Table of Contents

X.25 Cause and Diagnostic Codes

X.25 Cause and Diagnostic Codes

X.25 Cause and Diagnostic Codes

This appendix covers the X.25 cause and diagnostic codes, as referred to in the debug x25 all command of the "Debug Commands" chapter. For more information on these codes, see the 1984 ITU-T X.25 Recommendation.

Note The ITU-T carries out the functions of the former Consultative Committee for International Telegraph and Telephone (CCITT).

Note The router reports the decimal value of a cause or diagnostic code, whereas other X.25 equipment may report these codes in hexadecimal notation. For this reason, this appendix lists both the decimal and hexadecimal values of the cause and diagnostic codes.

Table A-1 describes the differences between our implementation of certain X.25 network-generated, "international problem" diagnostic fields and the definitions provided in Annex E of ITU-T Recommendation X.25. The Annex E Table E-1/X.25 includes the complete diagnostic field listing.

Table A-1 : Annex E International Problem Diagnostic Code Differences

Decimal Value Annex E, Rec. X.25 Diagnostic Description Cisco Proprietary Definition of Diagnostic Codes
112 International problem Not used.
113 Remote network problem Not used.
114 International protocol problem Not used.
115 International link out of order Indicates one of the following failures: failed when initializing a switched PVC; in TCP tunneling, failed when initiating or resetting a PVC; or, failed when PAD PVC circuit was initiated or reset.
116 International link busy Not used.
117 Transit network facility problem Not used.
118 Remote network facility problem Not used.
119 International routing problem Indicates the following failure: in TCP tunneling of X.25 when session is closed by network. In addition to its standard meaning, Cisco routers use this code to signal an abnormal X.25-over-TCP (XOT) condition. This code is used when an X.25 Virtual Circuit connection is intiated using XOT, but but the remote XOT peer closed the TCP connection. This commonly occurs when the remote XOT peer could not route the received call.
120 Temporary routing problem Indicates the following failure: when tunneling X.25 through TCP/IP and the remote network is identified as unreachable.
In addition to its standard meaning, Cisco routers use this code to signal an abnormal X.25-over-TCP (XOT) condition. This code is used when an X.25 Virtual Circuit connection cannot be intiated using XOT because the TCP connection fails due to an unreachable remote XOT peer.
121 Unknown called DNIC Not used.
122 Maintenance action (may apply to maintenance action within a national network For CMNS, indicates the following: router fails to route the call due to setup or unreachability of destination; when VC is cleared using the clear x25-vc EXEC command; when router CLEARs a VC when its idle timer expires.


X.25 Cause Codes

A cause code indicates an event that triggered an X.25 packet. The cause code can only appear in entries for CLEAR REQUEST, REGISTRATION CONFIRMATION, RESET REQUEST, and RESTART packets. Possible values for the cause code can vary, depending on the type of packet. Because the REGISTRATION exchange is not supported, those cause codes are not documented in this section.

Table A-2 describes the meanings of cause codes for CLEAR REQUEST packets.

Table A-2 : Cause Code Descriptions for CLEAR REQUEST Packets

Code
(Hex) 		Code
(Dec)
Description
00 0 (or 128 to 255) DTE originated
01 1 Number busy
03 3 Invalid facility request
05 5 Network congestion
09 9 Out of order
0B 11 Access barred
0D 13 Not obtainable
11 17 Remote procedure error
13 19 Local procedure error
15 21 RPOA out of order
19 25 Reverse charging not accepted
21 33 Incompatible destination
29 41 Fast select not accepted
39 57 Ship absent

Table A-3 describes the meanings of cause codes for RESET REQUEST packets.

Table A-3 : Cause Code Descriptions for RESET REQUEST Packets

Code
(Hex) 		Code
(Dec)
Description
00 0 (or 128 to 255) DTE originated
01 1 Out of order
03 3 Remote procedure error
05 5 Local procedure error
07 7 Network congestion
09 9 Remote DTE operational
0F 15 Network operational
11 17 Incompatible destination
1D 29 Network out of order

Table A-4 describes the meanings of cause codes for RESTART packets.

