How to have multiple subnets on outside of CSS
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07-30-2007 09:03 PM
For failover purposes we might want to have multiple routable /24 subnets at the outside of the CSS (facing the Internet.) But I understand that if you put a secondary IP address on a circuit/VLAN associated with an interface - the CSS will not be able to balance the secondary. Most of the configuration examples only go into having a single subnet at the outside and a single subnet on the inside. How could I have multiple subnets at the outside? Thanks.
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07-31-2007 01:18 AM
you can add more interfaces on the outside, and have a different subnet/vlan for each interface.
You can also use a single interface in trunk mode.
No need for secondary ip addresses.
However, this kind of config is more complex since traffic can come in on 1 interface and go out on another one.
It is better to put a single interface between CSS and servers vlan and another single interface between css and an external router which will have a connection to all your vlans if needed.
Let a router do the routing and the css do the loadbalancing.
Gilles.
