[mrtg] Interface index independence using interface description on Cisco...

[Sandu Mihai]

Quoting from mrtg (v. 2.9.0preXX) in MRTG_lib.pm:

sub populateconfcache ($$$) {
    my $confcache = shift;
    my $host = shift;
    my $reread = shift;
    return if defined $$confcache{$host} and not $reread;
    # clear confcache for host;
    $$confcache{$host} = undef;
    $$confcache{'...UPDATED'} = 1;
    my @ret = snmpwalk($host, "ifDescr");
				^^^^^^^^
				     | VERY BIG MISTAKE (at least on Cisco)!
    foreach my $ret (@ret)

Well, now. On Cisco, you might use a description in your config file. You
can find it at:
	.1.3.6.1.4.1.9.2.2.1.1.28

A snmpwalk .1.3.6.1.4.1.9.2.2.1.1.28 will give something like:
	.1.3.6.1.4.1.9.2.2.1.1.28.X = "your description for this interface"

So, matching your string, you'll find the interface index. But. ifDescr
seems to return the 'common' name of the
interface ('Ethernet0', 'FastEthernet1/0' and so on...). Which is quite
annoying. I'll make a quick hack for that (an option or something.)


All my best,
	Sandu Mihai  - KPNQwest Romania Network Engineer



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