Cisco 3825 Software Configuration Guide - Page 266

xconnect Appendix A Cisco 3825 Mobile Wireless Edge Router RAN-O Command Reference l2transport configuration (for ATM) Connect configuration mode Global configuration Command History Release 12.0(23)S 12.0(28)S 12.3(2)T 12.2(25)S 12.2(27)SBC 12.4(11)T 12.4(12)MR2 Modification This command was introduced. Support was added for Multilink Frame Relay connections. This command was integrated into Cisco IOS Release 12.3(2)T. This command was integrated into Cisco IOS Release 12.2(25)S. This command was integrated into Cisco IOS Release 12.2(27)SBC. This command was integrated into Cisco IOS Release 12.4(11)T. This command was integrated into Cisco IOS Release 12.4(12)MR2. Usage Guidelines The combination of the peer-ip-address and vcid arguments must be unique on the router. Each xconnect configuration must have a unique combination of peer-ip-address and vcid configuration. Note If the remote router is a Cisco 12000 series Internet router, the peer-ip-address argument must specify a loopback address on the router. The same vcid value that identifies the attachment circuit must be configured using the xconnect command on the local and remote PE router. The vcid creates the binding between a PW and an attachment circuit. The pw-class pw-class-name value binds the xconnect configuration of an attachment circuit to a specific pseudowire-class. In this way, the pseudowire-class configuration serves as a template that contains settings used by all attachment circuits bound to it with the xconnect command. Note If you specify the encapsulation keywords, you must specify the pw-class keyword. Keyword ignore-vpi-vci Using the xconnect command with keyword ignore-vpi-vci provides benefits over using the pw-pvc command for PVC mapping. Originally, PVC mapping was done through the pw-pvc pw-vpi/pw-vci command. When the MWR received the MPLS PW packet, it decoded the PW payload and looked up the PW VPI/VCI value to see if it matched any local configured PVC values. If a match was made, the PW-VPI/PW-VCI was translated to the AC-side VPI/VCI and the cell was sent to the local PVC. Without a match, the MWR dropped the received PW packet. When the MWR generated the PW packet, it used configured pw-vpi/pw-vci values. In this case, the PVC mapping was done completely on the MWR and was transparent to the remote end. The scenario differs when keyword ignore-vpi-vci is configured. For N:1 with N=1 special case, when the PW packet is received from the MWR, the receiving router ignores the VPI/VCI value contained in the PW payload. It does a blind rewrite to use the AC-side VPI/VCI and sends the cell to the AC side PVC. A-134 Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide OL-15667-03