[187291] in North American Network Operators' Group
RE: Multicast stream monitoring tools
daemon@ATHENA.MIT.EDU (Robert Jacobs)
Tue Jan 26 14:50:27 2016
X-Original-To: nanog@nanog.org
From: Robert Jacobs <rjacobs@pslightwave.com>
To: "nanog@nanog.org" <nanog@nanog.org>
Date: Mon, 25 Jan 2016 14:41:25 +0000
In-Reply-To: <20160125081832.15e0f223@localhost>
Errors-To: nanog-bounces@nanog.org
If you are in the Video content delivery business using mcast then these f=
olks are one of the leaders. You can put multiple probes and make sure you=
r mcast coming off source is solid, through the core router solid, and at t=
he edge... http://www.ineoquest.com/ they are not cheap but worth every =
dollar =20
-----Original Message-----
From: NANOG [mailto:nanog-bounces@nanog.org] On Behalf Of John Kristoff
Sent: Monday, January 25, 2016 8:19 AM
To: nanog@nanog.org
Subject: Re: Multicast stream monitoring tools
On Mon, 25 Jan 2016 12:48:47 +0400
Murat Kaipov <mkaipov@outlook.com> wrote:
> Hello folks!We have an issue with some multicast streams. For some=20
> reason picture is very unstable in evening, during internet usage peak=20
> times. We have had monitor our links and uplinks and there wasn't any=20
> oversubscribtion. I looking for usefull multicast stream monitoring=20
> tool now. Any suggestion?
If it is not capacity saturation, it may have something be membership stabi=
lity. Not knowing anything about your IP multicast configuration, it is im=
possible to say anything concretely with certainty
This is to say however, you may want to also be sure to monitor membership,=
interface, port, PIM, ..., states.
All the way down to spanning tree recalculation, you may not notice it with=
unicast, but anything that might prevent a stream from being forwarded due=
to a join state disruption are sometimes the causes of these types of even=
ts.
It is a bit old and may not be the latest copy, but here is a copy of Bill =
Nickless' very handy troubleshooting methodology you should have
handy:
<https://nets.ucar.edu/nets/docs/procs/troubleshooting/troubleshooting-mu=
lticast.pdf>
Unfortunately there isn't much in that paper about Layer-2 related issues a=
s I alluded to above, but hopefully it gets you part of the way there.
John
