse-dense without an RP? All groups without an RP defined will operate in dense mode. Which is okay but dense is not suitable for large network.

Where does f0/1 connect to? It looks like you are getting several group reports from 139.0.0.1 leading to the *,G. Is f0/1 where the receivers are?

Ryan

View solution in original post

Hi,

look at the IGMP filtering section here : http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_55_se/configuration/guide/swigmp.html#wp1055584

Regards.

Alain

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View solution in original post

7 Replies 7

andre.ortega
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More information:

2811-MRGA#sh ip igmp groups

IGMP Connected Group Membership

Group Address    Interface                Uptime    Expires   Last Reporter   Gr

oup Accounted

231.0.1.11       FastEthernet0/1          00:00:31  00:02:28  139.0.1.1

231.0.1.13       FastEthernet0/1          00:00:24  00:02:35  139.0.1.1

231.0.1.15       FastEthernet0/1          00:00:28  00:02:31  139.0.1.1

231.0.1.16       FastEthernet0/1          00:00:28  00:02:31  139.0.1.1

231.0.1.18       FastEthernet0/1          00:00:23  00:02:36  139.0.1.1

231.0.1.20       FastEthernet0/1          00:00:28  00:02:31  139.0.1.1

231.0.1.23       FastEthernet0/1          00:00:30  00:02:29  139.0.1.1

231.0.1.22       FastEthernet0/1          00:00:26  00:02:33  139.0.1.1

231.0.1.25       FastEthernet0/1          00:00:29  00:02:30  139.0.1.1

231.0.1.24       FastEthernet0/1          00:00:29  00:02:30  139.0.1.1

231.0.1.26       FastEthernet0/1          00:00:28  00:02:31  139.0.1.1

224.0.1.40       Loopback0                00:08:43  00:02:18  2.2.2.1

2811-MRGA#sho

2811-MRGA#show ip mrou

2811-MRGA#show ip mroute

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, E - Extranet,

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

       U - URD, I - Received Source Specific Host Report,

       Z - Multicast Tunnel, z - MDT-data group sender,

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

       V - RD & Vector, v - Vector

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

Timers: Uptime/Expires

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

(*, 231.0.1.11), 00:01:04/stopped, RP 0.0.0.0, flags: DC

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    FastEthernet0/1, Forward/Sparse-Dense, 00:00:35/stopped

    Tunnel0, Forward/Sparse-Dense, 00:01:04/stopped

(150.158.230.252, 231.0.1.11), 00:01:04/00:01:55, flags: PTX

  Incoming interface: FastEthernet0/1, RPF nbr 192.168.26.1, Mroute

  Outgoing interface list:

    Tunnel0, Prune/Sparse-Dense, 00:01:04/00:01:55

(*, 231.0.1.12), 00:01:04/stopped, RP 0.0.0.0, flags: D

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    Tunnel0, Forward/Sparse-Dense, 00:01:04/stopped

(150.158.230.252, 231.0.1.12), 00:01:04/00:01:55, flags: PT

  Incoming interface: FastEthernet0/1, RPF nbr 192.168.26.1, Mroute

  Outgoing interface list:

    Tunnel0, Prune/Sparse-Dense, 00:01:04/00:01:55

(*, 231.0.1.13), 00:01:04/stopped, RP 0.0.0.0, flags: DC

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    FastEthernet0/1, Forward/Sparse-Dense, 00:00:29/stopped

    Tunnel0, Forward/Sparse-Dense, 00:01:04/stopped

(150.158.230.252, 231.0.1.13), 00:01:04/00:01:55, flags: PTX

  Incoming interface: FastEthernet0/1, RPF nbr 192.168.26.1, Mroute

  Outgoing interface list:

    Tunnel0, Prune/Sparse-Dense, 00:01:04/00:01:55

(*, 231.0.1.14), 00:07:37/stopped, RP 0.0.0.0, flags: D

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    Tunnel0, Forward/Sparse-Dense, 00:07:37/stopped

(150.158.230.252, 231.0.1.14), 00:07:37/00:01:13, flags: T

  Incoming interface: FastEthernet0/1, RPF nbr 192.168.26.1, Mroute

  Outgoing interface list:

    Tunnel0, Forward/Sparse-Dense, 00:07:37/stopped

(*, 231.0.1.15), 00:01:04/stopped, RP 0.0.0.0, flags: DC

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    FastEthernet0/1, Forward/Sparse-Dense, 00:00:32/stopped

    Tunnel0, Forward/Sparse-Dense, 00:01:04/stopped

(150.158.230.252, 231.0.1.15), 00:01:04/00:01:55, flags: T

  Incoming interface: FastEthernet0/1, RPF nbr 192.168.26.1, Mroute

  Outgoing interface list:

    Tunnel0, Forward/Sparse-Dense, 00:01:04/stopped

(*, 231.0.1.17), 00:07:37/stopped, RP 0.0.0.0, flags: D

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    Tunnel0, Forward/Sparse-Dense, 00:07:37/stopped

