WS-C3750G-24TS-S console output incomplete VS SSH output complete

[Gigi]

Hi everyone,

when I connect to the switch by line con 0 (console serial port) and I write the command "show run" or "show interfaces summary" or "show version" or "show ip interface brief"

the output is incomplete.

If I type the same commands via SSH connection, the output for each command is more complete than via line con 0.

e.g.

VIA CONSOLE:

Switch3750G-Gigi#sh run
Building configuration...

Current configuration : 3566 bytes
!
version 12.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Switch3750G-Gigi
!
boot-start-marker
boot-end-marker
!
!
username Gigi privilege 15 secret 5 ******************************
no aaa new-model
switch 1 provision ws-c3750g-24ts
system mtu routing 1500
ip subnet-zero
no ip domain-lookup
!
!

(NO INTERFACES ARE LISTED)

Switch3750G-Gigi#

Switch3750G-Gigi#sh ver
Cisco IOS Software, C3750 Software (C3750-IPSERVICESK9-M), Version 12.2(44)SE3, RELEASE SOFTWARE (fc2)
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Mon 29-Sep-08 00:46 by nachen
Image text-base: 0x00003000, data-base: 0x017C0000

ROM: Bootstrap program is C3750 boot loader
BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(25r)SEE3, RELEASE SOFTWARE (fc1)

Switch3750G-Gigi uptime is 1 day, 56 minutes
System returned to ROM by power-on
System image file is "flash:c3750-ipservicesk9-mz.122-44.SE3/c3750-ipservicesk9-mz.122-44.SE3.bin"

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable

(NO SERIAL NUMBERS ARE LISTED, NO IMAGE VERSION IS DISPLAYED)         

Switch3750G-Gigi#sh interfaces summary

 *: interface is up
 IHQ: pkts in input hold queue     IQD: pkts dropped from input queue
 OHQ: pkts in output hold queue    OQD: pkts dropped from output queue
 RXBS: rx rate (bits/sec)          RXPS: rx rate (pkts/sec)
 TXBS: tx rate (bits/sec)          TXPS: tx rate (pkts/sec)
 TRTL: throttle count

  Interface               IHQ   IQD  OHQ   OQD  RXBS RXPS  TXBS TXPS TRTL
-------------------------------------------------------------------------
* Vlan1                    0     0    0     0  2000    1     0    0    0
  GigabitEthernet1/0/1     0     0    0     0     0    0     0    0    0
  GigabitEthernet1/0/2     0     0    0     0     0    0     0    0    0
  GigabitEthernet1/0/3     0     0    0     0     0    0     0    0    0
  GigabitEthernet1/0/4     0     0    0     0     0    0     0    0    0
  GigabitEthernet1/0/5     0     0    0     0     0    0     0    0    0
  GigabitEthernet1/0/6     0     0    0     0     0    0     0    0    0
  GigabitEthernet1/0/7     0     0    0     0     0    0     0    0    0
  GigabitEthernet1/0/8     0     0    0     0     0    0     0    0    0
  GigabitEthernet1/0/9     0     0    0     0     0    0     0    0    0
  GigabitEthernet1/0/10    0     0    0     0     0    0     0    0    0
  GigabitEthernet1/0/11    0     0    0     0     0    0     0    0    0
  GigabitEthernet1/0/12    0     0    0     0     0    0     0    0    0
(ONLY 12 OF 28 PORTS ARE LISTED)     

    
Switch3750G-Gigi#show ip interface brief
Interface              IP-Address      OK? Method Status                Protocol
Vlan1                  xyz.xyz.xyz.xyz YES NVRAM  up                    up     
GigabitEthernet1/0/1   unassigned      YES unset  down                  down   
GigabitEthernet1/0/2   unassigned      YES unset  down                  down   
GigabitEthernet1/0/3   unassigned      YES unset  down                  down   
GigabitEthernet1/0/4   unassigned      YES unset  down                  down   
GigabitEthernet1/0/5   unassigned      YES unset  down                  down   
GigabitEthernet1/0/6   unassigned      YES unset  down                  down   
GigabitEthernet1/0/7   unassigned      YES unset  down                  down   
GigabitEthernet1/0/8   unassigned      YES unset  down                  down   
GigabitEthernet1/0/9   unassigned      YES unset  down                  down   
GigabitEthernet1/0/10  unassigned      YES unset  down                  down   
GigabitEthernet1/0/11  unassigned      YES unset  down                  down   
GigabitEthernet1/0/12  unassigned      YES unset  down                  down   
GigabitEthernet1/0/13  unassigned      YES unset  down                  down   
GigabitEthernet1/0/14  unassigned      YES unset  down                  down   
GigabitEthernet1/0/15  unassigned      YES unset  down                  down   
GigabitEthernet1/0/16  unassigned      YES unset  down                  down   
GigabitEthernet1/0/17  unassigned      YES unset  down                  down   
GigabitEthernet1/0/18  unassigned      YES unset  down                  down   
GigabitEthernet1/0/19  unassigned      YES unset  down                  down   
GigabitEthernet1/0/20  unassigned      YES unset  down                  down   
GigabitEthernet1/0/21  unassigned      YES unset  down                  down   
(ONLY 21 OF 28 PORTS ARE LISTED)         
Switch3750G-Gigi#

If I write the same command while connected via SSH (line vty) the output is more complete than the previous one:

Switch3750G-Gigi#sh run
Building configuration...

