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)
> >
> >_________________________________
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> >http://www.groupstudy.com/list/cisco.html
> >Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
>
> ________________________
>
> 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)
_________________________________
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
