# SNMP::Info::CiscoVTP
# $Id$
#
# Copyright (c) 2008 Max Baker changes from version 0.8 and beyond.
#
# Copyright (c) 2003 Regents of the University of California
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#     * Redistributions of source code must retain the above copyright notice,
#       this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#     * Neither the name of the University of California, Santa Cruz nor the
#       names of its contributors may be used to endorse or promote products
#       derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR # ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

package SNMP::Info::CiscoVTP;

use strict;
use Exporter;
use SNMP::Info;

@SNMP::Info::CiscoVTP::ISA       = qw/SNMP::Info Exporter/;
@SNMP::Info::CiscoVTP::EXPORT_OK = qw//;

use vars qw/$VERSION %MIBS %FUNCS %GLOBALS %MUNGE/;

$VERSION = '2.06';

%MIBS = (
    'CISCO-VTP-MIB'                       => 'vtpVlanName',
    'CISCO-VLAN-MEMBERSHIP-MIB'           => 'vmMembershipEntry',
    'CISCO-VLAN-IFTABLE-RELATIONSHIP-MIB' => 'cviRoutedVlanIfIndex',
);

%GLOBALS = (
    'vtp_version'          => 'vtpVersion',
    'vtp_maxstore'         => 'vtpMaxVlanStorage',
    'vtp_notify'           => 'vtpNotificationsEnabled',
    'vtp_notify_create'    => 'vtpVlanCreatedNotifEnabled',
    'vtp_notify_delete'    => 'vtpVlanDeletedNotifEnabled',
    'vtp_trunk_set_serial' => 'vlanTrunkPortSetSerialNo',
);

%FUNCS = (

    # CISCO-VTP-MIB::managementDomainTable
    'vtp_d_index'     => 'managementDomainIndex',
    'vtp_d_name'      => 'managementDomainName',
    'vtp_d_mode'      => 'managementDomainLocalMode',
    'vtp_d_rev'       => 'managementDomainConfigRevNumber',
    'vtp_d_updater'   => 'managementDomainLastUpdater',
    'vtp_d_last'      => 'managementDomainLastChange',
    'vtp_d_status'    => 'managementDomainRowStatus',
    'vtp_d_tftp'      => 'managementDomainTftpServer',
    'vtp_d_tftp_path' => 'managementDomainTftpPathname',
    'vtp_d_pruning'   => 'managementDomainPruningState',
    'vtp_d_ver'       => 'managementDomainVersionInUse',

    # CISCO-VTP-MIB::vtpVlanTable
    'v_state'    => 'vtpVlanState',
    'v_type'     => 'vtpVlanType',
    'v_name'     => 'vtpVlanName',
    'v_mtu'      => 'vtpVlanMtu',
    'v_said'     => 'vtpVlanDot10Said',
    'v_ring'     => 'vtpVlanRingNumber',
    'v_bridge'   => 'vtpVlanBridgeNumber',
    'v_stp'      => 'vtpVlanStpType',
    'v_parent'   => 'vtpVlanParentVlan',
    'v_trans1'   => 'vtpVlanTranslationalVlan1',
    'v_trans2'   => 'vtpVlanTranslationalVlan2',
    'v_btype'    => 'vtpVlanBridgeType',
    'v_hop_are'  => 'vtpVlanAreHopCount',
    'v_hop_ste'  => 'vtpVlanSteHopCount',
    'v_crf'      => 'vtpVlanIsCRFBackup',
    'v_type_ext' => 'vtpVlanTypeExt',
    'v_if'       => 'vtpVlanIfIndex',

    # CISCO-VLAN-MEMBERSHIP-MIB::vmMembershipTable
    'i_vlan_type' => 'vmVlanType',
    'i_vlan2'     => 'vmVlan',
    'i_vlan_stat' => 'vmPortStatus',
    'i_vlan_1'    => 'vmVlans',
    'i_vlan_2'    => 'vmVlans2k',
    'i_vlan_3'    => 'vmVlans3k',
    'i_vlan_4'    => 'vmVlans4k',

