NAME
    Net::SNMP::Mixin::NXOSDot1dStp - mixin class for 802.1D spanning tree
    information from Cisco NXOS devices.

VERSION
    Version 0.01

SYNOPSIS
      use Net::SNMP;
      use Net::SNMP::Mixin;

      my $session = Net::SNMP->session( -hostname => 'foo.bar.com' );
      $session->mixer('Net::SNMP::Mixin::NXOSDot1dStp');
      $session->init_mixins;

      snmp_dispatcher();
      $session->init_ok();
      die $session->errors if $session->errors;

      my $stp_group = $session->get_dot1d_stp_group;

      printf "TopoChanges:    %d\n", $stp_group->{dot1dStpTopChanges};
      printf "LastChange:     %s\n", $stp_group->{dot1dStpTimeSinceTopologyChange};
      printf "ThisRootPort:   %d\n", $stp_group->{dot1dStpRootPort};
      printf "ThisRootCost:   %d\n", $stp_group->{dot1dStpRootCost};
      printf "ThisStpPrio:    %d\n", $stp_group->{dot1dStpPriority};
      printf "RootBridgeMAC:  %s\n", $stp_group->{dot1dStpDesignatedRootAddress};
      printf "RootBridgePrio: %d\n", $stp_group->{dot1dStpDesignatedRootPriority};

      my $stp_ports = $session->get_dot1d_stp_port_table;
      foreach my $port ( sort { $a <=> $b } keys %$stp_ports ) {
        my $enabled = $stp_ports->{$port}{dot1dStpPortEnable};
        next unless defined $enabled && $enabled == 1;

        printf "----------- STP Port: %d ---------\n", $port;
        printf "PState:      %d\n", $stp_ports->{$port}{dot1dStpPortState};
        printf "PStateStr:   %d\n", $stp_ports->{$port}{dot1dStpPortStateString};
        printf "PPrio:       %d\n", $stp_ports->{$port}{dot1dStpPortPriority};
        printf "PCost:       %d\n", $stp_ports->{$port}{dot1dStpPortPathCost};
        printf "PDesigCost:  %d\n", $stp_ports->{$port}{dot1dStpPortDesignatedCost};
        printf "DBridgePrio: %d\n", $stp_ports->{$port}{dot1dStpPortDesignatedBridgePriority};
        printf "DBridgeMAC:  %d\n", $stp_ports->{$port}{dot1dStpPortDesignatedBridgeAddress};
        printf "DPortPrio:   %d\n", $stp_ports->{$port}{dot1dStpPortDesignatedPortPriority};
        printf "DPortNr:     %d\n", $stp_ports->{$port}{dot1dStpPortDesignatedPortNumber};
      }

DESCRIPTION
    This mixin reads data from the dot1dStp group out of the BRIDGE-MIB.
    Normally it's implemented by those bridges that support the Spanning
    Tree Protocol. For Cisco NXOS devices the mst-0 context is used behind
    the scenes.

MIXIN METHODS
  OBJ->get_dot1d_stp_group()
    Returns the dot1dStp group as a hash reference:

      {
        dot1dStpProtocolSpecification   => INTEGER,
        dot1dStpPriority                => INTEGER,
        dot1dStpTimeSinceTopologyChange => TIME_TICKS,
        dot1dStpTopChanges              => COUNTER,
        dot1dStpRootCost                => INTEGER,
        dot1dStpRootPort                => INTEGER,
        dot1dStpMaxAge                  => TIMEOUT,
        dot1dStpHelloTime               => TIMEOUT,
        dot1dStpHoldTime                => INTEGER,
        dot1dStpForwardDelay            => TIMEOUT,
        dot1dStpBridgeMaxAge            => TIMEOUT,
        dot1dStpBridgeHelloTime         => TIMEOUT,
        dot1dStpBridgeForwardDelay      => TIMEOUT,
        dot1dStpDesignatedRoot          => BridgeId,
        dot1dStpDesignatedRootPriority => INTEGER,
        dot1dStpDesignatedRootAddress  => MacAddress,
      }

    The dot1dStpDesignatedRoot is a BridgeId struct of priority and
    MacAddress. The mixin method splits this already into
    dot1dStpDesignatedRootPriority and dot1dStpDesignatedRootAddress for
    your convenience.

