| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 518.1 | Possible a LAPB link is non-existent or not enabled | OZROCK::HARTWIG | Arthur Hartwig, TaN Engineering-Australia | Sat May 17 1997 00:35 | 26 |
| The modem connect line does NOT have DTR asserted; it probably doesn't have an
active client. The cable has been detected a number of times; perhaps the modem
connect line has been enabled/disabled a few times; perhaps other entities have
been disabled also.
Work methodically up the stack:
1) Have you got a LAPB link using the particular modem connect line?
Is the LAPB link enabled?
2) Does the LAPB link have a X25 PROTOCOL DTE using it? Is the X25 PROTOCOL DTE
enabled?
If you answered NO to any of the above questions then your observation is
explained.
You can use the NCL commands 'show modem connect data port * all' and 'show lapb
port * all' to check associations between the named entity and its user (if
there is a user).
There is a trouble shooting guide for X.25; have you used it?
Are there any other events written to the operator log. In particular, the DNSES
is a firmware device; are there messages about the firmware loading or dumping?
(There should be a firmware load for each DNSES as the system starts; but no
more.)
|
| 518.2 | More Information | MROA::KAMINSKY | CCS - Electronic Commerce | Sat May 17 1997 02:11 | 398 |
| > <<< Note 518.1 by OZROCK::HARTWIG "Arthur Hartwig, TaN Engineering-Australia" >>>
> -< Possible a LAPB link is non-existent or not enabled >-
>
>The modem connect line does NOT have DTR asserted; it probably doesn't have an
>active client. The cable has been detected a number of times; perhaps the modem
>connect line has been enabled/disabled a few times; perhaps other entities have
>been disabled also.
>Work methodically up the stack:
>1) Have you got a LAPB link using the particular modem connect line?
>Is the LAPB link enabled?
Yes, state is on - initializing
>2) Does the LAPB link have a X25 PROTOCOL DTE using it? Is the X25 PROTOCOL DTE
>enabled?
Yes, state is unsynchronised
>If you answered NO to any of the above questions then your observation is
>explained.
>You can use the NCL commands 'show modem connect data port * all' and 'show lapb
>port * all' to check associations between the named entity and its user (if
>there is a user).
Below is the output of the commands you listed above and "show lapb link * all"
and "show x25 prot dte * all". Sorry for the lengthy note, but I hope this may
provide a clue to the problem.
>There is a trouble shooting guide for X.25; have you used it?
Is there an on-line pointer to this document? I get involved with setting up
X.25 once every 12-15 months and after it is setup it just runs, so I am kind
of rusty in this area...
>Are there any other events written to the operator log. In particular, the DNSES
>is a firmware device; are there messages about the firmware loading or dumping?
>(There should be a firmware load for each DNSES as the system starts; but no
>more.)
No, I don't see any other errors reported.
Regards,
Frank
-----------------------------------------
mc ncl show modem connect data port * all
-----------------------------------------
Node 0 Modem Connect Data Port DNSES-01
at 1997-05-16-10:52:03.078-04:00I0.726
Identifiers
Name = DNSES-01
Status
Client = LAPB Link GEIS02
Line = DNSES-1-0
State = Open
Node 0 Modem Connect Data Port DNSES-00
at 1997-05-16-10:52:03.078-04:00I0.726
Identifiers
Name = DNSES-00
Status
Client = LAPB Link GEIS01
Line = DNSES-0-0
State = Open
---------------------------
mc ncl show lapb port * all
---------------------------
Node 0 LAPB Port LAPB-port-001
at 1997-05-16-10:54:03.198-04:00I0.695
Identifiers
Name = LAPB-port-001
Status
Client = X25 Protocol DTE GEIS02
Link = LAPB Link GEIS02
Type = Sequenced
State = Open
Node 0 LAPB Port LAPB-port-000
at 1997-05-16-10:54:03.199-04:00I0.695
Identifiers
Name = LAPB-port-000
Status
Client = X25 Protocol DTE GEIS01
Link = LAPB Link GEIS01
