Cisco Cisco IOS Software Release 12.2(27)SBC
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Layer 2 Local Switching
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:
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
switching—on the Cisco Series 12000 router Engine 3 linecards. For information about how to configure
cell-packing, see
Any Transport over MPLS
.
Feature History of Layer 2 Local Switching
Release
Modification
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.
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:
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