RE: IMC fault tolerant method

  • From: "Neil Hobson" <Neil.Hobson@xxxxxxxxxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Thu, 21 Aug 2003 09:36:47 +0100

The IMC is rubbish for this.  It's an EDK gateway and not a true
connector; as a result, the MTA always sees the IMC as 'up' or
'available', and will continue to route messages to it even if the
service is down.  Worse still, once the MTA has put the messages into
the queue, no re-routing will take place - the MTA considers its job
The options I can think of:
1. Implement a cluster for the IMC on a dedicated bridgehead server.
We've done this for some customers, and it does work well.  But it does
add cost, complexity, etc, to the environment.
2. Implement a warm standby server for your IMC server, which covers for
the failure of the system backplane, etc.
3. Upgrade to Exchange 2000, and use the SMTP service there, which
includes superior link state checking, etc.


From: Rich Tibbets [mailto:rtibbets@xxxxxxxxxxxxxxxx] 
Sent: 19 August 2003 18:14
To: [ExchangeList]

Hi all, 


I have a single site organization consisting of five exchange 5.5 SP4
servers.  Two of the server has IMC Connectors.  What I am trying to do
is have fail over in the event that one of the IMC circuits goes dead.
The setup on the address space currently is server1 cost:1, server two
cost:10. I have a couple questions:


1. Is their anyway to automate this so traffic can be routed
automatically when there is a circuit failure?

2. Is their any procedure to re-route email already sitting in the


I have read that even with a circuit going dead the IMC is still
accepting traffic and will be queued until it can deliver the messages
or reach its time out value.   


I did search for an answer and found references to how the IMC functions
but no clear answers on clearing the queue or for a better way of
setting up the site.


Thanks for any help on this.



Rich Tibbets, MCSE

Network Administrator

National Corporate Research


Mobil: 302.670.5688

Fax: 212.564.6083

rtibbets@xxxxxxxxxxxxxxxx <mailto:rtibbets@xxxxxxxxxxxxxxxx> 

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