Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 
New Member

CSS 11503: VIP redundancy, load balancing, failover

Dear Pros!

I'd like to ask for your help in order to validate a design of mine concerning the deployment of two Cisco CSS 11503 switches for load balancing, failover, and high availability.

Currently I am at the very first phase of this deployment and the layer 2 parameters of both CSS switches have already been configured and it is fully functional. The next step will be the load balancing and failover scenarios and I've a question about whether it can be done or not.

Please review the attachments in order to understand what the scenario deployment looks like.

The scenario description is as follows:

- There are two Cisco CSS 11503 switches

- There are three backend Servers

- These servers run the end customer application + an Oracle (Timesten) database

- Each server has the same content and the Oracle databases are fully synchronized

So how things are supposed to work? Let's see:

1) The high availability between the two Cisco CSS will be Active/Standby. This includes VIP redundancy and Virtual Interface Redundancy

2) The end users will communicate with the VIP that represents the application, initiating the connections to that VIP.

3) The active CSS will handle the request from the end user and will load balance (round-robin) the requests to one of the three available servers.

4) The server on the other hand will initiate a connection to the database, which might be its own copy of Oracle/Timesten or not (it depends on which of the three servers is holding the “master” role).

5) So, therefore, the connection from the application to the database will be made through a second VIP and the Cisco CSS 11503 switches must NOT load balance in this case, since it could corrupt the entire database.

The following summarizes what we need to accomplish our goals: there will be two VIP addresses (one for the application and the second for the database), loadbalancing for the application VIP only, failover for the database VIP, and virtual redundancy to provide the servers with default gateway high availability.

I'm enclosing the initial configuration. I still need to insert the rest of the configuration parameters to fulfill my project's objectives. In order to do that, my questions are:

- How can I prevent the CSS switches from load balancing the requests from the application to the database? Load balancing must NOT occur as per the design's requirements.

- Since load balancing cannot be done, how would the CSS switches provide failover services in case of issues with the database on the master server?

I look forward to hearing from you soon.

Big thanks in advance!!



Re: CSS 11503: VIP redundancy, load balancing, failover

Hi Leo,

As the config requires lot of discussion as the forum is limited to 4000 letters so I am sending you some really good links.

Here is the URL for the configuration for the Configuring VIP and Virtual IP Interface Redundancy follow the configuration guide which may help you

Configuring Box to box redundancy:

CSS 11500 Active-Active Stateful Failover ASR in One-Armed Mode Configuration Example

Box-to-Box Redundancy on the CSS 11xxx Configuration Example - Ciscowiki

Kindly find full range of configuration examples on CSS here :

Cisco CSS 11500 Series Content Services Switches

Configuration Examples and TechNotes

Cisco CSS 11500 Series Content Services Switches

Kindly see URL given below for my other articles

Still you want to discuss some thing in this regard then kindly mail me at for any further discussion.

If possible plz rate so that I can be helpful to other people also as it will enhance my credibility.


CreatePlease to create content