From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Sun Dec 11 2005 - 04:20:55 GMT-3
The "ip multicast-routing" command allows the router to forward
multicast packets. Even without it enabled the router can still send
multicast packets that it generates. See below:
Rack1R4#sho run | in multicast-routing
Rack1R4#ping 225.5.5.5
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 225.5.5.5, timeout is 2 seconds:
Reply to request 0 from 136.1.245.5, 132 ms
Rack1R4#
Also this error message should help.
Rack1R4(config-if)#ip pim sparse-mode
WARNING: "ip multicast-routing" is not configured, IP Multicast packets
will not be forwarded
HTH,
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Victor Cappuccio
Sent: Saturday, December 10, 2005 9:25 PM
To: ccielab@groupstudy.com
Subject: 2 MCast Question
Hello Guys
I have this confusion today, I was reading Beau book about PIM-DM, and I
can
see that in an example 6-1, show that in PIM-DM, is elected a DR for a
Lan
Segment. --- ok there is a note saying that DR is primarily used in
sparse
mode..
But Why then a DR is elected in PIM-DM?
Ok another question in the similar context
To enable PIM you must enable IP MULTICAST, ok that is the procedure so
cool!
But I do not understand this for example, we can enable ospf (without
talking of other protocols that uses multicast as the mean to transmit
messages) without enabling multicast in the global process? Any reason
for
this?
Thanks
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