Type = Sequenced
State = Open
---------------------------
mc ncl show lapb link * all
---------------------------
Node 0 LAPB Link GEIS02
at 1997-05-16-10:55:55.140-04:00I0.706
Identifiers
Name = GEIS02
Status
State = On
Protocol State = Initialising
Physical Port = Modem Connect Data Port DNSES-01
Maximum PDU size = 1029
Line Type = Nonswitched
UID = 190E296E-8A9C-1254-8010-AA000400C647
Characteristics
Profile = "MARKNET"
Acknowledge Timer = 3000
Sequence Modulus = 128
Holdback Timer = 10
Maximum Data Size = 1026
Window Size = 7
Interface Type = DTE
Retry Maximum = 10
Physical Line = Modem Connect Line DNSES-1-0
Poll Timer = 60
Counters
Creation Time = 2114-11-16-23:01:55.944-05:00Iinf
Times Link State Changed = 1
CRC Errors Received = 7
Data Octets Received = 0
Data Octets Sent = 0
Data PDUs Received = 0
Data PDUs Sent = 0
FRMRs Received = 0
FRMRs Sent = 0
Times Acknowledge Timer Expired = 29502
Times PDU Transmit Failed = 21260
Times PDU Receive Overrun = 0
REJs Received = 0
REJs Sent = 0
Polls Received = 0
RNRs Received = 0
RNRs Sent = 0
Times Link Halted = 0
Times Link Resetting = 0
Times Link Initialising = 1
Times Link Running = 0
Times Link Inoperative = 0
Times Link Maintenance = 0
Times Link Setup Failed = 0
Node 0 LAPB Link GEIS01
at 1997-05-16-10:55:55.140-04:00I0.706
Identifiers
Name = GEIS01
Status
State = On
Protocol State = Initialising
Physical Port = Modem Connect Data Port DNSES-00
Maximum PDU size = 1029
Line Type = Nonswitched
UID = 17BD1E80-8A9C-1254-8010-AA000400C647
Characteristics
Profile = "MARKNET"
Acknowledge Timer = 3000
Sequence Modulus = 128
Holdback Timer = 10
Maximum Data Size = 1026
Window Size = 7
Interface Type = DTE
Retry Maximum = 10
Physical Line = Modem Connect Line DNSES-0-0
Poll Timer = 60
Counters
Creation Time = 2114-11-16-23:01:53.735-05:00Iinf
Times Link State Changed = 1
CRC Errors Received = 0
Data Octets Received = 0
Data Octets Sent = 0
Data PDUs Received = 0
Data PDUs Sent = 0
FRMRs Received = 0
FRMRs Sent = 0
Times Acknowledge Timer Expired = 29502
Times PDU Transmit Failed = 21079
Times PDU Receive Overrun = 0
REJs Received = 0
REJs Sent = 0
Polls Received = 0
RNRs Received = 0
RNRs Sent = 0
Times Link Halted = 0
Times Link Resetting = 0
Times Link Initialising = 1
Times Link Running = 0
Times Link Inoperative = 0
Times Link Maintenance = 0
Times Link Setup Failed = 0
------------------------------
mc ncl show x25 prot dte * all
------------------------------
Node 0 X25 Protocol DTE GEIS02
at 1997-05-16-10:57:07.373-04:00I0.713
Identifiers
Name = GEIS02
Status
UID = 1957C4D4-8A9C-1254-8010-AA000400C647
State = Unsynchronised
Available Outgoing Channels = 4095
DTE Classes =
{
MARKNET ,
GEIS02
}
Groups =
{
}
Last State Change = 2114-11-16-23:01:58.965-05:00Iinf
Interface Mode = DTE
Characteristics
Inbound DTE Class = MARKNET
Profile = "MARKNET"
X25 Address = 31360917874302
Interface Type = DTE
Maximum Active Circuits = 4096
Maximum Clear Attempts = 2
Maximum Reset Attempts = 2
Maximum Restart Attempts = 2
Call Timer = 180
Clear Timer = 180
Interrupt Timer = 180
Reset Timer = 180
Restart Timer = 180
Link Service Provider = LAPB Link GEIS02
Outgoing List =
{
[1..4095]
}
Extended Packet Sequencing = False
Maximum Throughput Class = 48000
Minimum Throughput Class = 75
Maximum Packet Size = 128
Default Packet Size = 128
Minimum Packet Size = 16
Maximum Window Size = 2
Default Window Size = 2
Minimum Window Size = 1
CCITT Version = 1984
Incoming List =
{
[1..4095]
}
Segment Size = 64
Description = "DEC X.25 V1.0 for OpenVMS AXP Systems"
Counters
Creation Time = 2114-11-16-23:01:56.426-05:00Iinf
Data Octets Received = 0
Data Octets Sent = 0
Data PDUs Received = 0
Data PDUs Sent = 0
Incoming Calls Connected = 0
Outgoing Calls Connected = 0
Calls Failed = 0
Fast Selects Received = 0
Fast Selects Sent = 0
Locally Initiated Resets = 0
Network Initiated Resets = 0
Locally Initiated Restarts = 0
Network Initiated Restarts = 0
Allocated PVC Failures = 0
Protocol Errors = 0
