Configuring LLDP

This chapter contains the following sections:

Configuring LLDP

Before You Begin

Ensure that the Link Layer Discovery Protocol (LLDP) feature is enabled on the switch.

SUMMARY STEPS

    1.    switch# configure terminal

    2.    switch(config)# lldp {holdtime seconds | reinit seconds | timer seconds | tlv-select {dcbxp | management-address | port-description | port-vlan | system-capabilities | system-description | system-name}}

    3.    switch(config)# no lldp {holdtime | reinit | timer}

    4.    (Optional)switch# show lldp


DETAILED STEPS
     Command or ActionPurpose
    Step 1switch# configure terminal  

    Enters global configuration mode.

     
    Step 2 switch(config)# lldp {holdtime seconds | reinit seconds | timer seconds | tlv-select {dcbxp | management-address | port-description | port-vlan | system-capabilities | system-description | system-name}}
     

    Configures LLDP options.

    Use the holdtime option to set the length of time (10 to 255 seconds) that a device should save LLDP information received before discarding it. The default value is 120 seconds.

    Use the reinit option to set the length of time (1 to 10 seconds) to wait before performing LLDP initialization on any interface. The default value is 2 seconds.

    Use the timer option to set the rate (5 to 254 seconds) at which LLDP packets are sent. The default value is 30 seconds.

    Use the tlv-select option to specify the type length value (TLV). The default is enabled to send and receive all TLVs.

    Use the dcbxp option to specify the Data Center Ethernet Parameter Exchange (DCBXP) TLV messages.

    Use the management-address option to specify the management address TLV messages.

    Use the port-description option to specify the port description TLV messages.

    Use the port-vlan option to specify the port VLAN ID TLV messages.

    Use the system-capabilities option to specify the system capabilities TLV messages.

    Use the system-description option to specify the system description TLV messages.

    Use the system-name option to specify the system name TLV messages.

     
    Step 3 switch(config)# no lldp {holdtime | reinit | timer}
     

    Resets the LLDP values to their defaults.

     
    Step 4(Optional)switch# show lldp  

    Displays LLDP configurations.

     

    This example shows how to configure the global LLDP hold time to 200 seconds: 

    switch# configure terminal
switch(config)# lldp holdtime 200
switch(config)#

    This example shows how to enable LLDP to send or receive the management address TLVs: 

    switch# configure terminal
switch(config)# lldp tlv-select management-address
switch(config)#

    Configuring Interface LLDP

    SUMMARY STEPS

      1.    switch# configure terminal

      2.    switch(config)# interface type slot/port

      3.    switch(config-if)# [no] lldp {receive | transmit}

      4.    (Optional) switch# show lldp {interface | neighbors [detail | interface | system-detail] | timers | traffic}


    DETAILED STEPS
       Command or ActionPurpose
      Step 1switch# configure terminal  

      Enters global configuration mode.

       
      Step 2 switch(config)# interface type slot/port
       

      Selects the interface to change.

       
      Step 3 switch(config-if)# [no] lldp {receive | transmit}
       

      Sets the selected interface to either receive or transmit.

      The no form of the command disables the LLDP transmit or receive.

       
      Step 4switch# show lldp {interface | neighbors [detail | interface | system-detail] | timers | traffic}
              		(Optional)

      Displays LLDP configurations.

       

      This example shows how to set an interface to transmit LLDP packets: 

      switch# configure terminal
      switch(config)# interface ethernet 1/2
      switch(config-if)# lldp transmit

      This example shows how to configure an interface to disable LLDP: 

      switch# configure terminal
      switch(config)# interface ethernet 1/2
      switch(config-if)# no lldp transmit
      switch(config-if)# no lldp receive

      This example shows how to display LLDP interface information: 

      switch# show lldp interface ethernet 1/2
      tx_enabled: TRUE
      rx_enabled: TRUE
      dcbx_enabled: TRUE
      Port MAC address:    00:0d:ec:a3:5f:48
      Remote Peers Information
      No remote peers exist

      This example shows how to display LLDP neighbor information: 

      switch# show lldp neighbors
LLDP Neighbors
Remote Peers Information on interface Eth1/40
Remote peer's MSAP: length 12 Bytes:
00    c0    dd    0e    5f    3a    00    c0    dd    0e    5f    3a
LLDP TLV's
LLDP TLV type:Chassis ID  LLDP TLV Length: 7
LLDP TLV type:Port ID  LLDP TLV Length: 7
LLDP TLV type:Time to Live  LLDP TLV Length: 2
LLDP TLV type:LLDP Organizationally Specific  LLDP TLV Length: 55
LLDP TLV type:LLDP Organizationally Specific  LLDP TLV Length: 5
LLDP TLV type:END of LLDPDU  LLDP TLV Length: 0
Remote Peers Information on interface Eth1/34
Remote peer's MSAP: length 12 Bytes:
00    0d    ec    a3    27    40    00    0d    ec    a3    27    69
LLDP TLV's
LLDP TLV type:Chassis ID  LLDP TLV Length: 7
LLDP TLV type:Port ID  LLDP TLV Length: 7
LLDP TLV type:Time to Live  LLDP TLV Length: 2
LLDP TLV type:LLDP Organizationally Specific  LLDP TLV Length: 55
LLDP TLV type:LLDP Organizationally Specific  LLDP TLV Length: 5
LLDP TLV type:END of LLDPDU  LLDP TLV Length: 0
Remote Peers Information on interface Eth1/33
Remote peer's MSAP: length 12 Bytes:
00    0d    ec    a3    27    40    00    0d    ec    a3    27    68
LLDP TLV's
LLDP TLV type:Chassis ID  LLDP TLV Length: 7
LLDP TLV type:Port ID  LLDP TLV Length: 7
LLDP TLV type:Time to Live  LLDP TLV Length: 2
LLDP TLV type:LLDP Organizationally Specific  LLDP TLV Length: 55
LLDP TLV type:LLDP Organizationally Specific  LLDP TLV Length: 5
LLDP TLV type:END of LLDPDU  LLDP TLV Length: 0

      This example shows how to display the system details about LLDP neighbors: 

      switch# sh lldp neighbors system-detail
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	Chassis ID	PortID	Hold-time	Capability

switch-2		Eth1/7		0005.73b7.37ce	Eth1/7		120	B
switch-3		Eth/9			0005.73b7.37d0	Eth1/9		120	B
switch-4		Eth1/10	0005.73b7.37d1	Eth1/10	120	B
Total entries displayed: 3

      This example shows how to display LLDP timer information: 

      switch# show lldp timers
      LLDP Timers
      holdtime 120 seconds
      reinit 2 seconds
      msg_tx_interval 30 seconds

      This example shows how to display information about LLDP counters: 

      switch# show lldp traffic
      LLDP traffic statistics:
       
          Total frames out: 8464
          Total Entries aged: 6
          Total frames in: 6342
          Total frames received in error: 2
          Total frames discarded: 2
          Total TLVs unrecognized: 0