CSS 1100 series Basics

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Jul 22nd, 2008
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Although we have implemented the CSS and also it is working , i still doubt about the CSS working :(.

We have used the default round-robin algorithm for load balancing between servers.

In this method does the load balancing takes place session wise ( session initiated by clients ) or does the CSS sends the IP packets coming from outside world to two internal server IP's just in a roung robin manner.

I tried to search on cisco.com but could not get the exact answer.

any link on ciso.com or ant other TCP / IP web link ? Or any book which can give me the correct answer ( Tanenbaum, Komer ,... ) please suggest.

Thanks in advance.


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4rmorris Fri, 07/25/2008 - 12:38
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The CSS load balances per flow, unless you tell it to do otherwise (i.e. sticky by source IP). HTTP flows tend to be pretty short. Once the web page has been received all the flows are closed and new flows will be created when the user clicks a link. The CSS cleans up inactive flows (garbage collection) pretty fast.

If you require stateful sessions, where one server must perform all the transactions for a session regardless of the number of flows, you should use the sticky features.

If you want to see if traffic is going both ways, try "show services summary"... you should see hits to both services. Another way would be to check the web server logs to verify hits on both servers.

Good luck,


sachinga.hcl Thu, 07/31/2008 - 10:48
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Hi Subodh,,

you can get some very good books for CSS as follows :

1. Designing Content Switching Solutions

by Zeeshan Naseh, CCIE No. 6838; Haroon Khan, CCIE No. 4530


Content Networking Fundamentals

Cisco Press

Author: Silvano Da Ros

You can get all versions of documents at this link at cisco site :


3. Cisco Internet Applications and Solutions Self-Study Guide: Cisco Internet Solutions Specialist by Michael Wilkes

ISBN13: 9781587052408

ISBN10: 1-58705-240-7

Publisher : Pearson Education


Content Delivery Networks: Web Switching for Security, Availability, and Speed by Scot Hull

Publisher : Mc Graw Hill

You can find troubleshooting notes on cisco website here:


you can also get some helpful referece configuration guide here:


Hope you might get some good stuff out of this.

In case of any new book I came to know, I would keep you posted for the same.

Keep posting.


Sachin garg

dpastor Fri, 08/08/2008 - 11:08
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If the traffic is coming in from the outside world, is it hitting a virtual IP(VIP)? If it is, and its port 80, it should use the round robin load balance per each request. You can configure other types of balancing by using the "advance balance" feature on the content rule.


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