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.

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.
120	Temporary routing problem	Indicates the following failure: when tunneling X.25 through TCP/IP and the remote network is identified as unreachable.
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.

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.

120

Temporary routing problem

Indicates the following failure: when tunneling X.25 through TCP/IP and the remote network is identified as unreachable.

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.

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-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.

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-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.

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

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.

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)

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.

Table of Contents

X.25 Cause and Diagnostic Codes

X.25 Cause Codes

X.25 Diagnostic Codes