Actually Cisco has a Content Caching Switch (CSS Something for the model)
That is a very nice unit, they are a variety of different sizes, and the
entry price is comparable to a LocalDirector. The Content Switch, will
allow you to be alot more granular in traffic forwarding.
-- Kevin
----- Original Message -----
From: "Brian" <[EMAIL PROTECTED]>
To: "Priscilla Oppenheimer" <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Friday, October 13, 2000 1:08 PM
Subject: Re: High Availability. (Maybe OT)
> On Fri, 13 Oct 2000, Priscilla Oppenheimer wrote:
>
> > Who makes Layer 4 switches such as what you're talking about, Brian?
Sorry
> > if it's a dumb question.
>
> Foundry Networks www.foundrynet.com we use the serverion line.
> Alteon Networks www.alteon.com makes good ones too (acedirector line)
>
> Cisco makes one called the localdirector I believe as well. I think F5
> has some too. Foundry IMHO is the way to go. Very nice. We use them for
> Server Load Balancing and Transparent Redirection (cache farms)
>
> >
> > 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!)
> >
>
> Feel free to ask for any more details,
>
> Brian
>
> > 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)
> > >
> > >_________________________________
> > >FAQ, list archives, and subscription info:
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> >
> >
> > ________________________
> >
> > Priscilla Oppenheimer
> > http://www.priscilla.com
> >
> > _________________________________
> > FAQ, list archives, and subscription info:
http://www.groupstudy.com/list/cisco.html
> > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
> >
>
> -----------------------------------------------
> Brian Feeny, CCNP, CCDP [EMAIL PROTECTED]
> Network Administrator
> ShreveNet Inc. (ASN 11881)
>
> _________________________________
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> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
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