2509 with Octal cable - Large number of Overruns?

Unanswered Question
Sep 30th, 2009

Hi,

Setting up a 2509 for oob console access, and am seeing large numbers of overruns:

OOB-01-SYD#sh line

Tty Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int

0 CTY - - - - - 0 0 0/0 -

I 1 TTY 9600/9600 - - - - - 0 0 0/0 -

2 TTY 9600/9600 - - - - - 0 0 0/0 -

3 TTY 9600/9600 - - - - - 1 0 0/0 -

* 4 TTY 9600/9600 - - - - - 1 78 702/2096 -

5 TTY 9600/9600 - - - - - 1 15 775/2333 -

6 TTY 9600/9600 - - - - - 0 0 0/0 -

7 TTY 9600/9600 - - - - - 0 0 0/0 -

8 TTY 9600/9600 - - - - - 5 3340 0/0 -

9 AUX 9600/9600 - inout - - - 2 0 0/0 -

* 10 VTY - - - - - 10 0 0/0 -

11 VTY - - - - - 0 0 0/0 -

12 VTY - - - - - 0 0 0/0 -

13 VTY - - - - - 0 0 0/0 -

14 VTY - - - - - 0 0 0/0 -

I've tried a different octal cable, but still seeing overruns.

Then on a 2960 switch connected via console to one of the octals, I see large number of overruns also:

#sh line

Tty Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int

* 0 CTY - - - - - 0 2 0/30755582 -

What would be causing this, and is there anything I can do(Config-wise) to stop the overruns - As "sh run" on a connected switch stops after about 17 lines (If I reboot the 2509, it will allow correct console access to connected switches for approx a day before becomming unusable again)

Thanks in advance.

I have this problem too.
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Giuseppe Larosa Thu, 10/01/2009 - 22:39

Hello John,

post sh ver and configuration of lines.

There are some commands that may need to be added.

Hope to help

Giuseppe

johnelliot6 Thu, 10/01/2009 - 23:00

Thanks Giuseppe - I believe I have found a solution.

Enabling software flow control on the connected switches line con 0 has stopped the overrun number increasing(Well for the last few hours anyway)

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