Question for NAV Users with Cisco 3750 Stacks

Discussion:

Greg Cooper

2011-11-16 15:20:55 UTC

Hi, All.

I'm looking for some input from anyone using NAV with Cisco 3750 switch
stacks. If you have a stack of 2 or more 3750's and all the L2/L3
interfaces are being properly pulled from it by NAV, then would you mind
sharing what version of IOS you are using?

I think I may be running into an SNMP issue with the particular version of
IOS I'm on. I get timeouts when querying the 3750 via SNMP. I can do an
snmpwalk from the NAV server to the device, and it runs for a while, but it
will sometimes time out.

Thanks!

Greg

Miloslav Izar

2011-11-16 19:08:33 UTC

Permalink

Hi Greg,

We've got some with 12.2(46)SE and 12.2(52)SE.
Nevertheless we had some similar issues until I patched twisted-snmp
(contrib/patches).
I'm not so sure if it still matters because a lot had been rewritten
since then.

https://bugs.launchpad.net/nav/+bug/690723

milo

Post by Greg Cooper
Hi, All.
I'm looking for some input from anyone using NAV with Cisco 3750
switch stacks. If you have a stack of 2 or more 3750's and all the
L2/L3 interfaces are being properly pulled from it by NAV, then would
you mind sharing what version of IOS you are using?
I think I may be running into an SNMP issue with the particular
version of IOS I'm on. I get timeouts when querying the 3750 via
SNMP. I can do an snmpwalk from the NAV server to the device, and it
runs for a while, but it will sometimes time out.
Thanks!
Greg

Seb Rupik

2011-11-17 08:13:19 UTC

Permalink

Hi Greg,
We're running stacks comprised of all 3750G-48TS, 3750X-48 or a mixture
of both. Any stacks with 3750G-48TS units are running 12.2(44)SE, if any
3750X-48 are present the stack is running 12.2(53r)SE and if pure
3750X-48 then 12.2(53)SE2.

cheers,
Seb.

Morten Brekkevold

2011-11-17 09:08:15 UTC

Permalink

Post by Greg Cooper
I think I may be running into an SNMP issue with the particular version of
IOS I'm on. I get timeouts when querying the 3750 via SNMP. I can do an
snmpwalk from the NAV server to the device, and it runs for a while, but it
will sometimes time out.

Could you please try replacing snmpwalk with snmpbulkwalk, adding the
option "-Cr50" and see if the timeout problem gets worse/better?

Using bulkwalk with a max-repetitions value of 50 will mimic ipdevpoll's
requests more closely. I've seen some devices slow to a crawl when
asked to produce a large bulk response (something which would normally
reduce lag in snmp operations).

--
Morten Brekkevold
UNINETT

Borge Brunes

2011-11-21 14:29:52 UTC

Permalink

Post by Greg Cooper
I'm looking for some input from anyone using NAV with Cisco 3750 switch
stacks. If you have a stack of 2 or more 3750's and all the L2/L3 interfaces
are being properly pulled from it by NAV, then would you mind sharing what
version of IOS you are using?

[cut]

Seems to be working fine with
12.2(55)SE4 (c3750-ipbasek9-mz.122-55.SE4.bin)

regards,

--
Borge Brunes, Computer Center, University of Tromso, Norway
http://www.cc.uit.no/~borge/ | http://www.freebsd.org

Greg Cooper

2011-11-21 18:03:56 UTC

Permalink

Thanks, Borge. I am going to upgrade to that version of code this weekend.

Morten, I'll try this upgrade first, and then send the results of the
snmpbulkwalk if it doesn't help.

Thanks!!

Greg

Post by Greg Cooper

Post by Greg Cooper
I'm looking for some input from anyone using NAV with Cisco 3750 switch
stacks. If you have a stack of 2 or more 3750's and all the L2/L3

interfaces

Post by Greg Cooper
are being properly pulled from it by NAV, then would you mind sharing

what

Post by Greg Cooper
version of IOS you are using?

[cut]
Seems to be working fine with
12.2(55)SE4 (c3750-ipbasek9-mz.122-55.SE4.bin)
regards,
--
Borge Brunes, Computer Center, University of Tromso, Norway
http://www.cc.uit.no/~borge/ | http://www.freebsd.org