From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Tue Jul 26 2005 - 12:39:07 GMT-3
Jamie,
When you do a standard ping (i.e. ping 224.0.0.1) you source the
packet from all interfaces. If you want to be more specific do an
extended ping and specify the source address, outgoing interface, and
repeat count.
Also remember to turn off "ip mroute-cache" in the transit path
if you are trying to debug transit multicast packets with the "debug ip
mpacket" command.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Jamie Caesar
> Sent: Tuesday, July 26, 2005 9:55 AM
> To: ccielab@groupstudy.com
> Subject: Multicast Pings
>
> I think I must be missing something on how the ping command works with
> multicast traffic. On many of the lab scenarios I have done, when I
> send a ping to the multicast address, I get multiple replies from some
> of the routers.
>
> Looking at a "debug ip mpacket" on those routers that seem to be
> sending multiple ping replies, I will see ping requests sourced from
> multiple interfaces on the source router, and sometimes multiple pings
> from the same source interaface, in addition.
>
> Is this normal behavior, or is there something common that causes this
> to happen. Any insight is appreciated.
>
> Thanks,
> Jamie
>
>
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