[j-nsp] R: RE : multicast issue

Tue Jul 16 15:49:27 EDT 2013

If you can't start/stop manually mcast streams you will never have stable counters and can't detect packet loss. What you could do is to monitor customer mcast rate per (S,G) with the same snmp counters but it requieres you have constant bit rate for your (S,G). We have also this kind of script in perl which detects rate falling of (S,G) and triggers alarms when a given threshold is reach. It works very well for mcast TV channels (But you don't have the number of packet loss)

Best regards

Envoyé de mon iPad

Le 16 juil. 2013 à 21:14, "dim0sal" <dim0sal at hotmail.com<mailto:dim0sal at hotmail.com>> a écrit :

Hi roy
Good suggestions. Thanks.

Anyway we re not able to start monitoring mcast flows since we get by external sources.

We could perform the snmp get on the devices but since is not done in the same moment and routers are placed in different locations I expect the forwarded pkts will be different and the delta as well...

What do you think?

Inviato da Samsung Mobile

-------- Messaggio originale --------
Da: david.roy at orange.com<mailto:david.roy at orange.com>
Data:
A: R S <dim0sal at hotmail.com<mailto:dim0sal at hotmail.com>>,John Neiberger <jneiberger at gmail.com<mailto:jneiberger at gmail.com>>
Cc: juniper-nsp at puck.nether.net<mailto:juniper-nsp at puck.nether.net>
Oggetto: RE : [j-nsp] multicast issue

Hello,

We use mcast streams dedicated for multicast monitoring which are flooded to the entire network (some specific (S;G) ).  we are able to start / stop automatically these streams.
We developed a perl script which does :

While(1)
(

- Stop multicast "monitoring" streams
- Get via SNMP GET the forwarded packets for each (S;G) on every routers of the network (Multicast MIB gives per S;G forwarded packets
- Restart the streams
- Wait 1 hour
- Stop again streams
- Get again via SNMP GET the per (S;G) forwarded packets per routers
- compute the delta forwarded packet per node
- detect packet loss and alert via snmp trap / mail which nodes loss some packets
- Start the stream for 1 hour

)

Best reagrd
________________________________________
De : juniper-nsp [juniper-nsp-bounces at puck.nether.net<mailto:juniper-nsp-bounces at puck.nether.net>] de la part de R S [dim0sal at hotmail.com<mailto:dim0sal at hotmail.com>]
Date d'envoi : mardi 16 juillet 2013 18:55
À : John Neiberger
Cc : juniper-nsp at puck.nether.net<mailto:juniper-nsp at puck.nether.net>
Objet : Re: [j-nsp] multicast issue

Hi John
it's not a problem of how/why the packet lose, my concern is how can we monitor the multicast traffic hence our NOC is able to see the problem before the customer...
It's multicast coming from financial markets.

Tks

From: jneiberger at gmail.com<mailto:jneiberger at gmail.com>
Date: Tue, 16 Jul 2013 10:42:18 -0600
Subject: Re: [j-nsp] multicast issue
To: dim0sal at hotmail.com<mailto:dim0sal at hotmail.com>
CC: juniper-nsp at puck.nether.net<mailto:juniper-nsp at puck.nether.net>

What sort of multicast traffic is it? Is it a constant stream like voice or video or is it an intermittent feed like some sort of multicast messaging? If this is very low-rate traffic and intermittent, Juniper routers often drop the first packet because the multicast route has timed out of the forwarding table and it gets punted to the RE. If that is what is happening, there is a workaround. If you're losing traffic mid-stream, that's a different issue entirely.

John

On Tue, Jul 16, 2013 at 10:14 AM, R S <dim0sal at hotmail.com<mailto:dim0sal at hotmail.com>> wrote:

Hi all

Just a

brainstorming and your possible help.

I manage a

network where multicast is the most important traffic and sometimes I get issue

by customer where they state that some packets are lost…

Does

anybody have an idea or can help me in understanding a possible solution in

monitoring traffic in real time manner, maybe with the use of some software or appliance or whatelse.

In my idea

I could monitor traffic on the source and on the destination, then with  a sort of parsing understand if it’s my

network loosing the packets or not…

Any idea ?

suggestion ?

tks

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