(150.158.230.252, 231.0.1.17), 00:07:37/00:01:16, flags: T

  Incoming interface: FastEthernet0/1, RPF nbr 192.168.26.1, Mroute

  Outgoing interface list:

    Tunnel0, Forward/Sparse-Dense, 00:07:37/stopped

(*, 231.0.1.16), 00:01:04/stopped, RP 0.0.0.0, flags: DC

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    FastEthernet0/1, Forward/Sparse-Dense, 00:00:33/stopped

    Tunnel0, Forward/Sparse-Dense, 00:01:04/stopped

(150.158.230.252, 231.0.1.16), 00:01:04/00:01:55, flags: PTX

  Incoming interface: FastEthernet0/1, RPF nbr 192.168.26.1, Mroute

  Outgoing interface list:

    Tunnel0, Prune/Sparse-Dense, 00:01:04/00:01:55

(*, 231.0.1.18), 00:00:28/00:02:31, RP 0.0.0.0, flags: DC

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    FastEthernet0/1, Forward/Sparse-Dense, 00:00:28/stopped

    Tunnel0, Forward/Sparse-Dense, 00:00:28/stopped

(*, 231.0.1.20), 00:00:33/00:02:26, RP 0.0.0.0, flags: DC

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    FastEthernet0/1, Forward/Sparse-Dense, 00:00:33/stopped

    Tunnel0, Forward/Sparse-Dense, 00:00:33/stopped

(*, 231.0.1.23), 00:01:04/stopped, RP 0.0.0.0, flags: DC

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    FastEthernet0/1, Forward/Sparse-Dense, 00:00:34/stopped

    Tunnel0, Forward/Sparse-Dense, 00:01:04/stopped

(192.131.244.7, 231.0.1.23), 00:01:04/00:01:55, flags:

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    FastEthernet0/1, Forward/Sparse-Dense, 00:00:34/stopped

    Tunnel0, Forward/Sparse-Dense, 00:01:04/stopped

(*, 231.0.1.22), 00:01:04/stopped, RP 0.0.0.0, flags: DC

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    FastEthernet0/1, Forward/Sparse-Dense, 00:00:31/stopped

    Tunnel0, Forward/Sparse-Dense, 00:01:04/stopped

(192.131.244.7, 231.0.1.22), 00:01:04/00:01:55, flags:

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    FastEthernet0/1, Forward/Sparse-Dense, 00:00:31/stopped

    Tunnel0, Forward/Sparse-Dense, 00:01:04/stopped

(*, 231.0.1.25), 00:00:34/00:02:25, RP 0.0.0.0, flags: DC

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    FastEthernet0/1, Forward/Sparse-Dense, 00:00:34/stopped

    Tunnel0, Forward/Sparse-Dense, 00:00:34/stopped

(*, 231.0.1.24), 00:01:04/stopped, RP 0.0.0.0, flags: DC

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    FastEthernet0/1, Forward/Sparse-Dense, 00:00:34/stopped

    Tunnel0, Forward/Sparse-Dense, 00:01:04/stopped

(192.131.244.7, 231.0.1.24), 00:01:04/00:01:55, flags:

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    FastEthernet0/1, Forward/Sparse-Dense, 00:00:34/stopped

    Tunnel0, Forward/Sparse-Dense, 00:01:04/stopped

(*, 231.0.1.26), 00:00:33/00:02:27, RP 0.0.0.0, flags: DC

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    FastEthernet0/1, Forward/Sparse-Dense, 00:00:33/stopped

    Tunnel0, Forward/Sparse-Dense, 00:00:33/stopped

(*, 224.0.1.40), 00:08:48/00:02:14, RP 0.0.0.0, flags: DCL

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    Tunnel0, Forward/Sparse-Dense, 00:07:48/stopped

    Loopback0, Forward/Sparse-Dense, 00:08:48/stopped

2811-MRGA#

Hello,

  Looks like sparse-dense mode with no RPs. Are any RPs configured? Could you please tell me what 139.0.1.1 is?

Regards,

Ryan

Hello Ryan,

When I am using sparse-dense mode, do I need a rp?

I don´t who is 139.0.1.1...

Thanks.

Hello Andre,

No, you don't need an RP but why operate in sparse-dense without an RP? All groups without an RP defined will operate in dense mode. Which is okay but dense is not suitable for large network.

Where does f0/1 connect to? It looks like you are getting several group reports from 139.0.0.1 leading to the *,G. Is f0/1 where the receivers are?

Ryan

Ryan,

the interface F0/1 is connected to my switch (2960).

I din´t discovery who is 139.0.0.1 yet...Do you have any sugestion to locate that IP?

Hello Ryan,

We found the device that are sending join request (139.0.0.1).

Well, we can´t stop that device but we need control what groups the router will join.

All devices are in the same VLAN.

Do you have any sugestion?

Hi,

look at the IGMP filtering section here : http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_55_se/configuration/guide/swigmp.html#wp1055584

Regards.

Alain

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