Table A-4 : Cause Code Descriptions for RESTART Packets

Code
(Hex) 		Code
(Dec)
Description
00 0 (or 128 to 255) DTE restarting
01 1 Local procedure error
03 3 Network congestion
07 7 Network operational
7F 127 Registration/cancellation confirmed


X.25 Diagnostic Codes

The X.25 diag (diagnostic) code provides an additional hint as to what, if anything, went wrong. This code can only appear in entries for CLEAR REQUEST, DIAGNOSTIC, RESET REQUEST, and RESTART packets. Unlike the cause codes, the diag codes do not vary depending upon the type of packet.

Note These diagnostic codes can be produced by any equipment handling a given virtual circuit, and are then propagated through all equipment handling that virtual circuit. Thus, receipt of a diagnostic code may not indicate a problem with the router.

Table A-5 describes the meanings of possible diag codes.

Table A-5 : X.25 Diagnostic Field Code Descriptions

Code
(Hex) 		Code
(Dec)
Description
00 00 No additional information
01 01 Invalid P(S)
02 02 Invalid P(R)
10 16 Packet type invalid
11 17 Packet type invalid for state R1
12 18 Packet type invalid for state R2
13 19 Packet type invalid for state R3
14 20 Packet type invalid for state P1
15 21 Packet type invalid for state P2
16 22 Packet type invalid for state P3
17 23 Packet type invalid for state P4
18 24 Packet type invalid for state P5
19 25 Packet type invalid for state P6
1A 26 Packet type invalid for state P7
1B 27 Packet type invalid for state D1
1C 28 Packet type invalid for state D2
1D 29 Packet type invalid for state D3
20 32 Packet not allowed
21 33 Unidentifiable packet
22 34 Call on one-way logical channel
23 35 Invalid packet type on a permanent virtual circuit
24 36 Packet on unassigned LCN
25 37 Reject not subscribed to
26 38 Packet too short
27 39 Packet too long
28 40 Invalid GFI (General Format Identifier)
29 41 Restart or registration packet with nonzero LCI
2A 42 Packet type not compatible with facility
2B 43 Unauthorized interrupt confirmation
2C 44 Unauthorized interrupt
2D 45 Unauthorized reject
30 48 Timer expired
31 49 Timer expired for incoming call
32 50 Timer expired for clear indication
33 51 Timer expired for reset indication
34 52 Timer expired for restart indication
35 53 Timer expired for call deflection
40 64 Call setup, clearing, or registration problem
41 65 Facility code not allowed
42 66 Facility parameter not allowed
43 67 Invalid called address
44 68 Invalid calling address
45 69 Invalid facility length
46 70 Incoming call barred
47 71 No logical channel available
48 72 Call collision
49 73 Duplicate facility requested
4A 74 Nonzero address length
4B 75 Nonzero facility length
4C 76 Facility not provided when expected
4D 77 Invalid ITU-T-specified DTE facility
4E 78 Maximum number of call redirections or deflections exceeded
50 80 Miscellaneous
51 81 Improper cause code for DTE
52 82 Octet not aligned
53 83 Inconsistent Q bit setting
54 84 NUI (Network User Identification) problem
70 112 International problem
71 113 Remote network problem
72 114 International protocol problem
73 115 International link out of order
74 116 International link busy
75 117 Transit network facility problem
76 118 Remote network facility problem
77 119 International routing problem
78 120 Temporary routing problem
79 121 Unknown called DNIC
7A 122 Maintenance action (clear x25 vc command issued)

Diagnostic codes with values of 80 or greater in hexadecimal, or with values of 128 or greater in decimal, are specific to a particular network. To learn the meanings of these codes, contact the administrator for that network.