Current configuration : 3566 bytes
!
version 12.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Switch3750G-Gigi
!
boot-start-marker
boot-end-marker
!
!
username Gigi privilege 15 secret 5 ******************************
no aaa new-model
switch 1 provision ws-c3750g-24ts
system mtu routing 1500
ip subnet-zero
no ip domain-lookup
!
!
!
crypto pki trustpoint TP-self-signed-1495123278
 enrollment selfsigned
 subject-name cn=IOS-Self-Signed-Certificate-1495123278
 revocation-check none
 rsakeypair TP-self-signed-1495123278
!
!
crypto pki certificate chain TP-self-signed-1495123278
 certificate self-signed 01
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249  
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249
  30820249 30820249 30820249 30820249 30820249 30820249 30820249 30820249
  30820249 30820249 30820249 AB
  quit
!
!
!
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
!
!
!
interface GigabitEthernet1/0/1
!
interface GigabitEthernet1/0/2
!
interface GigabitEthernet1/0/3
!
interface GigabitEthernet1/0/4
!
interface GigabitEthernet1/0/5
!
interface GigabitEthernet1/0/6
!
interface GigabitEthernet1/0/7
!
interface GigabitEthernet1/0/8
!
interface GigabitEthernet1/0/9
!
interface GigabitEthernet1/0/10
!
interface GigabitEthernet1/0/11
!
interface GigabitEthernet1/0/12
!
interface GigabitEthernet1/0/13
!
interface GigabitEthernet1/0/14
!
interface GigabitEthernet1/0/15
!
interface GigabitEthernet1/0/16
!
interface GigabitEthernet1/0/17
!
interface GigabitEthernet1/0/18
!
interface GigabitEthernet1/0/19
!
interface GigabitEthernet1/0/20
!
interface GigabitEthernet1/0/21
!
interface GigabitEthernet1/0/22
!
interface GigabitEthernet1/0/23
 !
interface GigabitEthernet1/0/24
 !
interface GigabitEthernet1/0/25
!
interface GigabitEthernet1/0/26
!        
interface GigabitEthernet1/0/27
!
interface GigabitEthernet1/0/28
!
interface Vlan1
ip address xyz.xyz.xyz.xyz xyy.xyy.xyy.xyz
!
ip default-gateway xyz.xyz.xyz.xyz
ip classless
ip http server
ip http secure-server
!
!
!
control-plane
!
!
line con 0
 login local
line vty 0 4
 login local
line vty 5 15
 login local
!
end

Switch3750G-Gigi#

It seems to me a little bit abnormal, tell me if there is a solution, please.

Thank you for your help.

Gigi

[Reza Sharifi]

Hi,

What application are you using?

Try using a different terminal emulator like putty or SecureCrt and test again.

HTH

[Gigi · Accepted solution]

Hi Reza,

Thank you for the quick reply.

I'm using Secure CRT Version 7.2.4 (x64 build 524) on Windows 7 Pro x64.

Following your suggestion I've tried PuTTy Release 0.64 (on Windows 7 Pro x64) and it works fine.

So I've checked the PuTTy settings of the serial and they were: Speed Baud: 9600, Data bits: 8, Stop bits: 1; Parity: None; Flow Control: XON/XOFF.

The same settings I was using on Secure CRT exept for the "Flow Control: XON/XOFF".

Once added the flag on the Secure CRT XON/XOFF checkbox, now It works perfectly even on Secure CRT, and the output is as usual, with all the information about all ports in the same screens.

Sorry if I didn't thought about it before, after almost 20 years of telnetting and SSH via console I never noticed such kind a behaviour. Strange also because the same serial settings (without XONN/XOFF flag) have worked fine with WS-C2960-24TC-L, WS-C2950T-24, WS-C2960-48TC-L and so on. Hoping to have provided helpful tips, thanks to your suggetions, I thank you for your support. Gigi - Sardinia - Italy

[Joseph W. Doherty]

Possibly an IOS bug. Would suggest you try a recommended stable code version (e.g. 55SE11).

[Gigi]

Thank You Joseph, I've solved changing the serial setting on Secure CRT. Anyway, I'll follow your suggestion installing the stable release you've recommended. Thank you. Gigi

[Joseph W. Doherty]

Glad to hear you've found a solution, but still, very strange.

If you do upgrade the IOS, it would be interesting to know whether it exhibits the same console interactions or not.