Who makes Layer 4 switches such as what you're talking about, Brian? Sorry
if it's a dumb question.
I'm helping a customer who has a setup similar to what you describe, I
think. The customer is reluctant (unable?) to give me all the details, even
though I'm helping him troubleshoot some problems that are probably
related. (Layer 8, politics, will get you every time!)
Thank-you for your help.
Priscilla
At 08:30 AM 10/13/00, Brian wrote:
>Using Server Load Balancing on switches. Then between the switches you
>run a hot standby protocol. For example:
>
>The ip the clients use for the server would really be a "virtual" ip
>address, which is actually bound to the layer4 switch. The layer 4 switch
>receives requests for the application (lets say port 80) and then load
>balances accross a server farm using a hash table. If servers die......it
>can handle this, because it does health checks to the servers. If the
>switch dies, then hot standby kicks in and another switch is activated.
>
>Even "session" level stuff like cookies and whatnot can be handled by
>these switches, to make sure your session stays on the same server.
>
>Other applications like databases etc, have similar scenerios. Normally
>in the above scenerio, you backend all the servers off a single file
>server so that the data is the same on all servers (NFS). This file
>server would be a high reliable server such as a NetApp
>
> >
>
> >
> > Problem, maintaing the same layer 3 address accross both switches in
> > the advent that one link should fail, the server maintains
> > reachability.
>
>
>
> >
> > Giving that in this case I would be talking about a solaris system, I
> > have thought about using simple scripts to watch for the interface to
> > go down and reconfigure. I am curious if anyone knows of any
> > hardware/software solutions for doing this? I am guessing that I am
> > not the first person to ask for something like this.
>
>Brian
>
>
> >
> > -- Kevin
> >
>
>-----------------------------------------------
>Brian Feeny, CCNP, CCDP [EMAIL PROTECTED]
>Network Administrator
>ShreveNet Inc. (ASN 11881)
>
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________________________
Priscilla Oppenheimer
http://www.priscilla.com
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