Re: Cisco - Router as Terminal Server 2600 & 2900 - Issue with Con

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.

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