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Question about the command : logging synchronous

hi folks,

i have a question about this command logging synchronous.

we have 3750-emi and use on this large access-lists.

Now we have the problem when we copy this access-lists over the telnetconnection (vty) to the maschine then the first lines are very fast then stops 3sec and more and then you see the next lines pasted but the time between the pasted lines increase and than i can see that our management station shows the 3750 as lost.it takes 3-5min then he lost the connection for the telnet session.i have ask our local dealer here and he told me this problem occurs with the command logging synchronous.

now my question : for what will this command used? i cann't find information on the cisco side (command lookup tolds me nothing).

thank you very much for your help

here are the config for the vty-lines

line con 0

exec-timeout 15 0

logging synchronous

stopbits 1

flowcontrol software

line vty 0 4

session-timeout 300

exec-timeout 5 0

logging synchronous

history size 256

stopbits 1

line vty 5 15

5 REPLIES

Re: Question about the command : logging synchronous

Hi Friend,

Logging synchronous command is useful whenever console messages are being displayed at the same time that you are trying to input EXEC or configuration commands. Instead of console messages being intermingled with your input, your input is redisplayed on a single line at the finish of each console message that "interrupts" your input.

This makes reading your input much easier.

Now as you are saying that you loose the telnet connection it may be because of the reason you are implementing some ACLS which may restrict your telnet connection.

HTH, if yes please rate the post.

Ankur

New Member

Re: Question about the command : logging synchronous

Hello Ankur,

thanks for your fast replay.

the acls are for interfaces that points to customer interfaces.it looks like a watchdog problem.i have tested it now with the tftp command and the consoleport directly and it works.only when i make a telnet connection from our managementstation and copy and past the access-list i have this problem.

but your explanation is very good

thanks

Klaus

Re: Question about the command : logging synchronous

hi,

may this link will help u

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/1219ea1/scg/swlog.htm#32788

rate the post if it helps

regards

Devang

New Member

Re: Question about the command : logging synchronous

Hi Devang,

thanks for your replay. i found this link also on the cisco side but i can't find the right explanation about the command.

but however thank you for your help

regards

Klaus

Re: Question about the command : logging synchronous

hi klaus,

thanks for your reply...link i had sent is some what complicated but ankur had given you very nice explanation.

actully this command contorol the log messeges to user terminal's...normaly messges are printed when we are going to have some configuration so it is disturbing us some time...so this command tell the router to wait untile the user's current command and its output completed before displaying logging messages.

keep in mind this command allow to complete user's command as well as it out put...and then log messeges are printed on screen

thanks again

regards

Devang

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