intervlan multicast

mikedelafield · ‎05-02-2008

hi.

i'm having trouble setting up intervlan multicasting on a catalyst 4510R.

multicast within the same vlan works fine but after putting the source in a separate vlan i cannot get it to work.

ip multicast-routing is enabled

and ip pim sparse-mode is set on the vlans in question

i have tried dense-mode, adding an RP address. pretty much everything

i'm sure i've missed something simple as it doesn't seem that difficult a thing to set up!

could someone help me with the config?

thanks.

Harold Ritter · ‎05-02-2008

Mike,

A very common problem is that the source transmits using a TTL of 1, which will work if the source and the receiver are on a common subnet but won't if they are separated by one or more router.

Regards,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
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mikedelafield · ‎05-02-2008

good call on that one!! spot on

ttl was indeed set to 1.

ended up using ip pim sparse-mode and setting the RP-Address manually

thanks