- LLDP (Link Layer Discovery Protocol 802.1AB)
Default LLDP Configuration
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Feature Default Setting
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LLDP global state Disabled
LLDP timer (packet update frequency) 30 Seconds
LLDP holdtimer (before discarding) 120 Seconds
LLDP reinitialization delay 2 Seconds
LLDP Multicast destination address 01:80:C2:00:00:0E
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Link captured file: Here
Switch(config)#lldp ?
holdtime Specify the holdtime (in sec) to be sent in packets
reinit Delay (in sec) for LLDP initialization on any interface
run Enable LLDP
timer Specify the rate at which LLDP packets are sent (in sec)
tlv-select Selection of LLDP TLVs to send
! Enable LLDP Global.
Switch(config)#lldp run
! Check LLDP per interfaces
SW8#show lldp interface fastEthernet 1/0/22
FastEthernet1/0/22:
Tx: enabled
Rx: enabled
Tx state: INIT
Rx state: WAIT PORT OPER
SW8#show lldp interface fastEthernet 1/0/23
FastEthernet1/0/23:
Tx: enabled
Rx: enabled
Tx state: IDLE
Rx state: WAIT FOR FRAME
! Enable/Disable LLDP per Interface
SW7(config)#interface fastEthernet 0/1
SW7(config-if)#no lldp ?
med-tlv-select Selection of LLDP MED TLVs to send
receive Enable LLDP reception on interface
tlv-select Selection of LLDP TLVs to send
transmit Enable LLDP transmission on interface
SW7(config-if)#no lldp transmit
SW7(config-if)#no lldp receive
SW7#show lldp interface fastEthernet 0/1
FastEthernet0/1:
Tx: disabled
Rx: disabled
Tx state: INIT
Rx state: WAIT PORT OPER
SW8#show lldp
Global LLDP Information:
Status: ACTIVE
LLDP advertisements are sent every 30 seconds
LLDP hold time advertised is 120 seconds
LLDP interface reinitialisation delay is 2 seconds
SW8#show lldp neighbors
Capability codes:
(R) Router, (B) Bridge, (T) Telephone, (C) DOCSIS Cable Device
(W) WLAN Access Point, (P) Repeater, (S) Station, (O) Other
Device ID Local Intf Hold-time Capability Port ID
SW7 Fa1/0/23 120 B Fa0/23
Total entries displayed: 1
SW7#show lldp neighbors detail
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Chassis id: 000f.f72c.c600
Port id: Fa1/0/23
Port Description: FastEthernet1/0/23
System Name: SW8
System Description:
Cisco IOS Software, C3750 Software (C3750-IPSERVICESK9-M), Version 12.2(55)SE5, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2012 by Cisco Systems, Inc.
Compiled Thu 09-Feb-12 18:59 by prod_rel_team
Time remaining: 112 seconds
System Capabilities: B,R
Enabled Capabilities: B
Management Addresses - not advertised
Auto Negotiation - supported, enabled
Physical media capabilities:
100base-TX(FD)
100base-TX(HD)
10base-T(FD)
10base-T(HD)
Media Attachment Unit type: 16
Vlan ID: 1
Total entries displayed: 1
SW8#show lldp traffic
LLDP traffic statistics:
Total frames out: 24
Total entries aged: 0
Total frames in: 1
Total frames received in error: 0
Total frames discarded: 0
Total TLVs discarded: 0
Total TLVs unrecognized: 0
SW8#show lldp errors
LLDP errors/overflows:
Total memory allocation failures: 0
Total encapsulation failures: 0
Total input queue overflows: 0
Total table overflows: 0
! Change LLDP Timers
SW7(config)#lldp timer 10
SW7(config)#lldp holdtime 30
SW7(config)#lldp reinit 5
! Check only SW8 entry
SW7#show lldp entry SW8
