Cisco 10000-2P2-2DC Software Guide - Page 449
Configuring L2VPN Interworking, Bridged Interworking
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21 C H A P T E R Configuring L2VPN Interworking Interworking is a transforming function that is required to interconnect two heterogeneous alternating currents (ACs). Several types of interworking functions exist. The function that is used would depend on the type of ACs being used, the type of data being carried, and the level of functionality required. The two main L2VPN interworking functions supported in Cisco IOS Software are bridged and routed interworking. Layer 2 transport over MPLS and IP already exists for like-to-like attachment circuits, such as Ethernet-to-Ethernet or PPP-to-PPP. L2VPN Interworking builds on this functionality by allowing disparate attachment circuits to be connected. An interworking function facilitates the translation between different Layer 2 encapsulations. In earlier releases, the Cisco 10000 series router supported only bridged interworking, which is also known as Ethernet interworking. However, from Cisco IOS Release 12.2(33)XNE, the Cisco 10000 series router also supports routed interworking. This chapter describes the following L2VPN interworking features: • Bridged Interworking • Routed Interworking Bridged Interworking Bridged interworking is used when Layer 2 (L2) packets are considered without regard for Layer 3 contents. No routing participation by the Internet Service Provider (ISP) exists. In Cisco IOS Release 12.2(33)SB, the Ethernet (port) over MPLS pseudowire is supported for bridged interworking. Therefore, this type of interworking function is also called Ethernet Interworking. In bridged interworking, Ethernet frames that are extracted from the attachment circuit (AC) are sent over the MPLS pseudowire. In the case of 802.1 Q AC, the VLAN tag is removed. The pseudowire functions in the Ethernet (VC type 0x0005) like-to-like mode. The interworking function at the Native Service Processor (NSP) performs the required adaptation based on AC technology. Non-Ethernet frames are dropped. The following bridged interworking features are explained in the chapter: • Ethernet to VLAN-Bridged Interworking, page 21-2 • Ethernet/VLAN to ATM AAL5 Interworking, page 21-5 • Ethernet/VLAN to Frame Relay Interworking, page 21-17 • Verifying L2VPN Interworking, page 21-30 OL-2226-23 Cisco 10000 Series Router Software Configuration Guide 21-1
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