System information

Troubleshooting IBM 10-239
SDLC: Client Cannot Connect to Host over Router Running SDLLC
XID
2
not sent by router Step 1 With the debug sdllc and debug llc2 packet privileged exec commands enabled
on the router, check whether the router is sending XID frames to the FEP.
Caution: Because debugging output is assigned high priority in the CPU process,
it can render the system unusable. For this reason, use debug commands only to
troubleshoot specific problems or during troubleshooting sessions with Cisco
technical support staff. Moreover, it is best to use debug commands during
periods of lower network traffic and fewer users. Debugging during these periods
decreases the likelihood that increased debug command processing overhead will
affect system use.
Step 2 If the router is sending XID frames to the FEP, proceed to the next problem in this
table.
Step 3 If the router is not sending XID frames, use the show running-config privileged
exec command to view the router configuration. Make sure there is an sdllc xid
interface configuration command entry present.
Step 4 If the sdllc xid command is not configured on the router, add it to the
configuration. The following is the syntax for the sdlc xid command:
sdlc xid address xid
Syntax Description:
• address—Address of the SDLC station associated with this interface.
• xid—XID the Cisco IOS software will use to respond to XID requests the
router receives. This value must be 4 bytes (8 digits) in length and is specified
with hexadecimal digits.
Example:
The following example specifies an XID value of 01720002 at address C2:
interface serial 0
sdlc xid c2 01720002
FEP not replying to
XID
Step 1 With the debug sdllc and debug llc2 packet privileged exec commands enabled
on the router, check to see whether the FEP is replying to XID frames from the
router.
Step 2 If the FEP is responding, proceed to the next problem in this table.
Step 3 If the FEP is not responding, check the XID values configured by the sdllc xid
command on the router. The values for IDBLK and IDNUM on the router must
match the values in VTAM on the FEP. The following is the syntax for the sdlc
xid command:
sdlc xid address xid
Syntax Description:
• address—Address of the SDLC station associated with this interface.
• xid—XID the Cisco IOS software will use to respond to XID requests the
router receives. This value must be 4 bytes (8 digits) in length and is specified
with hexadecimal digits.
Example:
The following example specifies an XID value of 01720002 at address C2:
interface serial 0
sdlc xid c2 01720002
Step 4
Make sure that the XID information on the hosts is properly defined. If a 317X
device is a channel-attached gateway, the XID must be 0000000 for IDBLK and
IDNUM.
Host problem Check for activation, application problems, VTAM and NCP misconfigurations,
configuration mismatches, and other problems on the IBM host.
Possible Problem Solution