    # CISCO-VLAN-MEMBERSHIP-MIB::vmVoiceVlanTable
    'i_voice_vlan' => 'vmVoiceVlanId',

    # CISCO-VLAN-IFTABLE-RELATIONSHIP-MIB
    'v_cvi_if' => 'cviRoutedVlanIfIndex',

    # CISCO-VTP-MIB::vlanTrunkPortTable
    'vtp_trunk_mgmt_dom' => 'vlanTrunkPortManagementDomain',
    'vtp_trunk_encaps_t' => 'vlanTrunkPortEncapsulationType',
    'vtp_trunk_vlans'    => 'vlanTrunkPortVlansEnabled',
    'vtp_trunk_vlans_2k' => 'vlanTrunkPortVlansEnabled2k',
    'vtp_trunk_vlans_3k' => 'vlanTrunkPortVlansEnabled3k',
    'vtp_trunk_vlans_4k' => 'vlanTrunkPortVlansEnabled4k',
    'vtp_trunk_native'   => 'vlanTrunkPortNativeVlan',
    'i_pvid'             => 'vlanTrunkPortNativeVlan',
    'vtp_trunk_rstat'    => 'vlanTrunkPortRowStatus',
    'vtp_trunk_dyn'      => 'vlanTrunkPortDynamicState',
    'vtp_trunk_dyn_stat' => 'vlanTrunkPortDynamicStatus',
    'vtp_trunk_vtp'      => 'vlanTrunkPortVtpEnabled',
    'vtp_trunk_encaps'   => 'vlanTrunkPortEncapsulationOperType',

    # TODO Add these tables if someone wants them..
    # vtpEditControlTable
    # vtpVlanEditTable
    # vtpStatsTable
);

%MUNGE = ();

sub v_index {
    my $vtp     = shift;
    my $partial = shift;

    my $v_name = $vtp->v_name($partial);
    my %v_index;
    foreach my $idx ( keys %$v_name ) {
        my ( $mgmtdomain, $vlan ) = split( /\./, $idx );
        $v_index{$idx} = $vlan;
    }
    return \%v_index;
}

sub i_vlan {
    my $vtp     = shift;
    my $partial = shift;

    my $port_vlan      = $vtp->vtp_trunk_native($partial)   || {};
    my $i_vlan         = $vtp->i_vlan2($partial)            || {};
    my $trunk_dyn_stat = $vtp->vtp_trunk_dyn_stat($partial) || {};

    my %i_vlans;

    # Get access ports
    foreach my $port ( keys %$i_vlan ) {
        my $vlan = $i_vlan->{$port};
        next unless defined $vlan;

        $i_vlans{$port} = $vlan;
    }

    # Get trunk ports
    foreach my $port ( keys %$port_vlan ) {
        my $vlan = $port_vlan->{$port};
        next unless defined $vlan;
        my $stat = $trunk_dyn_stat->{$port};
        if ( defined $stat and $stat =~ /^trunking/ ) {
            $i_vlans{$port} = $vlan;
        }
    }

    # Check in CISCO-VLAN-IFTABLE-RELATION-MIB
    # Is this only for Aironet???  If so, it needs
    # to be removed from this class

    my $v_cvi_if = $vtp->v_cvi_if();
    if ( defined $v_cvi_if ) {

        # Translate vlan.physical_interface -> iid
        #       to iid -> vlan
        foreach my $i ( keys %$v_cvi_if ) {
            my ( $vlan, $phys ) = split( /\./, $i );
            my $iid = $v_cvi_if->{$i};

            $i_vlans{$iid} = $vlan;
        }
    }

    return \%i_vlans;
}

sub i_vlan_membership {
    my $vtp     = shift;
    my $partial = shift;

    my $ports_vlans    = $vtp->vtp_trunk_vlans($partial)    || {};
    my $ports_vlans_2k = $vtp->vtp_trunk_vlans_2k($partial) || {};
    my $ports_vlans_3k = $vtp->vtp_trunk_vlans_3k($partial) || {};
    my $ports_vlans_4k = $vtp->vtp_trunk_vlans_4k($partial) || {};
    my $vtp_vlans      = $vtp->v_state();
    my $i_vlan         = $vtp->i_vlan2($partial)            || {};
    my $trunk_dyn_stat = $vtp->vtp_trunk_dyn_stat($partial) || {};

    my $i_vlan_membership = {};

    # Get access ports
    foreach my $port ( keys %$i_vlan ) {
        my $vlan = $i_vlan->{$port};
        next unless defined $vlan;
        my $stat = $trunk_dyn_stat->{$port};
        if ( defined $stat and $stat =~ /notTrunking/ ) {
            push( @{ $i_vlan_membership->{$port} }, $vlan );
        }
    }

