slebbon
IS-IT--Management
- Dec 29, 2006
- 5
We have a number of (remote) office sites with their own 3com NBX 100 systems. We also have a 3com NBX 100 system at the local (main) site. Right now the sites are connected via Cisco DMVPN tunnels (all IP traffic allowed), and all Cisco routers currently do NOT have Multicast routing enabled. Right now each site's NBX systems operate independently, however they do use some VTL's to communicate calls between the offices (this traffic flows over the DMVPN tunnels just fine).
We also would like to have some remote sites that do NOT contain their own NBX systems to have phones tied into to 1 of the NBX systems. This works with the most basic phone features, but all phone features requiring multicast don't work (as expected, since multicast traffic is restricted to each local office's network due to no router path to let it get out). In order to enable some of those remote offices without NBX systems to use multicast, it would seem we'd have to enable ip multicast on the ciso routers, at least in the main office housing the NCP we want to tie phones into, and the remote office without an NCP. Our concern however is that multicast traffic from one office with an NCP will 'leak' into other office networks that have NCPs as well. We can only imagine that this would be a 'bad thing'.
What can we do about this? Anyone have suggestions how to configure the routers to get this to work as we want? Are there any other approaches we should look at? Other options?
Thank you.
We also would like to have some remote sites that do NOT contain their own NBX systems to have phones tied into to 1 of the NBX systems. This works with the most basic phone features, but all phone features requiring multicast don't work (as expected, since multicast traffic is restricted to each local office's network due to no router path to let it get out). In order to enable some of those remote offices without NBX systems to use multicast, it would seem we'd have to enable ip multicast on the ciso routers, at least in the main office housing the NCP we want to tie phones into, and the remote office without an NCP. Our concern however is that multicast traffic from one office with an NCP will 'leak' into other office networks that have NCPs as well. We can only imagine that this would be a 'bad thing'.
What can we do about this? Anyone have suggestions how to configure the routers to get this to work as we want? Are there any other approaches we should look at? Other options?
Thank you.