From: Scott Morris (swm@emanon.com)
Date: Sun Apr 09 2006 - 01:11:07 GMT-3
I'd be interested in what all the other configs and traffic looks like. The
routers have very different packets that are exchanged for a (*,G) join
versus a (S,G) join. The first is actually directed to the RP, the second
is actually directed towards the source.
So in your testing environment, is it possible that the RP is actually the
source (perceived source?) of your multicast traffic that you are testing?
That may account for what you are seeing here, but in a live environment,
with real multicast servers you shouldn't see this. Only the initial
requestor (with the IGMP setup) has the capability of changing itself from
shared to source tree. Everyone else would be a transit, unless they were
involved with other conversations and responding as well (e.g. you used the
"ip igmp join-group" in many locations).
But in more standard deployments, I don't believe you should see that.
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
CCSI/JNCI
IPExpert CCIE Program Manager
IPExpert Sr. Technical Instructor
swm@emanon.com/smorris@ipexpert.com
http://www.ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Jian
Gu
Sent: Saturday, April 08, 2006 11:32 PM
To: Bob Sinclair
Cc: Cisco certification
Subject: Re: (S,G) entries in shared tree router
I saw (S,G) entries in share tree routers where pim spt-threshold is set to
infinity for the group G throughout the multicast routers between sender and
receiver, and I want to understand the reason behind it.
On 4/8/06, Bob Sinclair <bob@bobsinclair.net> wrote:
>
> Jian,
>
>
> I would expect only (*,G) state downstream from the RP to the last-hop
> router. I would expect to find both (*,G) and (S,G) state between the
> RP and the first-hop router. What are you seeing? Does your shared
> tree overlap the SPT from the RP to the source?
>
> HTH,
>
> Bob Sinclair
> CCIE #10427, CCSI 30427
> www.netmasterclass.net
>
> ----- Original Message -----
> *From:* Jian Gu <guxiaojian@gmail.com>
> *To:* Cisco certification <ccielab@groupstudy.com>
> *Sent:* Saturday, April 08, 2006 1:35 PM
> *Subject:* (S,G) entries in shared tree router
>
> Hi, all,
>
> pim spt-threshold is set to infinity, in what scenario, there will be
> (S,G)
> states on routers in shared tree routers (downstream RP)?
>
> Jian
>
> ______________________________________________________________________
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