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тАО06-18-2004 01:12 AM
тАО06-18-2004 01:12 AM
SNMP IP trace analysis needed
I captured an IP trace (enclosed).
Anyone able to make something of it ?
(why is the device responding twice ? when it is working, it doesn't do that)
If you want to simulate it :
mc tcpip$snmp_request IP public getnext -l 1.3.6.1.4.1
where IP is the address of the snmp agent
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тАО06-18-2004 03:11 AM
тАО06-18-2004 03:11 AM
Re: SNMP IP trace analysis needed
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тАО06-18-2004 06:18 AM
тАО06-18-2004 06:18 AM
Re: SNMP IP trace analysis needed
My first take would be to look at the network and see if you have any packet loss, corruption, excessive collisions (collisions are okay, the excessive collisions are not), etc. as well as the machine processing the snmp packets received and its nic cards, etc.
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тАО06-30-2004 03:19 AM
тАО06-30-2004 03:19 AM
Re: SNMP IP trace analysis needed
I verified all sanswitch IP counters and settings. No problems.
This is a double sanswitch with identical software : 1 works fine and 1 has the problem.
They are in the same network.
Also, when I do the snmp dump interactively or, in general, outside its normal dcl procedure of 4000 lines, it works fine.
Now I "disabled" about 3000 lines of it and the problem is still there. The first execution of the snmp dump however works fine.
I tried it starting from another cluster : same problem but with different frequency.
It seems that something is influencing the program.
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тАО07-01-2004 02:43 AM
тАО07-01-2004 02:43 AM
Re: SNMP IP trace analysis needed
I run it at prio 5.
1 sanswitch gives the problem all the time. 5 others almost never.
when simply done in a 4 line dcl procedure : never a problem (never=batch, interactive, detached)
when done in a bigger environemnt : batch and detached have problems, interactive works fine.
Ran it on a GS160 instead of a 4100. At least 4 times less failures. But still failures.
WHY WHY WHY !!!
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тАО07-15-2004 02:21 AM
тАО07-15-2004 02:21 AM
Re: SNMP IP trace analysis needed
Note that I rebooted the switch multiple times !
How this can be related to interactively working, detached not, etc ... I don't know.
Wim
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тАО07-15-2004 02:24 AM
тАО07-15-2004 02:24 AM
Re: SNMP IP trace analysis needed
http://www.ethereal.com/
and have a look at
How to run an IP trace using TCPIP Services for OpenVMS
http://h18000.www1.hp.com/support/askkcs/hpcg/1_0_2985185_2748042.html
while it does not apply strictly, it may help you analyze your trace.
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тАО07-15-2004 02:28 AM
тАО07-15-2004 02:28 AM
Re: SNMP IP trace analysis needed
Wim
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тАО02-01-2006 07:19 PM
тАО02-01-2006 07:19 PM
Re: SNMP IP trace analysis needed
The SANSWITCHES almost daily refused to reply correctly to snmp dumps.
I discovered that if you restart it 10 minutes later it fails again. However, if you restart it immediately it works fine and the next time it fails again.
So, I now try it, if it says "no reply" I try again and when it says again "no reply" I give an alarm. No alarms yet so it is working.
Must be some kind of timeout bug.
Wim
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тАО02-07-2006 08:08 PM
тАО02-07-2006 08:08 PM
Re: SNMP IP trace analysis needed
Reprogrammed it and now I do a loop of maximum 10 times. I continue until it works or until I reach the end.
Until know, the maximum number of retries is 2, meaning that I had to do sndmp_request 3 times before it worked.
Wim