Here is what I want to do:

On a switch / router running cisco IOS ( Ideally it would work on a Lanbase image on a 3560G but it is possible to use 65xx routers also ) I receive two udp multicast streams on vlan 100:

  • vlan 100, @ and @

What I need to do is to forward:

  • @ on vlan 101
  • @ on vlan 102

For the time being I do not care about igmp snooping, which is disabled ( multicast traffic is treated as broadcast ), but an ideal solution would forward igmp queries from vlan 101/102 to vlan 100.

As suggested by @metacom I did the following:

I am running: ipbasek9 / 12.2(44)SE6

ip multicast-routing distributed
no ip igmp snooping
ip igmp ssm-map enable
no ip igmp ssm-map query dns
ip igmp ssm-map static 11
ip igmp ssm-map static 12
ip igmp ssm-map static 16
vlan 100
 name video feeds a and b
vlan 101
 name video a

interface vlan 100
 ip address
 # How am I supposed to explain that feeds and have a source on vlan 100?
 ip igmp static-group source ssm-map
 ip igmp static-group source ssm-map
 ip pim passive

interface vlan 101
 ip address
 ip igmp static-group source ssm-map
 ip pim passive

ip pim ssm range 88

access-list 11 permit
access-list 12 permit

access-list 88 permit
access-list 88 permit

With this configuration, I have a server with a trunk connection to both vlans. On vlan 100 I can see ( via tcpdump for example ) the and streams. On vlan 101 I do not have any multicast streams.

When I run show ip mroute I see nothing. I do not know how to configure pim. In this image I have only pim passive , I do not know if it is a good or bad thing to activate it.


I have activated ip pim passive on both SVI and here is the result for show ip igmp groups

Group Address    Interface                Uptime    Expires   Last
Reporter   Group Accounted       Vlan101                 00:07:19  stopped       Vlan100                 00:07:31  stopped

Also if I run show ip mroute I do not have an incoming interface for this group:

#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,
       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

(,, 00:14:42/00:02:34, flags: sTI
  Incoming interface: Null, RPF nbr
  Outgoing interface list:
    Vlan101, Forward/Sparse-Dense, 00:14:29/00:00:44
    Vlan100, Forward/Sparse-Dense, 00:14:41/00:02:34

Configuring Static Traffic Forwarding with SSM Mapping : http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_igmp/configuration/xe-3s/imc-igmp-xe-3s-book/imc_ssm_map.html#GUID-DDD77D1A-D5C2-4402-A7C6-D1728B94A833

This sounds like exactly what you need.

The configuration would add an acl for vlan101 permitting and one for vlan 102 allowing Enable pim sparse-mode on all 3 vlans, ssm-map, multicast-routign and you should be good to go!

Edit: I just closed 44 tabs from trying to figure this out!

Edit 2: Change

ip igmp static-group source
ip igmp static-group source  


 ip igmp static-group source ssm-map
 ip igmp static-group source ssm-map

Edit 3 From here: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti/command/imc-cr-book/imc_i2.html#wp1533460393

ip mroute

And also you can probably remove

 ip igmp static-group source ssm-map
 ip igmp static-group source ssm-map

from vlan 100

  • I tried ssm but I can't get it work. Can you look my configuration and tell me what is wrong? – Olivier S Apr 9 '14 at 7:54
  • could you give me the output of: show ip igmp group detail and also enable passive pim on both vlans – metacom Apr 10 '14 at 14:17
  • I have edited the question with the requested configuration changes / request – Olivier S Apr 10 '14 at 19:29
  • Check Edit 2.. the formatting in the answer section makes it easier! – metacom Apr 10 '14 at 20:11
  • I did the change, the question is edited. No change on the show ip mroute and show ip igmp groups results. And still no multicast traffic flooded on vlan 101 – Olivier S Apr 10 '14 at 20:33

After much troubleshooting, I think that it is simply impossible to route multicast traffic with a lanbase image.

As stated in the doc If you need PIM for an SVI uplink port, you should upgrade to the IP services feature set.

On a old 3550 running 12.1(22)EA1a, the trivial following configuration is working fine:

ip multicast-routing

interface Vlan100
 ip address
 ip pim sparse-dense-mode

interface Vlan101
 ip address
 ip pim sparse-dense-mode
 ip igmp static-group source

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