SNMP::Info::FDP - SNMP Interface to Foundry Discovery Protocol (FDP) using SNMP


Bruce Rodger, Max Baker


 my $fdp = new SNMP::Info (
                             AutoSpecify => 1,
                             Debug       => 1,
                             DestHost    => 'router',
                             Community   => 'public',
                             Version     => 2

 my $class = $fdp->class();
 print " Using device sub class : $class\n";

 $hasfdp   = $fdp->hasFDP() ? 'yes' : 'no';

 # Print out a map of device ports with FDP neighbors:
 my $interfaces   = $fdp->interfaces();
 my $fdp_if       = $fdp->fdp_if();
 my $fdp_ip       = $fdp->fdp_ip();
 my $fdp_port     = $fdp->fdp_port();

 foreach my $fdp_key (keys %$fdp_ip){
    my $iid           = $fdp_if->{$fdp_key};
    my $port          = $interfaces->{$iid};
    my $neighbor      = $fdp_ip->{$fdp_key};
    my $neighbor_port = $fdp_port->{$fdp_key};
    print "Port : $port connected to $neighbor / $neighbor_port\n";


SNMP::Info::FDP is a subclass of SNMP::Info that provides an object oriented interface to FDP information through SNMP.

FDP is a Layer 2 protocol that supplies topology information of devices that also speak FDP, mostly switches and routers. It has similar functionality to Cisco's CDP, and the SNMP interface is virtually identical. FDP is implemented in Brocade (Foundry) devices.

Create or use a device subclass that inherits this class. Do not use directly.

Each device implements a subset of the global and cache entries. Check the return value to see if that data is held by the device.

Inherited Classes


Required MIBs


Needs a reasonably recent MIB. Works OK with B2R07604A.mib, but doesn't work with B2R07600C.


These are methods that return scalar values from SNMP


Is FDP is active in this device?

Accounts for SNMP version 1 devices which may have FDP but not fdp_run()


Is FDP enabled on this device?



Interval in seconds at which FDP messages are generated.



Time in seconds that FDP messages are kept.



CDP compatibility


Interval in seconds at which FDP messages are generated.



Time in seconds that FDP messages are kept.



Returns FDP device ID.

This is the device id broadcast via FDP to other devices, and is what is retrieved from remote devices with $fdp->id().



Is FDP enabled on this device?


These are methods that return tables of information in the form of a reference to a hash.


CDP compatibility


Returns Device Functional Capabilities. Results are munged into an ascii binary string, MSB. Each digit represents a bit from the table below.


(Bit) - Description

(0x40) - Provides level 1 functionality.
(0x20) - The bridge or switch does not forward IGMP Report packets on non router ports.
(0x10) - Sends and receives packets for at least one network layer protocol. If the device is routing the protocol, this bit should not be set.
(0x08) - Performs level 2 switching. The difference between this bit and bit 0x02 is that a switch does not run the Spanning-Tree Protocol. This device is assumed to be deployed in a physical loop-free topology.
(0x04) - Performs level 2 source-route bridging. A source-route bridge would set both this bit and bit 0x02.
(0x02) - Performs level 2 transparent bridging.
(0x01) - Performs level 3 routing for at least one network layer protocol.

Thanks to Martin Lorensen for a pointer to this information.



Returns remote device id string



Returns the mapping to the SNMP Interface Table.

In order to map the fdp table entry back to the interfaces() entry, we truncate the last number off of it :

  my $fdp_ip       = $device->fdp_ip();

  my %fdp_if
  foreach my $key (keys %$fdp_ip){
      $iid = $key;
      ## Truncate off .1 from fdp response
      $iid =~ s/\.\d+$//;
      $fdp_if{$key} = $iid;

  return \%fdp_if;

Returns remote IP address



Returns remote platform id



Returns remote port ID



Returns remote address type received. Usually IP.



Returns remote hardware version



Returns type of entry received, either FDP or CDP.