Configuring Local ATM Cross-Connects with AAL5 Encapsulation

To create a local cross-connect between two ATM 1483 subinterfaces on the same router, you create a loopback interface, configure your ATM PVCs, and then create an MPLS relay connection from the PVCs to the loopback interface. You do not need to configure any other MPLS commands.

The following commands create an ATM cross-connect between two ATM subinterfaces on the same router.

Note: Although this procedure uses AAL5 encapsulation to configure a local cross-connect between two ATM 1483 subinterfaces within the same router, you can also use AAL5 encapsulation when you configure an MPLS pseudowire (tunnel) connection between two ATM VCCs on different routers.

1. Create a loopback interface. All local cross-connects can share the same loopback interface.
   host1(config)#interface loopback 0 host1(config-if)#ip address 10.1.1.1 255.255.255.255 host1(config)#exit
2. Create an ATM 1483 subinterface and ATM PVC with aal5all encapsulation on the ingress interface.
   host1(config)#interface atm 2/0.1 host1(config-subif)#atm pvc 1 0 100 aal5all
3. Create an MPLS relay connection to the loopback interface. Include the address of the loopback interface and a VC ID.
   host1(config-subif)#mpls-relay 10.1.1.1 2 host1(config-subif)#exit
4. Create an ATM 1483 subinterface and ATM PVC with aal5all encapsulation on the egress interface.
   host1(config)#interface atm 2/0.2 host1(config-subif)#atm pvc 2 0 101 aal5all
5. Create an MPLS relay connection to the loopback interface. The VC ID must be the same on both sides of the connection.
   host1(config-subif)#mpls-relay 10.1.1.1 2 host1(config-subif)#exit
6. (Optional) Display your configuration.

   host1#show mpls cross-connects atm
                                                     Cate Peak
   Interface  VPI VCI Interface  VPI VCI VC-ID Encap gory Rate  Status
   ---------- --- --- ---------- --- --- ----- ----- ---- ---- --------
   ATM2/0.1     0 100 ATM2/0.2     0 101     2 AAL5  UBR     0 State UP
   1 local connection(s) found