From: Simon Grace (SimonG@pcsystems.gr)
Date: Mon Oct 29 2007 - 14:41:51 ART
Hi Scott, tried to unicast you but email got bounced.
I sent my follow up just before your email came through.
I think you are right
Cheers,
Simon.
-----Original Message-----
From: Scott Vermillion [mailto:scott_ccie_list@it-ag.com]
Sent: Monday, October 29, 2007 7:30 PM
To: Simon Grace; ccielab@groupstudy.com
Subject: RE: FRTS - One one Subinterface
Hey Simon,
I've yet to do any serious QoS labs, so bear that in mind...
Having just read Odom's book on the subject, I'm thinking maybe this has
to
do with the tx ring (the hardware queue that all subinterfaces would
drain
into). Perhaps it's the case that you wouldn't want your voice getting
stuck behind large chunks from the other subinterfaces in the tx ring?
Something like that...
Regards,
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Simon Grace
Sent: Monday, October 29, 2007 10:25 AM
To: ccielab@groupstudy.com
Subject: FRTS - One one Subinterface
Hi Guys,
Scenario:
R4 has serial interface 1/4
It has two subinterfaces.
The multipoint goes to R1 and R2 with R4 being the HUB.
The point-to-point sub interface goes to R5.
Task is to set up FRTS going to R2 for voice.
Main interfaces is T1, connection between R2 is provisioned at 512kbps.
Remaining bandwidth is to be shared between the connection to R1 (the
other spoke) and R5 the other router on the point-to-point.
We are told that TC must be 10ms and to allow for fragmentation.
So 512000 for the connection to R2 leaves 1024000 divided by 2 = 512000.
So the CIR going to R2, R1 and R5 will be set to 512000.
Now the connection between R4 and R2 is carrying Voice traffic so we are
looking at Fragmentation and Tc of 10ms.
I'm cool with all that!
Now, question, do we need to alter the Tc and have fragmentation going
to R1 (the other spoke) and R5.
I don't think so, but the solution says yes.
Doing a show frame pvc on the pvc going to R2 show everything as it
should be, the two pvc's going to R1 and R5 have the default Tc which I
would expect.
As always, appreciate your comments,
Cheers,
Simon.
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