From: Joe Chang (changjoe@earthlink.net)
Date: Fri Jun 25 2004 - 11:03:57 GMT-3
That scenario has me thinking: would suboptimal routing cause multicast
loops? So long as the suboptimal unicast route is a valid route it will lead
upstream to the multicast source.
----- Original Message -----
From: "Tom Rogers" <cccie71@yahoo.com>
To: <ccielab@groupstudy.com>
Sent: Thursday, June 24, 2004 10:05 PM
Subject: TTL scoping -Last time
> Hi guys,
>
> I am trying to get a handle on this TTL scoping... but some how lacking
some very fundamental. I came across this scenario, and have gone numerous
times but cannot understand it...
>
> "Recently you have noticed suboptimal forwarding of multicast feeds
throughout your network due to problems in your unicast routing. In order to
prevent multicast feeds from looping around the network, configure R1 so
that it does not send any multicast traffic out interface E0/0 that has TTL
of less than 13"
>
> Their answer is
>
> int e0/0
>
> ip multicast ttl-threhold 12
>
> My problem is, should it it be 14. I read the Williamson Page 44 chapter 2
Multicast Basics
>
> It says if TTL of 24 is coming into the router and it wants to go out via
int OUT, then OUT interface should have a lowere TTL than what ever is
coming in. SO it should 23 or less.
>
> But if want Multicast not to go out then increase the TTL threshold on OUT
interface hiigher than 24
>
> Having said... What am I thinkning wrong that answer in IE should 14 ???
>
> Thanks
>
> Tom
>
>
>
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