I have lab tested all the devices that you have mentioned in here. the best of the lot is from a company called Alteon Web sytems. That equipment is terrific. If you go to their website, you can pull out some white papers. I can send u some lab results on these if u so desire. -----Original Message----- From: Kevin Welch [EMAIL PROTECTED] Sent: Sat, 14 Oct 2000 00:07:43 -0700 To: [EMAIL PROTECTED], [EMAIL PROTECTED] CC: [EMAIL PROTECTED] Subject: Re: High Availability. (Maybe OT) 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: > > >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] _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___________________________________________________________________________ Visit http://www.visto.com/info, your free web-based communications center. Visto.com. Life on the Dot. _________________________________ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
