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Multicast Issue

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eng_mssk at hotmail

May 29, 2012, 10:15 PM

Post #1 of 7 (645 views)
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Multicast Issue

Hi all , i have CPE that terminates VDSL connection with a downstream of 24M
The CPE receives Multicast streams to serve two televisions
The network is all layer 2 connections
When serving one television , all is working good but when two are in service the picture is stuck as if the multicast traffic is stopped or something
Any ideas?

Thanks

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mark.tinka at seacom

May 29, 2012, 10:25 PM

Post #2 of 7 (598 views)
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Re: Multicast Issue [In reply to]

On Wednesday, May 30, 2012 07:15:28 AM Mohammad Khalil
wrote:

> Hi all , i have CPE that terminates VDSL connection with
> a downstream of 24M The CPE receives Multicast streams
> to serve two televisions The network is all layer 2
> connections
> When serving one television , all is working good but
> when two are in service the picture is stuck as if the
> multicast traffic is stopped or something Any ideas?

Sounds like you're asking too much from the link.

How much bandwidth does a single stream consume?

Mark.
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eng_mssk at hotmail

May 29, 2012, 11:14 PM

Post #3 of 7 (595 views)
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Re: Multicast Issue [In reply to]

Actually its supposed for each stream to consume 8M
should i try to increase the speed limits configured ?

> From: mark.tinka [at] seacom
> To: cisco-nsp [at] puck
> Subject: Re: [c-nsp] Multicast Issue
> Date: Wed, 30 May 2012 07:25:01 +0200
> CC: eng_mssk [at] hotmail
>
> On Wednesday, May 30, 2012 07:15:28 AM Mohammad Khalil
> wrote:
>
> > Hi all , i have CPE that terminates VDSL connection with
> > a downstream of 24M The CPE receives Multicast streams
> > to serve two televisions The network is all layer 2
> > connections
> > When serving one television , all is working good but
> > when two are in service the picture is stuck as if the
> > multicast traffic is stopped or something Any ideas?
>
> Sounds like you're asking too much from the link.
>
> How much bandwidth does a single stream consume?
>
> Mark.

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mark.tinka at seacom

May 29, 2012, 11:18 PM

Post #4 of 7 (596 views)
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Re: Multicast Issue [In reply to]

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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eng_mssk at hotmail

May 29, 2012, 11:29 PM

Post #5 of 7 (596 views)
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Re: Multicast Issue [In reply to]

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
> To: eng_mssk [at] hotmail
> Subject: Re: [c-nsp] Multicast Issue
> Date: Wed, 30 May 2012 08:18:57 +0200
> CC: cisco-nsp [at] puck
>
> 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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mark.tinka at seacom

May 30, 2012, 12:02 AM

Post #6 of 7 (597 views)
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Re: Multicast Issue [In reply to]

On Wednesday, May 30, 2012 08:29:13 AM Mohammad Khalil
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 ?

Your IPTv traffic will flow downstream, from the Receiver PE
router. So the 4Mbps upstream traffic won't have any
bearing, as IGMP Join messages (which travel upstream) are
low bandwidth anyway.

The real question is, even though you've configured for
24Mbps downstream, can you actually get that?

Mark.
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matt at mcadory

May 30, 2012, 9:44 PM

Post #7 of 7 (579 views)
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Re: Multicast Issue [In reply to]

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> 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
>> To: eng_mssk [at] hotmail
>> Subject: Re: [c-nsp] Multicast Issue
>> Date: Wed, 30 May 2012 08:18:57 +0200
>> CC: cisco-nsp [at] puck
>>
>> 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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> https://puck.nether.net/mailman/listinfo/cisco-nsp
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