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    if ($oids{ifName}{$a} =~ /\//) {
        @a = split(/\//, $oids{ifName}{$a});
...
        @a = $oids{ifName}{$a};
        @b = $oids{ifName}{$b};
    }

    @a = split m{/}, $oids{ifName}{$a};
    @b = split m{/}, $oids{ifName}{$b};

    if ($a[0] =~ /[A-Za-z]/) {
        $a[0] ne $b[0] ? $a[0] cmp $b[0] : ($a[1] <=> $b[1] ? $a[1] <=
+> 
...
        $a[0] != $b[0] ? $a[0] <=> $b[0] : ($a[1] <=> $b[1] ? $a[1] <=
+> 
+$b[1] : $a[2] <=> $b[2]);
    }

    if ($a[0] =~ /[A-Za-z]/) {
        $a[0] cmp $b[0] || $a[1] <=> $b[1];
...
    else {
        $a[0] <=> $b[0] || $a[1] <=> $b[1];
    }

    $a[0] <=> $b[0] || $a[0] cmp $b[0] || $a[1] <=> $b[1];