Can CSS115XX have 2 service group with different upstream?

happyelfWong_2 · ‎07-23-2010

Hi,

Just to ask if CSS can support the architect that 2 service group with different upstream.

It seems if I set a default route then I can have only one upstream routing path.

Thanks.

Gilles Dufour · ‎07-25-2010

you can configure mulitple gateway/upstream.

The CSS by default select the correct route....the one that corresponds to the inbound request.

So, if request came in from upstream-A the response will be sent through that same upstream.

This behavior can be modified with the following command :

CSS11503-2(config)# ip ecmp ?
address             Choose among alternate paths based on IP addresses
no-prefer-ingress   Do not prefer the ingress port for the reverse path
                      egress
roundrobin          Alternate between equal paths in a roundrobin fashion
CSS11503-2(config)# ip ecmp

Gilles.

happyelfWong_2 · ‎07-25-2010

Hi Gilles,

Many thanks to your reply.

By the way, how to configure multiple gateway?

The original configuration has one gateway and applied a static default route to the original upstream like below:

ip route 0.0.0.0 0.0.0.0 172.23.2.2541

and thus direct the flow to only one upstream...

Do I need to remove the static default route?

Gilles Dufour · ‎07-25-2010

Simply added a 2nd static route for the 2nd upstream.

Gilles.

happyelfWong_2 · ‎07-25-2010

Hi Gilles,

Do you mean add static route and configure as below?

ip route 0.0.0.0 0.0.0.0 172.23.2.254 1

ip route 0.0.0.0 0.0.0.0 192.168.200.250 1

ip ecmp address

Thanks.

Gilles Dufour · ‎07-26-2010

correct.