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New Member

CSS Routing question

I am fairly new to the CSS (having worked with CSMs for several years now), I currently inherited a CSS that has two VLANs defined (VLAN1 & VLAN234), VLAN1 is connected to the IP network on interface e12, VLAN234 is connected to the network on interface e1. The CSS has a default route "ip route 1".

I am seeing traffic inbound to the CSS destined for 167.19.248.x virtual addresses on the switch over interface e12, the return traffic is being sent over e1 (the incoming/outgoing 167.19.234.x traffic is over e1). Everything is working fine, and has for quite some time, but I'd like the traffic to go out the same interface it came in.

What are my options? If I add another default route "ip route 1", will the .248 traffic go back out the same interface it came in? Do I need a default route at all?


  • Application Networking
Cisco Employee

Re: CSS Routing question

if the CSS has 2 equal routes for the same destination, it will select the one on which traffic came in.

So, your solution is to indeed configured 2nd static route matching the first one and pointing out the 2nd interface.


New Member

Re: CSS Routing question

Is it valid for ICMP packets as well?