[cisco-voip] Quick failover and SRST

[Go0se]

"most of the reading I have done implies about 40 seconds is required to
recognize failure of the primary, and initiate handoff to the subscriber." -
if I am reading correctly, you are talking about failover from the publisher
callmanager to the subscriber callmanager.  If this is the case typically
it's much faster than 40 seconds It's a matter of a few seconds. It depends,
however, on what all you have.

 

As a side note, Cisco recommends when you have more than one callmanager
that you "home" your phones to the subscriber during normal operations and
then allow the phones to failover to the publisher if the subscriber fails.
Having the phones run off of the subscriber reduces the workload on
publisher resources.

 

"should I keep SRST now that I will have redundant CMs?" - What is the
likelihood that any building could lose connectivity to both CMs at the same
time? If it is possible then your answer is yes. If you already have SRST it
won't hurt anything to leave it in place.

 

Thanks,

 

Go0se

 

My blog:

http://atc.go0se.com

 

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From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of David Zhars
Sent: Sunday, December 12, 2010 9:28 AM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Quick failover and SRST

 

We have 7 buildings all connected via fiber.  Each building has a 2801 for
SRST and 911 handling.

As an upgrade, we are going to install a redundant CM (version 8.x).  I have
one site that needs quick failover, and most of the reading I have done
implies about 40 seconds is required to recognize failure of the primary,
and initiate handoff to the subscriber.  I know there are some settings to
speed this up as well.

My quesiton is, should I keep SRST now that I will have redundant CMs?
Could they somehow assist in that 40 second timeframe, or are they sort of
the subscriber when you don't have a redundant CM?  What would I gain by
keeping SRST with a redundant CM?  

And I'm just curious, but how does Cisco license the redundant CM?  Same
prices and maintenance as a regular CM?

thank you!

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