show-switch: --force-v1, .1d FDB

diff --git a/show-switch b/show-switch
index 10337597e67780abcee4e8f78e0bb575014de291..0e23fdcdd26f720dbfa7681ca37902bcfcf9c58f 100755 (executable)
--- a/show-switch
+++ b/show-switch
@@ -9,16 +9,26 @@ use Getopt::Long;
 use List::Util;
 
 sub usage {
-       die "Usage: $0 [--debug] [--mac] [--allmac] <ip-addr>\n";
+       die <<AMEN ;
+Usage: $0 [<options>] <ip-addr>
+
+Options:
+--debug                Show debugging outputs
+--mac          Show one MAC address learned per port
+--allmac       Show all MAC addresses learned per port
+--force-v1     Use SNMPv1 (work-around for buggy switches)
+AMEN
 }
 
 my $debug = 0;
 my $mac = 0;
 my $all_mac = 0;
+my $force_v1 = 0;
 GetOptions(
        'debug' => \$debug,
        'mac' => \$mac,
        'allmac' => \$all_mac,
+       'force-v1' => \$force_v1,
 ) or usage;
 
 @ARGV == 1 or usage;
@@ -39,7 +49,7 @@ my $t_norm = attr("sgr0");
 
 my ($snmp, $err) = Net::SNMP->session(
        -hostname => $switch_ip,
-       -version => '2c',
+       -version => ($force_v1 ? '1' : '2c'),
        -community => $community,
 );
 $snmp or die "Cannot establish session: $err\n";
@@ -130,23 +140,40 @@ print Dumper($if_table) if $debug;
 
 if ($mac) {
        my $OID_1qTpFdbTable = '1.3.6.1.2.1.17.7.1.2.2';
-       my $OID_1qPort = "$OID_1qTpFdbTable.1.2";
-       my $OID_1qStatus = "$OID_1qTpFdbTable.1.3";
        my $vlan_fdb_table = my_get_table({
-               'port' => $OID_1qPort,
-               'status' => $OID_1qStatus,
+               'port' => "$OID_1qTpFdbTable.1.2",
+               'status' => "$OID_1qTpFdbTable.1.3",
        });
        print Dumper($vlan_fdb_table) if $debug;
 
-       for my $m (keys %$vlan_fdb_table) {
-               my $fdb = $vlan_fdb_table->{$m};
-               $fdb->{status} == 3 or next;    # Only learned MACs
-               my $port = $if_table->{$fdb->{port}} or die "Forwarding DB refers to unknown iface";
-               my @m = split /\./, $m;
-               my $vlan = shift @m;
-               my $mac = join(':', map { sprintf('%02x', $_) } @m);
-               push @{$port->{macs}}, $mac;
+       if (%$vlan_fdb_table) {
+               for my $m (keys %$vlan_fdb_table) {
+                       my $fdb = $vlan_fdb_table->{$m};
+                       $fdb->{status} == 3 or next;    # Only learned MACs
+                       my $port = $if_table->{$fdb->{port}} or die "Forwarding DB refers to unknown iface";
+                       my @m = split /\./, $m;
+                       my $vlan = shift @m;
+                       my $mac = join(':', map { sprintf('%02x', $_) } @m);
+                       push @{$port->{macs}}, $mac;
+               }
+       } else {
+               print "# Trying fall-fack to .1d FDB\n" if $debug;
+               my $OID_1dTpFdbTable = '1.3.6.1.2.1.17.4.3';
+               my $fdb_table = my_get_table({
+                       'port' => "$OID_1dTpFdbTable.1.2",
+                       'status' => "$OID_1dTpFdbTable.1.3",
+               });
+               print Dumper($fdb_table) if $debug;
+               for my $m (keys %$fdb_table) {
+                       my $fdb = $fdb_table->{$m};
+                       $fdb->{status} == 3 or next;    # Only learned MACs
+                       my $port = $if_table->{$fdb->{port}} or die "Forwarding DB refers to unknown iface";
+                       my @m = split /\./, $m;
+                       my $mac = join(':', map { sprintf('%02x', $_) } @m);
+                       push @{$port->{macs}}, $mac;
+               }
        }
+
        for my $if (values %$if_table) {
                $if->{macs} or next;
                $if->{macs} = [ sort(List::Util::uniq(@{$if->{macs}})) ];