CSS Design issues

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Aug 13th, 2007
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I have 2 questions about Cisco CSS 11k appliances and its interconnextion in a network:

1. Is it possible to interconnect a firewall between the CSS and the Web servers so every Web server clusters would be in a different DMZ? If it is possible, do I have to terminate the SSL connexion at the CSS level?

2. All the information about RHI (Route Health Injection) I have found so far concern CSM on a 65k Catalyst; does it mean that RHI is not supported on a CSS? Is there any other alternative?

Thanks very much for your precious help.


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Diego Vargas Wed, 08/15/2007 - 06:08
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1. It should not be a problem as far as you can ensure that the traffic will flow back thru the CSS to avoid asymmetric flows, also you need to make sure to open all the ports for traffic flowing between the CSS and the server. Anyway this is not a common design and would need to be test it to see if would work fine for you.

2. Yes the CSS11500 series do support NHI for a VIP.

Here are the requirements:

1) RHI on CSS11500 is implemented using OSPF, pre-requisites for this feature


- Requires CSS11500 to have OSPF enabled globally

- Requires CSS11500 to be configured as ASBR 'ospf as-boundary'

- Use 'ospf advertise' command to advertise specific VIPs with /32 mask

- Requires OSPF to be enabled on Circuit connecting to neighbor router

- CSS VIP Master will advertise the VIP address, assuming all services and rule are active

Hope it helps!!


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