All things related to multicast

[ken lindahl <>]

Alan,

your configuration snippet shows cgmp enabled on the two router
interfaces. i'm assuming there are cgmp-enabled switches on one
or both subnets as well. i don't think cgmp and ssm can play together
on the receiver's network. see CSCdt45511:

    "If an interface configured for IGMP version 3 is also configured
    for CGMP, and if there is also a switch connected to the interface
    enabled for CGMP, then receiver hosts using IGMPv3 will not
    correctly receive IP Multicast traffic. The reason for this
    failure is that the router does not correctly generate CGMP join
    messages upon receipt of IGMP version 3 membership reports from
    the host.
    
    "Workaround: If CGMP is required on an interface to support a CGMP
    switch in the network, then the router can be configured for
    IGMP version 2, forcing hosts to generate IGMPv2 membership
    reports. This workaround inhibits SSM with IGMPv3. You can
    still use IGMPv3lite and URD in this configuration in support
    of SSM though . If SSM with IGMPv3 is required, you must disable
    CGMP on the switches until this ddts is resolved."

this bug report is still open; there is no "first fixed-in version" shown.

have you been pestering your switch salescritters for igmpv3 snooping?
i've been pestering ours, to little avail. i still don't know of any
switch that can do v3 snooping.

cheers,
ken

On Mon, 17 Dec 2001, Alan Crosswell 
<>
 wrote:
>I got the Talarian shim.  Diddled the registry entry to use the old
>v3lite port 659 since I think my IOS doesn't support the IANA-assigned
>port yet.  Still no luck.  My source is on Vlan39, client on Vlan7,
>both on the same router.  Source is running Win2K with the Talarian
>shim. Client is WinXP.  IOS version is related to 12.1(8a)E.  Once
>finals are over we'll be going up to the next supported release.
>
>On the source and client vlans I am seeing these similar messages when I
>debug ip igmp:
>
>.Dec 17 15:01:58.728 EST: IGMP: Received v2 Report on Vlan39 from 
>128.59.31.169 
>for 232.149.180.53
>.Dec 17 15:01:58.728 EST: IGMP: Received Group record for group 
>232.149.180.53, 
>mode 2 from 128.59.31.169 for 0 sources
>.Dec 17 15:01:58.728 EST: IGMP: Setting CSR group timer for group 
>232.149.180.53
>.Dec 17 15:01:58.728 EST: IGMP: Group Record mode 2 for SSM group 
>232.149.180.53
> from 128.59.31.169 on Vlan39, ignored
>
>...
>
>.Dec 17 15:01:55.260 EST: IGMP: Received v2 Report on Vlan7 from 128.59.7.99 
>for
> 232.149.180.53
>.Dec 17 15:01:55.260 EST: IGMP: Received Group record for group 
>232.149.180.53, 
>mode 2 from 128.59.7.99 for 0 sources
>.Dec 17 15:01:55.260 EST: IGMP: Setting CSR group timer for group 
>232.149.180.53
>.Dec 17 15:01:55.260 EST: IGMP: Group Record mode 2 for SSM group 
>232.149.180.53
> from 128.59.7.99 on Vlan7, ignored
>
>I'm concerned about "0 sources" and "ignored" :-)
>
>Here's a snippet from my router config:
>
>ip pim ssm default 
>...
>interface Vlan7
> ...
> ip pim sparse-dense-mode
> ip igmp version 3
> ip igmp v3lite
> ip cgmp
> ip urd
>end
>
>...
>
>interface Vlan39
> ...
> ip pim sparse-dense-mode
> ip igmp v3lite
> ip cgmp
> ip urd
>
>/a
>
>