    # Get trunk ports

    my %oper_vlans;
    foreach my $iid ( keys %$vtp_vlans ) {
        my $vlan    = 0;
        my $vtp_dom = 0;
        my $state   = $vtp_vlans->{$iid};
        next unless defined $state;
        next if $state !~ /operational/;
        if ( $iid =~ /(\d+)\.(\d+)/ ) {
            $vtp_dom = $1;
            $vlan    = $2;
        }
        $oper_vlans{$vlan}++;
    }

    foreach my $port ( keys %$ports_vlans ) {
        my $stat = $trunk_dyn_stat->{$port};
        if ( defined $stat and $stat =~ /^trunking/ ) {
            my $k     = 0;
            my $list1 = $ports_vlans->{$port} || '0';
            my $list2 = $ports_vlans_2k->{$port} || '0';
            my $list3 = $ports_vlans_3k->{$port} || '0';
            my $list4 = $ports_vlans_4k->{$port} || '0';
            foreach my $list ( "$list1", "$list2", "$list3", "$list4" ) {
                my $offset = 1024 * $k++;
                next unless $list;
                my $vlanlist = [ split( //, unpack( "B*", $list ) ) ];
                foreach my $vlan ( keys %oper_vlans ) {
                    push( @{ $i_vlan_membership->{$port} }, $vlan )
                        if ( @$vlanlist[ $vlan - $offset ] );
                }
            }
        }
    }

    return $i_vlan_membership;
}

sub set_i_pvid {
    my $vtp = shift;
    my ( $vlan_id, $ifindex ) = @_;

    return unless ( $vtp->_validate_vlan_param( $vlan_id, $ifindex ) );

    my $native_vlan = $vtp->vtp_trunk_native($ifindex);
    if ( defined $native_vlan ) {

        print
            "Changing native VLAN from $native_vlan->{$ifindex} to $vlan_id on IfIndex: $ifindex\n"
            if $vtp->debug();

        my $rv = $vtp->set_vtp_trunk_native( $vlan_id, $ifindex );
        unless ($rv) {
            $vtp->error_throw(
                "Unable to change native VLAN to $vlan_id on IfIndex: $ifindex"
            );
            return;
        }
        return $rv;
    }
    $vtp->error_throw("Can't find ifIndex: $ifindex - Is it a trunk port?");
    return;
}

sub set_i_vlan {
    my $vtp = shift;
    my ( $vlan_id, $ifindex ) = @_;

    return unless ( $vtp->_validate_vlan_param( $vlan_id, $ifindex ) );

    my $i_vlan = $vtp->i_vlan2($ifindex);
    if ( defined $i_vlan ) {

        print
            "Changing VLAN from $i_vlan->{$ifindex} to $vlan_id on IfIndex: $ifindex\n"
            if $vtp->debug();

        my $rv = $vtp->set_i_vlan2( $vlan_id, $ifindex );
        unless ($rv) {
            $vtp->error_throw(
                "Unable to change VLAN to $vlan_id on IfIndex: $ifindex");
            return;
        }
        return $rv;
    }
    $vtp->error_throw("Can't find ifIndex: $ifindex - Is it an access port?");
    return;
}

sub set_add_i_vlan_tagged {
    my $vtp = shift;
    my ( $vlan_id, $ifindex ) = @_;

    return unless ( $vtp->_validate_vlan_param( $vlan_id, $ifindex ) );

    print "Adding VLAN: $vlan_id to ifIndex: $ifindex\n" if $vtp->debug();

    my $trunk_serial  = $vtp->load_vtp_trunk_set_serial();
    my $trunk_members = $vtp->vtp_trunk_vlans($ifindex);

    unless ( defined $trunk_members ) {
        $vtp->error_throw(
            "Can't find ifIndex: $ifindex - Is it a trunk port?");
        return;
    }

    my @member_list = split( //, unpack( "B*", $trunk_members->{$ifindex} ) );

    print "Original vlan list for ifIndex: $ifindex: @member_list \n"
        if $vtp->debug();
    $member_list[$vlan_id] = '1';
    print "Modified vlan list for ifIndex: $ifindex: @member_list \n"
        if $vtp->debug();
    my $new_list = pack( "B*", join( '', @member_list ) );

    #Add VLAN to member list
    my $list_rv = $vtp->set_vtp_trunk_vlans( $new_list, $ifindex );
    unless ($list_rv) {
        $vtp->error_throw(
            "Unable to add VLAN: $vlan_id to ifIndex: $ifindex member list");
        return;
    }

