[c-nsp] Multicast Issue

Tue Jun 5 11:31:42 EDT 2012

After reading this thread it sounds like it could be DSLAM related. Our brand (OCCAM/Calix) has a few interesting gotchas along these lines. I take it you don't see the same behavior directly connected to the switch?

Also this is a Cisco-oriented list, while some people are familiar with other vendors, other gear isn't exactly the group's expertise.

Cheers
- Ross

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Mohammad Khalil
Sent: Monday, June 04, 2012 6:17 PM
To: danail.petrov at yahoo.com
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Multicast Issue

Hi , I am using IGMP v2 
Regarding the core switch , its non Cisco switch and i only configured IGMP quierer to server for the Vlan created for TVs (STBs)

BR,

> Subject: Re: [c-nsp] Multicast Issue
> From: danail.petrov at yahoo.com
> Date: Mon, 4 Jun 2012 13:11:14 +0300
> CC: td_miles at yahoo.com; matt at mcadory.info; cisco-nsp at puck.nether.net
> To: eng_mssk at hotmail.com
> 
> Hi there,
> 
> A few questions:
> 
> 1. What IGMP version is used?
> 2. What kind is the platform - 65/76 and if so - what modules are used.
> 
> If this is an IGMPv3 - there is a well known issue with it. I should search a little for that but S,G channels are not properly snooped by the switch, which results in broadcast manner you described.
> 
> BR,
> Dani
> On Jun 4, 2012, at 12:14 PM, Mohammad Khalil wrote:
> 
> > 
> > Hi all , thanks for all replies
> > Seemingly after i connected a laptop with wireshark , there seem a lot of broadcast which reach as well unused ports 
> > Bandwidth supposed to be 5M for each stream requested , so is it possibly CPE ?
> > We have configured IGMP quierer on the Core Switch
> > 
> > BR,
> > 
> > Date: Sat, 2 Jun 2012 23:25:22 -0700
> > From: td_miles at yahoo.com
> > Subject: Re: [c-nsp] Multicast Issue
> > To: eng_mssk at hotmail.com; matt at mcadory.info
> > CC: cisco-nsp at puck.nether.net
> > 
> > Badly configured QoS perhaps ? 
> > 
> > What about limitation on how much of the link can be used for multicast ?
> > Can you try adding incremental streams in smaller amounts to find at what point you have too much traffic ?
> > Have you graphed the usage on the link to verify that the amount of bandwidth being used is indeed what you think it might be ?
> > There are about 101 different reasons it could be performing badly, we're sort of just throwing suggestions out there.
> > 
> > 
> > regards,Tony.
> > 
> > 
> >        From: Mohammad Khalil <eng_mssk at hotmail.com>
> > To: matt at mcadory.info 
> > Cc: cisco-nsp at puck.nether.net 
> > Sent: Sunday, 3 June 2012 3:22 PM
> > Subject: Re: [c-nsp] Multicast Issue
> > 
> > 
> > Hi , the issue seems not BW issue as according to the specifications , each TV is supposed to consume 5M
> > So any ideas?
> > 
> > BR,
> > Mohammad
> > 
> >> Date: Wed, 30 May 2012 23:44:31 -0500
> >> Subject: Re: [c-nsp]
> > Multicast Issue
> >> From: matt at mcadory.info
> >> To: eng_mssk at hotmail.com
> >> CC: cisco-nsp at puck.nether.net
> >> 
> >> http://www.cardinalpeak.com/blog/?p=1054 is a good explanation of bit
> >> rate measurement process using WS. Use that to validate your expected
> >> 8Mbps stream rate. Also validate with your DSLAM operator that the
> >> 24Mbps you quote isn't total video and IPTV, but dedicated to video
> >> (or at least dedicated when video is flowing) to get your ~3 streams
> >> worth.
> >> 
> >> Matt
> >> 
> >> 
> >> On Wed, May 30, 2012 at 1:29 AM, Mohammad Khalil <eng_mssk at hotmail.com> wrote:
> >>> 
> >>> The downstream is configured to be 24 M but the upstream is configured to be 4M
> >>> this is the current setup , so it is for sure bandwidth issue ?
> >>> 
> >>>> From: mark.tinka at seacom.mu
> >>>> To: eng_mssk at hotmail.com
> >>>> Subject: Re: [c-nsp] Multicast Issue
> >>>> Date: Wed, 30 May 2012 08:18:57 +0200
> >>>> CC: cisco-nsp at puck.nether.net
> >>>> 
> >>>> On Wednesday, May 30, 2012 08:14:20 AM Mohammad Khalil
> >>>> wrote:
> >>>> 
> >>>>> Actually its
> > supposed for each stream to consume 8M
> >>>>> should i try to increase the speed limits configured ?
> >>>> 
> >>>> As this is VDSL, are you sure you're actually getting 24Mbps
> >>>> into the house?
> >>>> 
> >>>> We tested IPTv on VDSL using new copper across 50m - it was
> >>>> a disaster.
> >>>> 
> >>>> If you can, try increasing bandwidth and see if that helps.
> >>>> But it definitely sounds like when you request a 2nd stream
> >>>> and the picture develops block noise, you're starving the
> >>>> link of bandwidth.
> >>>> 
> >>>> Mark.
> >>> 
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> > 
> >       		 	   		  
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