Possible Problem Solution

Address mapping error Step 1 Use the show running-config privileged exec command to view the configuration of the router.

Step 2 Depending on your PSN environment, look for any x25 map ipx, frame-relay map ipx1, or smds static-map ipx interface configuration command entries in the router configuration.

Make sure the address mapping specified by these commands is correct:

• For X.25, address mapping maps host protocol addresses to the host's X.121 address.

• For Frame Relay, address mapping maps a next hop protocol address and the DLCI2 used to connect to the address.

• For SMDS3, address mapping defines static entries for SMDS remote peer routers.

For more information about configuring address maps, refer to the Cisco IOS Wide-Area Networking Configuration Guide and Wide Area Networking Command Reference.

Encapsulation mismatch Step 1 Use the show interfaces privileged exec command to determine the encapsulation type being used (such as X.25, Frame Relay, or SMDS encapsulation). Look for output similar to the following:

Serial0 is up, line protocol is up Hardware is MCI Serial

Internet address is MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255

Encapsulation FRAME-RELAY, loopback not set, keepalive set (10 sec) Step 2 If an encapsulation command is not present, the default is HDLC4

encapsulation. For PSN interconnection, you must explicitly specify the proper encapsulation type (such as encapsulation x25 for an X.25 connection).

Configure the proper encapsulation type and use the show interfaces command to verify that the encapsulation type is correct.

Use the show frame-relay map exec command on the hub router to see the Frame Relay map assignments currently configured.

Check each Frame Relay map statement to ensure that the DLCI assignments are correctly configured. Make sure you use the DLCIs obtained from your Frame Relay provider. Remember that DLCI values are locally significant.

Misconfigured DLCI Step 1

assignments (Frame Relay only)

Step 2

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