Is this an appropriate venue to ask about the perl SNMP routines?
I am using the package version 5.7.3 on Ubuntu 15.40.
Generally it is working, but I have one routine that attempts to query a cisco
table as below, and in most cases it works, but for one large ASA with a lot of
tunnels, it fails to return all rows in the table, returning what appears to be
a random subset of about half of them. Using the snmpwalk command works fine.
The code is as follows:
my %snmpparms;
$snmpparms{Community} = $community;
$snmpparms{DestHost} = inet_ntoa(inet_aton($IP));
$snmpparms{Version} = "2";
$snmpparms{UseSprintValues} = '1';
$snmpparms{UseEnums} = '0';
$snmpparms{UseNumeric} = '0';
$snmpparms{NonIncreasing} = '1';
$snmpparms{Timeout}=10000000; # need long timeout for large tables over
WAN
$sess = new SNMP::Session(%snmpparms);
# Now pull in the correlation table so we know which are real tunnels
my $RtnCorrHash = (
$sess->gettable('CISCO-IPSEC-FLOW-MONITOR-MIB::cikePeerCorrTable') );
I've tried various combinations of the options in the session parameters
without any change. I've also tried placing a column list on the gettable
without any change.
I had this same problem with another large table and just converted it to
specific calls to getbulk, but I rather liked using gettable in this case.
There is no error returned from the gettable call. The data returned is
correct just incomplete.
There are 54 items in the table, and each one looks sort of like this; only 25
rows were returned the last few times I tried (I am not sure if it always stops
at 25 or not):
'1.13.51.56.46.49.52.48.46.49.51.52.46.49.56.1.11.53.48.46.50.52.49.46.50.46.55.55.500.25126'
=> {
'cikePeerCorrIntIndex' => '500',
'cikePeerCorrRemoteValue' => '50.xxx.xxx.77',
'cikePeerCorrRemoteType' => '1',
'cikePeerCorrSeqNum' => '25126',
'cikePeerCorrIpSecTunIndex' => '25126',
'cikePeerCorrLocalValue' => '38.xxx.xxx.18',
'cikePeerCorrLocalType' => '1'
},
The Cisco device is fairly new and on a high speed LAN; snmpwalk returns data
very quickly, so I do not think this is some kind of timeout issue or anything
related to packet fragmentation. I am pulling a lot of data from it via zabbix
and all those queries work fine.
Any ideas why it will not return all values?
Linwood
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