Cisco - Router as Terminal Server 2600 & 2900 - Issue with Console Lin

Yasmeen · ‎02-17-2022

Hi Team,

In our Lab we have 2900 series routers and we are using it as a Terminal Server. It has lines from 33 to 64

we have four terminal server - suddenly all terminal server connected console lines working very very slowly and not able to type anything after clear line too

Tty Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int
0 CTY - - - - - 0 0 0/0 -
33 TTY 115200/115200- - - - - 0 0 0/0 -
34 TTY 9600/9600 - - - - - 0 0 0/0 -
35 TTY 9600/9600 - - - - - 0 0 0/0 -
36 TTY 9600/9600 - - - - - 0 0 0/0 -
37 TTY 9600/9600 - - - - - 0 0 0/0 -
38 TTY 9600/9600 - - - - - 1 4566 0/0 -
39 TTY 9600/9600 - - - - - 0 0 0/0 -
40 TTY 9600/9600 - - - - - 0 8858 0/0 -
41 TTY 9600/9600 - - - - - 0 0 0/0 -
42 TTY 9600/9600 - - - - - 0 0 0/0 -
43 TTY 9600/9600 - - - - - 0 12146 0/0 -
44 TTY 9600/9600 - - - - - 0 4369 0/0 -
45 TTY 9600/9600 - - - - - 0 0 0/0 -
46 TTY 9600/9600 - - - - - 0 0 0/0 -
47 TTY 9600/9600 - - - - - 0 0 0/0 -
48 TTY 9600/9600 - - - - - 2 214 0/0 -
49 TTY 9600/9600 - - - - - 0 0 0/0 -
50 TTY 9600/9600 - - - - - 0 12794 0/0 -
51 TTY 115200/115200- - - - - 6 2 0/0 -
52 TTY 9600/9600 - - - - - 0 0 0/0 -
53 TTY 9600/9600 - - - - - 2 55032 1/0 -
54 TTY 9600/9600 - - - - - 0 21257 0/0 -
55 TTY 9600/9600 - - - - - 0 0 0/0 -
56 TTY 9600/9600 - - - - - 0 0 0/0 -
57 TTY 9600/9600 - - - - - 0 0 0/0 -
58 TTY 9600/9600 - - - - - 0 4067 0/0 -
59 TTY 9600/9600 - - - - - 0 0 0/0 -
60 TTY 9600/9600 - - - - - 0 24 0/0 -
61 TTY 9600/9600 - - - - - 0 1289 0/0 -
62 TTY 9600/9600 - - - - - 8 135 0/0 -
63 TTY 9600/9600 - - - - - 0 0 0/0 -
64 TTY 9600/9600 - - - - - 0 0 0/0

lab#show version
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-I-M), Version 12.3(12e), RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2005 by cisco Systems, Inc.
Compiled Wed 24-Aug-05 07:50 by ssearch
Image text-base: 0x80008098, data-base: 0x80CCAEF0

ROM: System Bootstrap, Version 12.2(8r) [cmong 8r], RELEASE SOFTWARE (fc1)
ROM: C2600 Software (C2600-I-M), Version 12.3(12e), RELEASE SOFTWARE (fc2)

May i know reason for Terminal Server connected all console lines slowness and not opened issue.

It happened with all the Four Terminal Server at same time.

Also i am not able see the syslogs

in Show Logging

could you please help to configure and find the issue

lab#show logging
Syslog logging: enabled (0 messages dropped, 1 messages rate-limited, 0 flushes, 0 overruns, xml disabled)
Console logging: level notifications, 7 messages logged, xml disabled
Monitor logging: level debugging, 0 messages logged, xml disabled
Buffer logging: disabled, xml disabled
Logging Exception size (4096 bytes)
Count and timestamp logging messages: enabled
Trap logging: level informational, 12 message lines logged

Georg Pauwen · ‎02-17-2022

Hello,

what is the output of:

show tcp tcb

?