   #Make sure no other SNMP manager was making modifications at the same time.
    my $serial_rv = $vtp->set_vtp_trunk_set_serial($trunk_serial);
    unless ($serial_rv) {
        $vtp->error_throw(
            "Unable to increment trunk set serial number - check configuration!"
        );
        return;
    }
    return 1;
}

sub set_remove_i_vlan_tagged {
    my $vtp = shift;
    my ( $vlan_id, $ifindex ) = @_;

    return unless ( $vtp->_validate_vlan_param( $vlan_id, $ifindex ) );

    print "Removing VLAN: $vlan_id from ifIndex: $ifindex\n" if $vtp->debug();

    my $trunk_serial  = $vtp->load_vtp_trunk_set_serial();
    my $trunk_members = $vtp->vtp_trunk_vlans($ifindex);

    unless ( defined $trunk_members ) {
        $vtp->error_throw(
            "Can't find ifIndex: $ifindex - Is it a trunk port?");
        return;
    }

    my @member_list = split( //, unpack( "B*", $trunk_members->{$ifindex} ) );

    print "Original vlan list for ifIndex: $ifindex: @member_list \n"
        if $vtp->debug();
    $member_list[$vlan_id] = '0';
    print "Modified vlan list for ifIndex: $ifindex: @member_list \n"
        if $vtp->debug();
    my $new_list = pack( "B*", join( '', @member_list ) );

    #Remove VLAN to member list
    my $list_rv = $vtp->set_vtp_trunk_vlans( $new_list, $ifindex );
    unless ($list_rv) {
        $vtp->error_throw(
            "Error: Unable to remove VLAN: $vlan_id from ifIndex: $ifindex member list"
        );
        return;
    }

    #Make sure no other manager was making modifications at the same time.
    my $serial_rv = $vtp->set_vtp_trunk_set_serial($trunk_serial);
    unless ($serial_rv) {
        $vtp->error_throw(
            "Error: Unable to increment trunk set serial number - check configuration!"
        );
        return;
    }
    return 1;
}

#
# These are internal methods and are not documented.  Do not use directly.
#
sub _validate_vlan_param {
    my $vtp = shift;
    my ( $vlan_id, $ifindex ) = @_;

    # VID and ifIndex should both be numeric
    unless (defined $vlan_id
        and defined $ifindex
        and $vlan_id =~ /^\d+$/
        and $ifindex =~ /^\d+$/ )
    {
        $vtp->error_throw("Invalid parameter");
        return;
    }

    # Check that ifIndex exists on device
    my $index = $vtp->interfaces($ifindex);

    unless ( exists $index->{$ifindex} ) {
        $vtp->error_throw("ifIndex $ifindex does not exist");
        return;
    }

    #Check that VLAN exists on device
    my $vtp_vlans   = $vtp->v_state();
    my $vlan_exists = 0;

    foreach my $iid ( keys %$vtp_vlans ) {
        my $vlan    = 0;
        my $vtp_dom = 0;
        my $state   = $vtp_vlans->{$iid};
        next unless defined $state;
        next if $state !~ /operational/;
        if ( $iid =~ /(\d+)\.(\d+)/ ) {
            $vtp_dom = $1;
            $vlan    = $2;
        }

        $vlan_exists = 1 if ( $vlan_id eq $vlan );
    }
    unless ($vlan_exists) {
        $vtp->error_throw(
            "VLAN $vlan_id does not exist or is not operational");
        return;
    }

    return 1;
}

1;
__END__

=head1 NAME

SNMP::Info::CiscoVTP - SNMP Interface to Cisco's VLAN Management MIBs

=head1 AUTHOR

Max Baker

=head1 SYNOPSIS

 # Let SNMP::Info determine the correct subclass for you. 
 my $vtp = new SNMP::Info(
                          AutoSpecify => 1,
                          Debug       => 1,
                          DestHost    => 'myswitch',
                          Community   => 'public',
                          Version     => 2
                        ) 
    or die "Can't connect to DestHost.\n";

 my $class = $vtp->class();
 print "SNMP::Info determined this device to fall under subclass : $class\n";

=head1 DESCRIPTION

SNMP::Info::CiscoVTP is a subclass of SNMP::Info that provides 
information about a Cisco device's VLAN and VTP Domain membership.

Use or create in a subclass of SNMP::Info.  Do not use directly.

=head2 Inherited Classes

None.

