IP Multicast Test between to 2501 1

[norteldude78]

Hello, I have a simple topology I am trying to get multicast traffic to pass.

host A ---> 2501A (s0) <-----> (s0) 2501B ----> host B

i want host a to be the server, host B to recieve. I am using iperf for the mcast server/client. iperf works great for tcp/udp traffic, but mcast does not go through.

2501A has ios 11.2, 2501B has 11.1.

I have the 'ip multicast-routing' command available so Im guesing I can do it. any ideas where to start?

peace

 

[ADB100]

You need to enable multicast on a per-interface basis as well. You have several options:

PIM Dense-Mode
PIM Sparse-Mode
PIM Sparse-Dense-Mode

For Sparse or Sparse-Dense-Mode you will also need a Rendezvous Point(s). However for your simple test scenario where your router has full visibility of the entire network (2 interfaces) a RP isn't necessary.

http://www.cisco.com/en/US/products...figuration_guide_chapter09186a00800ca794.html

http://www.cisco.com/en/US/tech/tk828/technologies_tech_note09186a0080094821.shtml

HTH

Andy

 

[norteldude78]

Thanks

I have put both the ethernet intefaces in pim dense mode. I am now using mcast.exe (from server 2003 resource kit).

I can send the mcast packets from host B but they never get to my host a. I'm running ethereal on both hosts just to get a clue of what's happening.

I also have "debug ip mcast" on the cisco routers...I see nothing.

I will try putting the serial intefaces I PIM dense mode as well...

peace

 

[ADB100]

What syntax are you using at the command line for the sender? Are you setting the TTL? This needs to be 2 or greater to get past the 1st hop -

iperf -c 224.0.67.67 -u --ttl 5

HTH

Andy

 

[ADB100]

I have just set this up on a couple of PC's (I used Win32 iperf 1.7 as version 2.0.2 wouldn't work with mutlicast for some reason?).

You need to start the receiver before the sender (obviously...)

Receiver:
iperf -s -B 239.255.255.1 -u -i 1

Sender:
iperf -c 239.255.255.1 -u -ttl 5 -t 5

It seems a bit hit and miss under Win32 - I have previously used MPING from Microsoft, as well as the 'MCAST' tool included in the Windows Resource Kit. MPING is the easiest though:

http://research.microsoft.com/barc/mbone/mping.aspx

The tool by default sends to the group address as well as joins the group.

HTH

Andy

 

[norteldude78]

That is great stuff. I am going to test again tonight with mping and iperf. Thanks a lot.

peace

 

[norteldude78]

I got mping to work, iperf is giving me errors on server 2003.

I needed to add the "ip pim" commands on the serial interfaces and now it's passing multicast traffic.

sweet, Thanks!

peace

 

[ADB100]

I needed to add the "ip pim" commands on the serial interfaces

Yes you need PIM enabling on all interfaces where the multicast traffic will flow.

Andy