The MPLS-OPS Archive

[Geoff Bennett <geoff.bennett@marconi.com>]

Hi Danny,

I'm with Robin here...

I think it would be unwise to run anything other than AAL5, packet-based
services on a CoS network because CoS is probablistic.  In other words, CoS
improves your chances that no contention will occur, but does not eliminate
them.

Non-packet services are likely to carry with them a high availability
requirement, and so loss of service due to that "once a month" congestion
problem will be significant.  One session-loss will blow your uptime
numbers for the year, and some operations folks are paid bonus on uptime
numbers :-)

Cheers,
Geoff






At 09:55 17/03/01 -0700, Danny McPherson wrote:
>
>
>> I trust their delay and jitter requirements are low if they propose using
>> CCC seriously? 
>
>Why?
>
>> ie they dont require circuit based services that are not
>> tolerant of even small delay variation.
>
>Why not, IP or MPLS with the appropriate CoS-based QoS (or NONE 
>if there's no contention in the network) can provide these 
>services?
>
>-danny
>
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Geoff Bennett                             Tel: (33) 497 21 43 62
Director, Office of the CTO               Fax: (33) 497 21 43 50
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