Specifications

B-569
Cisco MWR 2941 Mobile Wireless Edge Router Software Configuration Guide, Release 12.2(33)MRB
OL-21227-02
Appendix B Cisco MWR 2941 Router Command Reference
xconnect
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 process changes when the ignore-vpi-vci keyword 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.
The xconnect command with the ignore-vpi-vci keyword results in the PVC mapping being done in a
cooperative way if the MWR works the same way as the receiving router. Without this command, the
MWR checks the VPI/VCI value inside the PW packet for matches against the local configured PVC or
PVC-mapping. With the ignore-vpi-vci keyword configured, the MWR ignores the VPI/VCI header
inside the received PW packet and does a blind rewrite with the local configured AC-side PVC's
VPI/VCI value. This process applies only to N:1 VCC PW with N=1 special case.
Examples The following example configures xconnect service for an ATM interface by binding the ATM circuit
to the PW named 123 with a remote peer 10.0.3.201. The configuration settings in the pseudowire class
named ATM-xconnect are used.
Router# config tby
Router(config)# interface ATM 0/0
Router(config-if)# xconnect 10.0.3.201 123 pw-class ATM-xconnect
Router(config-if-xconn)# exit
Router(config-if)# exit
Router(config)# exit
The following example illustrates PVC mapping using the ignore-vpi-vci keyword with the xconnect
command. The example shows both the MWR and remote end (7600) routers.
MWR:
Router# config t
Router(config)# interface ATM 0/0
Router(config-if)# pvc 0/10 12transport
Router(config-if-atm-12trans-pvc)# encapsulation aa10
Router(config-if-atm-12trans-pvc)#
xconnect 10.10.10.10 100 encapsulation mpls ignore-vpi-vci
Router(config-if-atm-12trans-pvc-xconn)# exit
Router(config-if-atm-12trans-pvc)# exit
Router(config-if)# exit
Router(config)# exit
7600:
Router# config t
Router(config)# interface ATM 0/0
Router(config-if)# pvc 2/20 12transport
Router(config-if-atm-12trans-pvc)# encapsulation aa10
Router(config-if-atm-12trans-pvc)# xconnect 20.20.20.20 100 encapsulation mpls
Router(config-if-atm-12trans-pvc-xconn)# exit
Router(config-if-atm-12trans-pvc)# exit
Router(config-if)# exit
Router(config)# exit