[c-nsp] Extremely slow performing show running-config

[Eric Pedersen]

We had a problem with really slow config access with modular IOS on
sup720s.  It took several minutes to do show running-config or write
mem.  I don't remember the version, but switching back to non-modular
IOS fixed it.

 

 

 

 

Hi there

 

I have a strange problem with a pair of cat6509s. Both are connected to
each other via OSPF and IBGP, with EBGP with my upstream providers.

 

Whenever I use show running-config, it will pause for an extremely long
time after the line "Building Configuration". It happens from either
console or telnet sessions. At first I thought it was a CPU or memory
problem, but "show proc cpu" and "show proc mem" shows nothing out of
the ordinary (cpu less than 20% and memory with more than 256M free).
Rebooting both machines doesn't solve the problem either.

 

After further investigations, I found out that the same problem occurs
when I do the following as well.

 

1) copy running-config startup-config

2) write memory

 

Show startup-config does not have this problem.

 

>From what I see, it looks like a problem with NVRAM. Also predictably, 

>the

session doing any of the 3 commands will lock the NVRAM preventing other
sessions from doing a show startup-config as well. Killing the session
(clear line vty or clear line console) that are doing any of the 3
command doesn't seem to kill the session at all.

 

It doesn't seem to be a hardware issue as both cat6509s display the same
problem since early this month at the same time.

 

Any insights on this will be greatly appreciated.

 

Thanks.

 

/Jason