To echo salva's comments above re: SNMP, have a look at Cisco::Management which uses Net::SNMP and provides a nice interface for memory utilization:

use Cisco::Management;

my $cm = Cisco::Management->new([OPTIONS]);
my $meminfo = $cm->memory_info();
...
$meminfo->[0]->{'Name', 'Used', 'Free', ...}
$meminfo->[1]->{'Name', 'Used', 'Free', ...}
...
$meminfo->[n]->{'Name', 'Used', 'Free', ...}
...

[download]

The scripts provided in the distribution's bin/ directory provide working examples.

In reply to Re: Monitor memory on a cisco router by VinsWorldcom
in thread Monitor memory on a cisco router by vlad3848

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