Verifying FDP

After enabling FDP you can verify the configuration and view FDP information.

Ensure that FDP has been enabled.

You can display the following Foundry Discovery Protocol (FDP) information:

  • FDP entries for RUCKUS neighbors
  • Individual FDP entries
  • FDP information for an interface on the device you are managing
  • FDP packet statistics

Note: Foundry Discovery Protocol (FDP) packets are blocked at PE interfaces, even when FDP pass-through is configured. However, the packets are still forwarded upstream for processing in the CB. Although FDP neighbors can be displayed within the Campus Fabric domain, for example, with the show fdp neighbor command, no FDP packets are forwarded to non-SPX devices (that is, to devices that are connected to PEs but that are not part of the Campus Fabric domain).

Note: If the RUCKUS device has intercepted CDP updates, then the CDP information is also displayed.
  1. To display a summary list of all the RUCKUS neighbors that have sent FDP updates to this RUCKUS device enter the following command: 
    device# show fdp neighbors

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater
(*) indicates a CDP device
   Device ID      Local Int    Holdtm Capability Platform     Port ID
   -------------- ------------ ------ ---------- ------------ ----------
   deviceB        Eth 1/2/9    178    Router     FastIron Rou Eth 1/2/9
  2. To display detailed information about all the RUCKUS neighbors that have sent FDP updates to this RUCKUS device enter the following command: 
    device# show fdp neighbors detail

Device ID: FastIronB configured as default VLAN1, tag-type8100
Entry address(es):
  IP address: 192.168.0.13
  IPv6 address (Global): c:a:f:e:c:a:f:e
Platform: FastIron Router,  Capabilities: Router
Interface: Eth 1/2/9
Port ID (outgoing port): Eth 1/2/9 is TAGGED in following VLAN(s):
 9 10 11
Holdtime : 176 seconds
Version :
Foundry, Inc. Router, IronWare Version 07.6.01b1T53 Compiled on Aug 29
2002 at 10:35:21 labeled as B2R07601b1
  3. To display detailed FDP entry information for a specific RUCKUS neighbor device, enter the following command: 
    device# show fdp entry ICX7450-48 Switch

Device ID: ICX7450-48 Switch
configured as tag-type8100
Entry address(es):
IP address: 11.1.1.1
Platform: ICX7450-48 Switch,  Capabilities: Switch
Interface: ethernet1/1/41
Port ID (outgoing port): ethernet2/1/31 is dual-mode with default traffic vlan 66 in following VLAN(s):
22 33 66 78 111
Holdtime : 142 seconds
Ruckus Wireless, Inc. ICX7450-48, IronWare Version 09.0.00_b53T211 
Compiled on Jan 12 2021 at 17:23:54 labeled as SPS09000_b53
  4. To display FDP information for a specific Ethernet interface, enter the following: 
    device# show fdp interface ethernet 1/2/3

FastEthernet1/2/3 is up, line protocol is up
  Encapsulation ethernet
  Sending FDP packets every 5 seconds
  Holdtime is 180 seconds
    This example shows information for a specific Ethernet interface indicating how often the port sends FDP updates and how long neighbors that receive the updates, can hold them before discarding them.
  5. To display FDP and CDP packet statistics, enter the following command: 
    device# show fdp traffic

CDP/FDP counters:
  Total packets output: 6, Input: 5
  Hdr syntax: 0, Chksum error: 0, Encaps failed: 0
  No memory: 0, Invalid packet: 0, Fragmented: 0
  Internal errors: 0
Parent topic: Foundry Discovery Protocol