Re: Help in understanding cascading problem when using 5 MCUs and GnuGk

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Hi Pietro,

if your trace files are too large, I would either write a (Perl ?)
script to filter it down or search in it with an editor that can handle
large files.

If you still feel the sheer volume is too large, I would reduce the
trace level. No need to take the performance hit of a level 5 trace if
you don't use it.

Since manually unregistering the MCU helps, I would switch down to
trace level 3 for the next conference, so you can see all the RAS
messages and you can check why the MCUs aren't able to re-register.

Regards,
Jan

-- 
Jan Willamowius, Founder of the GNU Gatekeeper Project
EMail  : jan@xxxxxxxxxxxxxx
Website: http://www.gnugk.org
Support: http://www.willamowius.com/gnugk-support.html


pierlu wrote:
> Hi everybody.
> 
> I have to explain a bit before asking my question.
> 
> *This is the situation*
> When I'm doing large videoconferences I have to cacade more tha one
> MCU. These are the 5 MCUs I use:
> 
> A: Radvision  viaIp 400 20 ports
> B: Radvision Scopia 24 ports
> C: Radvision Scopia 24 ports
> D: Radvision Scopia 12 ports
> E: Tandberg 16 ports
> 
> Services are set to 4CIF@386kbps max. MCUs B, C and D accepts also
> CIF@384kbps and 4CIF@256kbps
> 
> Cascading is done this way D -> B <- A -> C <- E ( -> indicates the
> direction of the calls). So A is the master MCUs. Rooms are created by
> dialing in.
> 
> *This is the problem:*
> It happens seldomly, with no apparent trigger event, that during the
> conference MCUs B and C will completely fail. Clients connected to one of
> this MCUs will experience the following situation:
> 
> 1) first the audio will stop working. is lie conference is muted: this is
> the sign for me that the MCU is about to go down.
> 2) video will work nicely up until the call completely drops.
> 3) clients trying to dial in the room again  will get a denial and if me,
> who's managing the MCUs, tries to recreate the room, gets the message
> "Resource Unavalaible" from the MCUs boards, just like all of the usable
> ports are used up, but actually no one is connected cos connections are
> being refused (I cannot say whether they are refused by MCUs or by GnuGk
> nor I can say whether this happens on LRQs or ARQs, my fault but the log is
> too big to tell, read further).
> 
> *This is what I don't understand *
> Why do I have to unregister the MCU from the GnuGk with the unregisterip
> command via telnet interface to regain a full functional MCU? Only by doing
> so, media channels are newly avalaible and the MCUs will accept incoming
> calls. Of course the first times it happened I hard reset the MCUs to
> regain functionality, but in the end I discovered that its unregistration
> from the gatekeeper that solves the problem (btw TTL is set on 60 seconds).
> **
> *This is my question: do you think that, given the symptoms, fault is due
> to the interaction of GnuGk and the two MCUs or that is to blame only
> on the MCUs'? *
> Consider that those two MCUs do not have any problems when handling
> conferences on their own (without being cascaded, I mean).
> 
> I tried to debug GnuGk log, but I'm using trace level 5 and when cascading
> the log reports events for 80 clients and so it's pretty unreadable.
> Moreover, I have no clue to what to look for.
> 
> Next Monday I have another of this "big" videoconferences... do you have
> any suggestion on what to look if this happens again? (as I told you, this
> does not happen on a regular basis, it may not happen at all).
> 
> Excuse the long explanation, and the lack of GnuGk configuration to go
> along it, but I can provide them if you think you have a clue of what may
> be going on.
> 
> Thank you for your attention.
> 
>  Pietro Luigi Angelucci.


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