Cisco Cisco IOS Software Release 12.2(27)SBC

Copyright © 2006 Cisco Systems, Inc. All rights reserved.

The Layer 2 Local Switching feature allows you to switch Layer 2 data between two interfaces on the 
same router, and in some cases to switch Layer 2 data between two circuits on the same interface port. 
The interface-to-interface switching combinations supported by this feature are:

ATM to ATM

ATM to Ethernet

ATM to Frame-Relay 

Ethernet to Ethernet VLAN

Frame Relay to Frame Relay (and since 12.0(28)S, also to Multilink Frame Relay)

The same-port switching feature introduced with Release 12.0(30)S supports the following:

Same-Port Switching for ATM (PVC and PVP)

Same-Port Switching for Ethernet VLAN

Same-Port Switching for Frame Relay

Beginning with Cisco IOS Release 12.0(30)S, cell packing is available during ATM VP or VC local 
switching—on the Cisco Series 12000 router Engine 3 linecards. For information about how to configure 
cell-packing, see 

Any Transport over MPLS

.

12.0(27)S

The feature was introduced on the Cisco 7200 and 7500 series routers.

12.2(25)S

The feature was integrated into Cisco IOS Release 12.2(25)S.

12.0(30)S

Same-port switching was added. Support for that and for local switching between 
interfaces was also added for Cisco 12000 series routers.

12.2(28)SB

This feature was updated to include NSF/SSO support on the Cisco 7500 series 
routers for the following local switcing types: 

NSF/SSO—Ethernet to Ethernet VLAN Local Switching Support

NSF/SSO—Frame Relay to Frame Relay Local Switching Support