02-25-2007 05:08 AM - edited 03-05-2019 02:33 PM
Hi,
I have a basic multicast routing situation, but I can't get it work.
I should route multicast traffic from VLAN x to VLAN y. Both VLANs are defined in same Catalyst 6000.
Catalyst Multicast config:
ip multicast routing
ip pim rp-address [C6000 address]
interface VlanX
ip address 10.X.X.1 255.255.252.0
ip pim sparse-mode
interface VlanY
ip address 10.Y.Y.1 255.255.255.240
ip pim sparse-mode
Do I have to give some more commands?
BR,
Teemu
02-25-2007 08:15 AM
Your configuration looks good. Can you tell us more about the specific multicast application you are using. Some multicast applications issue IP packets with a TTL of 1 by default. Make sure that this is not the case.
Hope this helps,
02-26-2007 06:06 AM
I captured traffic and noted that in all packets the TTL field was 1. I think that it was the problem. Programmers will make changes for TTL field, and let see if it that was the case.
Does it mean that when the packet goes to the router, it reduce TTL from 1 to 0 and after that router drops the packet? And Multicast routing process dosen't never get the packet?
Thanks a lot, your post was very helpful.
~Teemu~
03-01-2007 10:28 AM
Teemu,
Your understanding is correct. Packets with TTL of 1 are not meant to leave the local subnet. The router will get them, decrement the TTL, sees it reaches 0 and then discard them.
Hope this helps,
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