Cisco Systems 1000 Series Manual De Usuario

releases in which each feature is supported, see the 

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Interworking is a transforming function that interconnects two heterogeneous attachment circuits (ACs). 
Several types of interworking functions exist. The function that is used depends on the AC type used, 
the type of data carried, and the level of functionality required. The two main Layer 2 Virtual Private 
Network (L2VPN) interworking functions supported in Cisco IOS XE software are bridged interworking 
and routed interworking.

Layer 2 (L2) transport over multiprotocol label switching (MPLS) and IP exists for ACs, such as 
Ethernet-to-Ethernet or Point-to-Point Protocol (PPP), Ethernet to VLAN, and Ethernet to Frame Relay. 
An interworking function facilitates translation between different L2 encapsulations.

L2VPN interworking works in either Ethernet (bridged) mode or IP (routed) mode. You can specify the 
mode by issuing the interworking {ethernet | ip} command in pseudowire-class configuration mode 
and in L2VPN xconnect configuration mode for protocol-based CLI.

The interworking command causes the ACs to be terminated locally. The two keywords perform the 
following functions: 

The ethernet keyword causes Ethernet frames to be extracted from an AC and sent over the 
pseudowire. Ethernet end-to-end transmission is resumed. The AC frames that are not Ethernet are 
dropped. In the case of VLAN, the VLAN tag is removed, leaving an untagged Ethernet frame.