=head2 Required MIBs

=over

=item F<CISCO-VTP-MIB>

=item F<CISCO-VLAN-MEMBERSHIP-MIB>

=item F<CISCO-VLAN-IFTABLE-RELATIONSHIP-MIB>

=back

MIBs can be found at ftp://ftp.cisco.com/pub/mibs/v2/v2.tar.gz

=head1 GLOBALS

=over

=item $vtp->vtp_version()

(C<vtpVersion>)

=item $vtp->vtp_maxstore()

(C<vtpMaxVlanStorage>)

=item $vtp->vtp_notify()

(C<vtpNotificationsEnabled>)

=item $vtp->vtp_notify_create()

(C<vtpVlanCreatedNotifEnabled>)

=item $vtp->vtp_notify_delete()

(C<vtpVlanDeletedNotifEnabled>)

=item $vtp->vtp_trunk_set_serial()

(C<vlanTrunkPortSetSerialNo>)

=back

=head1 TABLE METHODS

Your device will only implement a subset of these methods.

=over

=item $vtp->i_vlan()

Returns a mapping between C<ifIndex> and assigned VLAN ID for access ports
and the default VLAN ID for trunk ports.

=item $vtp->i_vlan_membership()

Returns reference to hash of arrays: key = C<ifIndex>, value = array of VLAN
IDs.  These are the VLANs which are members of enabled VLAN list for the port.

  Example:
  my $interfaces = $vtp->interfaces();
  my $vlans      = $vtp->i_vlan_membership();
  
  foreach my $iid (sort keys %$interfaces) {
    my $port = $interfaces->{$iid};
    my $vlan = join(',', sort(@{$vlans->{$iid}}));
    print "Port: $port VLAN: $vlan\n";
  }

=back

=head2 VLAN Table (C<CISCO-VTP-MIB::vtpVlanTable>)

See L<ftp://ftp.cisco.com/pub/mibs/supportlists/wsc5000/wsc5000-communityIndexing.html>
for a good treaty of how to connect to the VLANs

=over

=item $vtp->v_index()

(C<vtpVlanIndex>)

=item $vtp->v_state()

(C<vtpVlanState>)

=item $vtp->v_type()

(C<vtpVlanType>)

=item $vtp->v_name()

(C<vtpVlanName>)

=item $vtp->v_mtu()

(C<vtpVlanMtu>)

=item $vtp->v_said()

(C<vtpVlanDot10Said>)

=item $vtp->v_ring()

(C<vtpVlanRingNumber>)

=item $vtp->v_bridge()

(C<vtpVlanBridgeNumber>)

=item $vtp->v_stp()

(C<vtpVlanStpType>)

=item $vtp->v_parent()

(C<vtpVlanParentVlan>)

=item $vtp->v_trans1()

(C<vtpVlanTranslationalVlan1>)

=item $vtp->v_trans2()

(C<vtpVlanTranslationalVlan2>)

=item $vtp->v_btype()

(C<vtpVlanBridgeType>)

=item $vtp->v_hop_are()

(C<vtpVlanAreHopCount>)

=item $vtp->v_hop_ste()

(C<vtpVlanSteHopCount>)

=item $vtp->v_crf()

(C<vtpVlanIsCRFBackup>)

=item $vtp->v_type_ext()

(C<vtpVlanTypeExt>)

=item $vtp->v_if()

(C<vtpVlanIfIndex>)

=back

=head2 VLAN Membership Table (C<CISCO-VLAN-MEMBERSHIP-MIB::vmMembershipTable>)

=over

=item $vtp->i_vlan_type()

Static, Dynamic, or multiVlan.  

(C<vmVlanType>)

=item $vtp->i_vlan2()

The VLAN that an access port is assigned to.

(C<vmVlan>)

=item $vtp->i_vlan_stat()

Inactive, active, shutdown.

(C<vmPortStatus>)

=item $vtp->i_vlan_1()

Each bit represents a VLAN.  This is 0 through 1023

(C<vmVlans>)

=item $vtp->i_vlan_2()

Each bit represents a VLAN.  This is 1024 through 2047

(C<vmVlans2k>)

=item $vtp->i_vlan_3()

Each bit represents a VLAN.  This is 2048 through 3071

(C<vmVlans3k>)

=item $vtp->i_vlan_4()

Each bit represents a VLAN.  This is 3072 through 4095

(C<vmVlans4k>)

=back

=head2 VLAN Membership Voice VLAN Table
(C<CISCO-VLAN-MEMBERSHIP-MIB::vmVoiceVlanTable>)

=over

=item $vtp->i_voice_vlan() 

(C<vmVoiceVlanId>)

=back

=head2 Management Domain Table (C<CISCO-VTP-MIB::managementDomainTable>)

=over

=item $vtp->vtp_d_index()

