Can CSS115XX have 2 service group with different upstream?

Unanswered Question
Jul 23rd, 2010


  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.


I have this problem too.
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Gilles Dufour Sun, 07/25/2010 - 03:49

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
  roundrobin          Alternate between equal paths in a roundrobin fashion
CSS11503-2(config)# ip ecmp


happyelfWong_2 Sun, 07/25/2010 - 06:36

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

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

  Do I need to remove the static default route?

happyelfWong_2 Sun, 07/25/2010 - 09:06

Hi Gilles,

    Do you mean add static route and configure as below?

    ip route 1

    ip route 1

    ip ecmp address



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