From: Menga, Justin (Justin.Menga@xxxxxxxxxx)
Date: Sun Nov 18 2001 - 19:13:51 GMT-3
Hi,
If you look at a circuit with just SCR (no PCR), the MBS is the maximum
number of cells that can be sent per time measurement interval, and is
identical to Bc in relation to CIR for Frame Relay.
For example, if your SCR is 1000 cells/sec and your MBS is 50 cells,
that you can send 50 cells per 50 milliseconds (which works out to 1000
cps). The burst size means you can send 50 cells at the access rate of
the line before waiting until the next time measurement interval (t +
50ms).
Typically you should set your MBS to the MTU of data packets in your
network. A common value is 96 (96 x 48 bytes = 4608 bytes) which allows
for 3 x data MTU (1500 bytes) for Ethernet.
A good URL is http://www.cisco.com/warp/customer/121/atm_vbrshape.shtml
but you'll need CCO access.
Regards
Justin Menga CCIE#6640 CCDP CCNP+Voice+ATM MCSE+I CCSE
Network Solutions Architect
Wireless & E-Infrastructure
Compaq Computer New Zealand
DDI: +64-9-918-9381 Mobile: +64-21-349-599
mailto: justin.menga@compaq.com
web: http://www.compaq.co.nz
-----Original Message-----
From: Murphy, Brennan [mailto:Brennan_Murphy@NAI.com]
Sent: Monday, 19 November 2001 10:02 a.m.
To: 'ccielab@groupstudy.com'
Subject: VBR-NRT MBS?
How does MBS related to SCR/PCR on an ATM pvc?
I think I understand SCR/PCR but I'm having trouble
with MBS. I've browsed CCO but having a tough
time understanding some of the short 1 sentence
descriptions of MBS. Any help is appreciated.
Thanks!
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