Hello,
Yes, you can create a default route-map rule that catches all packets that
do not match specific rules. Then it will go via the regular routing
process. When you are using 3750, please make sure that you are running at
least IPServices image with your SDM template set to routing.
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/1
2.2_35_se/configuration/guide/swiprout.html#wp1228588
Hope this helps.
Regards,
NT