(C<managementDomainIndex>)

=item $vtp->vtp_d_name()

(C<managementDomainName>)

=item $vtp->vtp_d_mode()

(C<managementDomainLocalMode>)

=item $vtp->vtp_d_rev()

(C<managementDomainConfigRevNumber>)

=item $vtp->vtp_d_updater()

(C<managementDomainLastUpdater>)

=item $vtp->vtp_d_last()

(C<managementDomainLastChange>)

=item $vtp->vtp_d_status()

(C<managementDomainRowStatus>)

=item $vtp->vtp_d_tftp()

(C<managementDomainTftpServer>)

=item $vtp->vtp_d_tftp_path()

(C<managementDomainTftpPathname>)

=item $vtp->vtp_d_pruning()

(C<managementDomainPruningState>)

=item $vtp->vtp_d_ver()

(C<managementDomainVersionInUse>)

=back

=head2 VLAN Trunk Port Table (C<CISCO-VTP-MIB::vlanTrunkPortTable>)

=over

=item $vtp->vtp_trunk_mgmt_dom()

(C<vlanTrunkPortManagementDomain>)

=item $vtp->vtp_trunk_encaps_t()

(C<vlanTrunkPortEncapsulationType>)

=item $vtp->vtp_trunk_vlans()

(C<vlanTrunkPortVlansEnabled>)

=item $vtp->vtp_trunk_vlans_2k()

(C<vlanTrunkPortVlansEnabled2k>)

=item $vtp->vtp_trunk_vlans_3k()

(C<vlanTrunkPortVlansEnabled3k>)

=item $vtp->vtp_trunk_vlans_4k()

(C<vlanTrunkPortVlansEnabled4k>)

=item $vtp->vtp_trunk_native()

(C<vlanTrunkPortNativeVlan>)

=item $vtp->i_pvid()

(C<vlanTrunkPortNativeVlan>)

=item $vtp->vtp_trunk_rstat()

(C<vlanTrunkPortRowStatus>)

=item $vtp->vtp_trunk_dyn()

(C<vlanTrunkPortDynamicState>)

=item $vtp->vtp_trunk_dyn_stat()

(C<vlanTrunkPortDynamicStatus>)

=item $vtp->vtp_trunk_vtp()

(C<vlanTrunkPortVtpEnabled>)

=item $vtp->vtp_trunk_encaps()

(C<vlanTrunkPortEncapsulationOperType>)

=back

=head1 SET METHODS

These are methods that provide SNMP set functionality for overridden methods
or provide a simpler interface to complex set operations.  See
L<SNMP::Info/"SETTING DATA VIA SNMP"> for general information on set
operations. 

=over

=item $vtp->set_i_vlan ( vlan, ifIndex )

Changes an access (untagged) port VLAN, must be supplied with the numeric
VLAN ID and port C<ifIndex>.  This method should only be used on end station
(non-trunk) ports.

  Example:
  my %if_map = reverse %{$vtp->interfaces()};
  $vtp->set_i_vlan('2', $if_map{'FastEthernet0/1'}) 
    or die "Couldn't change port VLAN. ",$vtp->error(1);

=item $vtp->set_i_pvid ( pvid, ifIndex )

Sets port default VLAN, must be supplied with the numeric VLAN ID and
port C<ifIndex>.  This method should only be used on trunk ports.

  Example:
  my %if_map = reverse %{$vtp->interfaces()};
  $vtp->set_i_pvid('2', $if_map{'FastEthernet0/1'}) 
    or die "Couldn't change port default VLAN. ",$vtp->error(1);

=item $vtp->set_add_i_vlan_tagged ( vlan, ifIndex )

Adds the VLAN to the enabled VLANs list of the port, must be supplied with the
numeric VLAN ID and port C<ifIndex>.

  Example:
  my %if_map = reverse %{$vtp->interfaces()};
  $vtp->set_add_i_vlan_tagged('2', $if_map{'FastEthernet0/1'}) 
    or die "Couldn't add port to egress list. ",$vtp->error(1);

=item $vtp->set_remove_i_vlan_tagged ( vlan, ifIndex )

Removes the VLAN from the enabled VLANs list of the port, must be supplied
with the numeric VLAN ID and port C<ifIndex>.

  Example:
  my %if_map = reverse %{$vtp->interfaces()};
  $vtp->set_remove_i_vlan_tagged('2', $if_map{'FastEthernet0/1'}) 
    or die "Couldn't add port to egress list. ",$vtp->error(1);

=back

=cut
