Re: pinging multicast address (source is loopback) ??

Ivan, I hope you are well.

Not sure I fully understand your setup, however a few comments related.

1) - make sure your IGPs are correctly set up. Mcast relies on the unicast
routing table too. A good way to test if you have reachability is to do a
ping and source it with a different interface. Do you have full
reachability?

2) Routers need to have connectivity with the RP. Again, this is a routing
issue.

3) Make sure that PIM has found it's neighbors. Use the show command and
make sure that PIM has learned its neighbors.

4) I might suggest for you to look at mcast via multiple layers. This is a
repeat, however it is referring to a perspective and approach.

First - have your IGPs and network.
Second - have your PIM connectivity setup
Third - configure your RPs. Do all the routers know of the RPs?
Forth - Configure a igmp group.
Fifth - add a source via ping.

In this way you will have a network setup, a mcast source, and a mcast
destination.

HTH,

Andrew Lee Lissitz

On Fri, Oct 30, 2009 at 9:40 AM, Ivan <ivanzghr_at_gmail.com> wrote:

> OK. I'm doing some multicast labs with topology where I have 6 routers and
> each router has loopback. After I'm done configuring mcast part I need to
> check it with ping. When I issue ping command to mcast address my ping goes
> out with loopback src address, instead with IP add of the interface where
> the packet goes out. Why is that? When I specify src to be address of
> physical int ping is successful. Otherwise ping is failed and in mroute
> table I have entries like (loopback_add, mcast_add) ??
> Thx.
>
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-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net