07-07-2004 03:03 AM - edited 03-02-2019 04:53 PM
I try to configure static multicast routing on a router with 2 ethernet interfaces. Unfortunately it`s not possible to configure an ethernet interface as the outgoing interface for an mroute. I´ve attached a small network diagram.
What have I to configure to bring this up working?
Thanks for your help.
Regards,
Karsten
07-07-2004 04:34 AM
I couldn't see the diagram.
Can you post the configuration?
Regards,
John
07-07-2004 04:43 AM
I saw the diagram.
Can you explain what you are going to do?
The first step, enable "ip multicast-routing" protocol in ther router.
The second step, configure "ip pim dense mode" each ethernet interfaces.
07-07-2004 05:49 AM
Thanks for your reply!
I´ts a quite simple task:
We use a configuration tool which is using ip multicast to find a configserver.
The client (source) is sending a request to the multicast address 239.255.255.1 (destination). The server answer is an unicast. If clients and server are on the same ethernet segment, is works fine.
If we try it via the router, the multicast pakets are not arriving at the server.
my multicast config:
ip multicast-routing
interface FastEthernet0/0
ip pim dense-mode
interface FastEthernet0/1
ip pim dense-mode
I tried to configure a static mroute like:
ip mroute 10.195.0.1 255.255.255.255 static FastEthernet 0/0
The result is:
"Next hop IP address required for multi-access media."
???
07-07-2004 06:40 AM
Please, Check the routing table.
If you want to configure static mroute, the route have to exist the routing table.
07-07-2004 07:10 AM
Sounds interesting. Could you please explain, what exactly you mean.
Should be there a mroute already in the multicast routing table or may be a unicast route?
07-07-2004 10:29 AM
Yes. I mean "unicast routing table."
Multicast routing table refer to unicast routing table. So, if you want to configure staitic multicast route, the first of all, the route is reachable, and then RPF check succeed.
Good Luck...
07-08-2004 12:13 AM
OK, that´s important to know. In my case both networks are directly connected to the router and therefore in the unicast routing table. Is there anything else what I´ve to check out?
07-08-2004 04:20 AM
Could you try to change ip address instead of ethernet interface at the end of the static mroute configration?
07-08-2004 05:27 AM
Your config is correct. You should not have to configure any static multicast routes. Could you post the unicast IP addresses for the sources and the destination. Also post a "show ip route" and "show ip mroute".
07-13-2004 06:58 AM
The unicast IPs are:
Source: 10.195.158.20/28
Dest.: 10.195.158.10/28
sh ip route:
C 10.195.158.16/28 is directly connected, FastEthernet0/0
C 10.195.158.0/28 is directly connected, FastEthernet0/1
sh ip mroute:
(*, 239.255.255.1), 00:05:48/00:02:56, RP 0.0.0.0, flags: DC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
FastEthernet0/0, Forward/Dense, 00:00:07/00:00:00
FastEthernet0/1, Forward/Dense, 00:05:48/00:00:00
07-21-2004 08:04 AM
I found out, what the reason was:
It`s so simple. My colleague wrote a java application using ip multicast. I tested the connection with this software all the time ;-(
He set the ttl to 1. So it was no wonder that it works without the router but not with it.
Tanks a lot folks!
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