Yasmeen · ‎02-18-2022

lab#show tcp

tty51, virtual tty from host 64.104.151.139
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Local host: 10.77.1.25, Local port: 2051
Foreign host: 64.104.151.139, Foreign port: 36284

Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)

Event Timers (current time is 0x336797B):
Timer Starts Wakeups Next
Retrans 1341 0 0x0
TimeWait 0 0 0x0
AckHold 114 50 0x0
SendWnd 0 0 0x0
KeepAlive 0 0 0x0
GiveUp 0 0 0x0
PmtuAger 0 0 0x0
DeadWait 0 0 0x0

iss: 1162384642 snduna: 1162749826 sndnxt: 1162749826 sndwnd: 65535
irs: 3657998884 rcvnxt: 3657999102 rcvwnd: 3911 delrcvwnd: 217

SRTT: 300 ms, RTTO: 303 ms, RTV: 3 ms, KRTT: 0 ms
minRTT: 12 ms, maxRTT: 300 ms, ACK hold: 200 ms
Flags: passive open, higher precedence, retransmission timeout

Datagrams (max data segment is 536 bytes):
Rcvd: 1455 (out of order: 0), with data: 114, total data bytes: 217
Sent: 1399 (retransmit: 0, fastretransmit: 0), with data: 1348, total data bytes: 365183

tty53, virtual tty from host 10.30.221.68
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Local host: 10.77.1.25, Local port: 2053
Foreign host: 10.30.221.68, Foreign port: 54918

Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)

Event Timers (current time is 0x3369CBA):
Timer Starts Wakeups Next
Retrans 5068 2 0x0
TimeWait 0 0 0x0
AckHold 501 81 0x0
SendWnd 0 0 0x0
KeepAlive 0 0 0x0
GiveUp 0 0 0x0
PmtuAger 0 0 0x0
DeadWait 0 0 0x0

iss: 3214163149 snduna: 3214499461 sndnxt: 3214499461 sndwnd: 65392
irs: 1954706627 rcvnxt: 1954709060 rcvwnd: 3897 delrcvwnd: 231

SRTT: 300 ms, RTTO: 303 ms, RTV: 3 ms, KRTT: 0 ms
minRTT: 212 ms, maxRTT: 357 ms, ACK hold: 200 ms
Flags: passive open, higher precedence, retransmission timeout

Datagrams (max data segment is 536 bytes):
Rcvd: 5277 (out of order: 0), with data: 501, total data bytes: 2432
Sent: 5234 (retransmit: 2, fastretransmit: 0), with data: 5148, total data bytes: 336311

tty66, virtual tty from host 10.77.1.5
Connection state is ESTAB, I/O status: 1, unread input bytes: 4
Local host: 10.77.1.25, Local port: 23
Foreign host: 10.77.1.5, Foreign port: 48798

Enqueued packets for retransmit: 0, input: 4 mis-ordered: 0 (0 bytes)

Event Timers (current time is 0x336DC64):
Timer Starts Wakeups Next
Retrans 70 0 0x0
TimeWait 0 0 0x0
AckHold 61 21 0x0
SendWnd 0 0 0x0
KeepAlive 0 0 0x0
GiveUp 0 0 0x0
PmtuAger 0 0 0x0
DeadWait 0 0 0x0

iss: 364580240 snduna: 364583668 sndnxt: 364584228 sndwnd: 35840
irs: 2603683738 rcvnxt: 2603683868 rcvwnd: 3999 delrcvwnd: 125

SRTT: 300 ms, RTTO: 303 ms, RTV: 3 ms, KRTT: 0 ms
minRTT: 0 ms, maxRTT: 300 ms, ACK hold: 200 ms
Flags: passive open, higher precedence, retransmission timeout

Datagrams (max data segment is 1460 bytes):
Rcvd: 131 (out of order: 0), with data: 61, total data bytes: 129
Sent: 97 (retransmit: 0, fastretransmit: 0), with data: 75, total data bytes: 4547

Georg Pauwen · ‎02-18-2022

Hello,

can you post the output of:

show tcp tcb

balaji.bandi · ‎02-18-2022

how is your CPU, sh process cpu sorted | ex 0.00, since it is manangment, when you get chance reboot and test it.

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MHM Cisco World · ‎02-18-2022

can we see the config of line and/Or modem? I think this relate to Physical Layer config.

Yasmeen · ‎02-20-2022

Hi MHM

Could you please send me the show commands for configs check
which configs want share ?

MHM Cisco World · ‎02-23-2022

noise is so high, do you have good new cable connect it and monitor noise for this new cable, if the problem solve change the cable for all port.