Diagnostic Packets = 0
Illegal Packets = 0
Reject Packets = 0
Retry Failures = 0
Up Transitions = 0
Down Transitions = 0
Node 0 X25 Protocol DTE GEIS01
at 1997-05-16-10:57:07.373-04:00I0.713
Identifiers
Name = GEIS01
Status
UID = 18281A46-8A9C-1254-8010-AA000400C647
State = Unsynchronised
Available Outgoing Channels = 4095
DTE Classes =
{
GEIS01 ,
MARKNET
}
Groups =
{
}
Last State Change = 2114-11-16-23:01:58.688-05:00Iinf
Interface Mode = DTE
Characteristics
Inbound DTE Class = MARKNET
Profile = "MARKNET"
X25 Address = 31360907874301
Interface Type = DTE
Maximum Active Circuits = 4096
Maximum Clear Attempts = 2
Maximum Reset Attempts = 2
Maximum Restart Attempts = 2
Call Timer = 180
Clear Timer = 180
Interrupt Timer = 180
Reset Timer = 180
Restart Timer = 180
Link Service Provider = LAPB Link GEIS01
Outgoing List =
{
[1..4095]
}
Extended Packet Sequencing = False
Maximum Throughput Class = 48000
Minimum Throughput Class = 75
Maximum Packet Size = 128
Default Packet Size = 128
Minimum Packet Size = 16
Maximum Window Size = 2
Default Window Size = 2
Minimum Window Size = 1
CCITT Version = 1984
Incoming List =
{
[1..4095]
}
Segment Size = 64
Description = "DEC X.25 V1.0 for OpenVMS AXP Systems"
Counters
Creation Time = 2114-11-16-23:01:54.436-05:00Iinf
Data Octets Received = 0
Data Octets Sent = 0
Data PDUs Received = 0
Data PDUs Sent = 0
Incoming Calls Connected = 0
Outgoing Calls Connected = 0
Calls Failed = 0
Fast Selects Received = 0
Fast Selects Sent = 0
Locally Initiated Resets = 0
Network Initiated Resets = 0
Locally Initiated Restarts = 0
Network Initiated Restarts = 0
Allocated PVC Failures = 0
Protocol Errors = 0
Diagnostic Packets = 0
Illegal Packets = 0
Reject Packets = 0
Retry Failures = 0
Up Transitions = 0
Down Transitions = 0
|
| 518.3 | | OZROCK::HARTWIG | Arthur Hartwig, TaN Engineering-Australia | Sat May 24 1997 02:37 | 33 |
| The X.25 trouble shooting guide is part of the doc kit on the
consolidated docs CD-ROM.
It looks as if you have all the necessary entities enabled. I should
have asked for a display of all the modem connect line attributes at
the same time.
You should have DTR asserted on the modem connect line and the modem
should recognise that DTR is asserted. (If the latter is not true you
probabl have a cable problem.) I also observed that one of your LAPB
links had seen 7 CRC errors. This number shouldn't change very much.
But if 7 CRC errors have been seen that means some incoming frames have
been observed - the modem has presented you something, even if not very
useful.
I suggest you also record a modem connect line trace - it appears there
is at least some instance of the modem presenting you something and
that suggests that at some stage the modem did see DTR from your
system.
Are you sure the LAPB sequence modulus should be 128? (Its a little
uncommmon and not particularly useful with a window size of 7.) If
there is a LAPB sequence modulus mismatch then LAPB won't start. If
someone then panics and starts pulling cables apart, changines entity
states and looking at entity attributes in an unstructured way then the
returned values won't necessarily be helpful.
I suggest you start at the bottom layer and work up; The modem connect
line should have DTR asserted and RTS asserted. If not, make sure the
cable is connected to the modem, the modem is powered on.
If DTR is not asserted check the LAPB link using this line is
enabled and initialising; if not check the x25 protocol DTE is enabled.
|
| 518.4 | resolved | HTKING::M_SHELDON | | Tue Jun 03 1997 06:59 | 15 |
| Thanks for the help Arthur. This problem has been resolved.
1) The sequence modulus was changed from 128 to 8.
2) The X.25 provider changed his DSU's to enable the V.35 interface
instead of the RS232 interface.
DTR really was being asserted at particular times... the ncl snapshot
he captured in an earlier workunit happened to be when both modem
connect lines had DTR "not asserted".
Mike Sheldon
CSC/CS Network Support
|