From: Lord, Chris (chris.lord@lorien.co.uk)
Date: Wed Feb 09 2005 - 13:26:14 GMT-3
Hi Guys,
I would be interested to know if anyone has any practical experience of
deploying a distributed Call Manager cluster across a wide area network?
Basically I'm looking at a situation with 5 sites, 100 users at each
site, connected via an MPLS cloud, there is one publishing CM and 4
subscribing CM's. My question is, does anyone know how to calculate the
WAN bandwidth requirements (real time skinny plus SQL replication) for
reliable cluster operation given that we have a measured
callrate-per-hour for each site.
The official Cisco answer is about 7.5 Mbps at the publishing site and
about 4 Mbps for each subscribing site - my instinct and observation of
the actual network would suggest a lot less is required!!!
The key issue here is whether the cluster will become unstable and
unreliable if the WAN bandwidth is less than the theoretical guidelines
which I believe are based on an assumed call-rate of 10k per hour which
is far higher than the rates involved in this scenario? I could pro-rata
the figures down but I don't know whether that is a valid approach.
Many thanks i.a.,
Chris
CCIE #13925
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