Catalyst 2960-S 及び Catalyst 2960 では、これまで IP ルーティングはサポートされておりませんでしたが、様々な制約があるものの、12.2(55)SE以降のIOSで IP ルーティングのサポートが開始されました。
以下のURLもご参照ください。
Catalyst 2960 and 2960-S Software Configuration Guide, 12.2(55)SE
Configuring Static IP Unicast Routing
http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_55_se/configuration/guide/swipstatrout.html
Release Notes for the Catalyst 3750, 3560, 2975, 2960-S, and 2960 Switches, Cisco IOS Release 12.2(55)SE and Later
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_55_se/release/notes/OL23054.html#wp1043999
Cisco IOS Software Release 12.2(55)SE for Cisco Catalyst 3750-X, 3560-X, 3750-E, 3560-E, 3750, 3560, 2975, 2960, and 2960-S Series Switches; Cisco Catalyst 3750V2 and 3560V2 Switches; Cisco Industrial Ethernet 3000 Series Switches; and Cisco Catalyst Blade Switch 3000 and 3100 Platforms
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps8802/ps6969/ps5012/product_bulletin_c25-614546_ps6406_Products_Bulletin.html
