Can the CSS 11500 do this?

Unanswered Question
Sep 24th, 2009
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I'm not sure if I'm posting in the correct area. We don't have a CSS yet, but I was asked this morning if it could do this:

Currently we run web pages over port 80 on two servers. These web pages depend on two other servers on the back end that run on port 81.

What they want to do is be able to monitor port 81 (Domino server), and if port 81 isn't available, move all traffic to the other server on port 80. So it looks like this:

80 80

| |

v v

81 81

If port 81 doesn't respond, then the port 80 associated to it won't work correctly. Is the CSS able to do this? If not, what other devices would you recommend?



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Gilles Dufour Thu, 09/24/2009 - 22:02
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yes the CSS can do this with its probe mechanism.

You can send a true http request to the port 80 server, just like a normal user, and if we don't get response because the backend server on port 81 is not down, we will consider the port 80 server as down and we will stop sending traffic to it.

You can also querry directly the port 81 server and disable its associated port 80 when necessary.

You could also loadbalance the request to the port 81 servers....

Plenty of solutions here.

I would like also to mention that we have a new loadbalancers in the ACE c4710.

It comes with the same features as the CSS and much more.



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