  OBJ->get_dot1d_stp_port_table()
    Returns the dot1dStpPortTable as a hash reference. The keys are the
    dot1d STP port numbers for which this entry contains Spanning Tree
    Protocol management information:

      {
        INTEGER => { # dot1dStpPort 

          dot1dStpPortPriority           => INTEGER,
          dot1dStpPortState              => INTEGER,
          dot1dStpPortStateString        => String,
          dot1dStpPortEnable             => INTEGER,
          dot1dStpPortPathCost           => INTEGER,
          dot1dStpPortDesignatedRootId   => BridgeId,
          dot1dStpPortDesignatedCost     => INTEGER,
          dot1dStpPortDesignatedBridgeId => BridgeId,
          dot1dStpPortDesignatedPort     => PortId,
          dot1dStpPortForwardTransitions => COUNTER,

          # dot1dStpPortDesignatedRootId is a struct (BridgeId) of
          # priority and MacAddress
          #
          dot1dStpPortDesignatedRootPriority => INTEGER,
          dot1dStpPortDesignatedRootAddress  => MacAddress,

          # dot1dStpPortDesignatedBridgeId is a struct (BridgeId) of
          # priority and MacAddress
          #
          dot1dStpPortDesignatedBridgePriority => INTEGER,
          dot1dStpPortDesignatedBridgeAddress  => MacAddress,

          # dot1dStpPortDesignatedPort is a struct (PortId) of
          # priority and bridge port number
          #
          dot1dStpPortDesignatedPortPriority => INTEGER,
          dot1dStpPortDesignatedPortNumber   => INTEGER,

          },

        ... ,
      }

    The structs BridgeId and PortId are already splitted by this mixin
    method into the relevant values for your convenience.

    The dot1dStpPort has the same value as the dot1dBasePort and isn't
    necessarily the ifIndex of the switch.

    See also the Net::SNMP::Mixin::Dot1dBase for a mixin to get the mapping
    between the ifIndexes and the dot1dBasePorts if needed.

INITIALIZATION
  OBJ->_init($reload)
    Fetch the dot1dSTP related snmp values from the host. Don't call this
    method direct!

PRIVATE SUBROUTINES
  _fetch_dot1d_stp_group($session)
    Fetch the local system data from the dot1dStp tree once during object
    initialization.

  _dot1d_stp_group_cb($session)
    The callback for _fetch_dot1d_stp_group.

  _fetch_dot1d_stp_port_tbl($session)
    Fetch the dot1dStpPortTable once during object initialization.

  _dot1d_stp_port_tbl_cb($session)
    The callback for _fetch_dot1d_stp_port_tbl().

  _unpack_bridge_id($bridgeId)
    Split a bridge id in priority and MAC address. Returns a list of
    (bridgePrio, bridgeMac).

  _unpack_bridge_port_id($bridgePortId)
    Split a bridge port id in priority and bridge port number. Returns a
    list of (portPrio, portNumber).

LIMITATIONS
    Due to the hack with the mst-0 context behind the scenes, this is
    currently NOT supported for SNMPv3.

SEE ALSO
    Net::SNMP::Mixin::Dot1dBase

REQUIREMENTS
    Net::SNMP, Net::SNMP::Mixin

BUGS, PATCHES & FIXES
    There are no known bugs at the time of this release. However, if you
    spot a bug or are experiencing difficulties that are not explained
    within the POD documentation, please submit a bug to the RT system (see
    link below). However, it would help greatly if you are able to pinpoint
    problems or even supply a patch.

    Fixes are dependant upon their severity and my availablity. Should a fix
    not be forthcoming, please feel free to (politely) remind me by sending
    an email to gaissmai@cpan.org .

      RT: http://rt.cpan.org/Public/Dist/Display.html?Name=Net-SNMP-Mixin-NXOSDot1dStp

AUTHOR
    Karl Gaissmaier <karl.gaissmaier at uni-ulm.de>

COPYRIGHT & LICENSE
    Copyright 2020 Karl Gaissmaier, all rights reserved.

    This program is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself.