Does it happens only on an SSH session or does it happens also when you simply telnet into the switch? Also does it happens only when you have all five SSH sessions or can it happens when only one SSH session is active. How easily is it to reproduce? Do you have to do "show spanning" repeatedly over many times to reproduce it?
Any info that might help me reproduce the problem is appreciated.
I have tried with both SSH and regular telnet sessions. I have executed the show spanning tree operation more then 50 times on each type of sessions. I also tried with multiple telnet & SSH sessions active. I'm using SSH on cygwin and on Linux. No luck reproducing it.
Can you give me more information please. When you said it locked up on you, does it hangs only the given SSH session so that you can access it with another SSH session? If so maybe something to do with your particular SSH tool. What are you using? Is it SSH that comes with Linux or something on windows?
Does the console show any message when a session "locks up" on you? Any other observation that might help?
I think I figured out the problem. It seems that some SSH clients on windows will seem to lock up when use with the switch. It maybe that the performance on these clients are so slow that they look as if they lock up when executing commands that result in a lot of data being returned (such as "show spanning").
I have downloaded and tried a number of different SSH clients on Windows and I find that there are really three types:
Also when these slower clients are killed they do not release the session which cause the problems you notice where the sessions are locked open. In fact if you are really patience these clients do eventually response just take a VERY long time.
I suggest you use the OpenSSH based clients on windows or the SSHSecureShellClient for better performance.
Ok. Let me try this config on my switch and I will let you know. However, I have been unable to reproduce your problem on my current system using various different SSH implementation on Linux including OpenSSH. Maybe its related to your configuration. Anyway, I will load your config and try it.
Also, have you tried it with just telnet just to eliminate the SSH issue?