Sorry to get off the Cisco subject......
If you are using the MS platform then you have 2 options; Microsoft Cluster Service (MCS) or Network Load Balancing Service (NLBS). MCS provides up to 4 nodes in a cluster with 1 or more shared disk subsystems. This is suited well for SQL or Exchange 2000 (email). The NLBS creates a Virtual IP and MAC address and allows up to 32 servers to participate in a NLBS cluster, best of all it is free (comes with Windows 2000 Advanced Server or NT 4 Enterprise Server). It work extremely well with IIS and DNS.
Just my 2 cents...
Patrick Greene
-----Original Message-----
From: Ejay Hire [mailto:[EMAIL PROTECTED]]
Sent: Friday, October 13, 2000 4:18 PM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: Re: High Availability. (Maybe OT)
>Problem, maintaing the same layer 3 address accross both switches in the
>advent that one link should fail, the server maintains reachability
Similar problem, the Layer 2 adresses have to be the same as well, or it
will not respond until the Arp-Cache timer expires.
Sounds like you need a Hardware cluster. 2 machines that appear as one
Virtual machine, have two redundant Network connections... These typically
use a Single storage subsytem, with redundancy built into it as well.
Assuming this isn't a hypothetical situation, when you get to this level of
redundancy, you need to consider physical location. I.e. You should
consider whether ot not to set all this up in a earthquake-prone flood zone
that might be hit with a tidal wave and was voted "Most Likely to be
destroyed in a Nuclear attack" by a major media publication.
$0.02
Ejay hire
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