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# VPP Link Layer Discovery Protocol (LLDP) implementation {#lldp_doc}
This is a memo intended to contain documentation of the VPP LLDP implementation
Everything that is not directly obvious should come here.
## LLDP
LLDP is a link layer protocol to advertise the capabilities and current status of the system.
There are 2 nodes handling LLDP
1.) input-node which processes incoming packets and updates the local database
2.) process-node which is responsible for sending out LLDP packets from VPP side
### Configuration
LLDP has a global configuration and a per-interface enable setting.
Global configuration is modified using the "set lldp" command
set lldp [system-name <string>] [tx-hold <value>] [tx-interval <value>]
system-name: the name of the VPP system sent to peers in the system-name TLV
tx-hold: multiplier for tx-interval when setting time-to-live (TTL) value in the LLDP packets (TTL = tx-hold * tx-interval + 1, if TTL > 65535, then TTL = 65535)
tx-interval: time interval between sending out LLDP packets
Per interface setting is done using the "set interface lldp" command
set interface lldp <interface> | if_index <idx> [port-desc <string>] [disable]
interface: the name of the interface for which to enable/disable LLDP
if_index: sw interface index can be used if interface name is not used.
port-desc: port description
disable: LLDP feature can be enabled or disabled per interface.
### Configuration example
Configure system-name as "VPP" and transmit interval to 10 seconds:
set lldp system-name VPP tx-interval 10
Enable LLDP on interface TenGigabitEthernet5/0/1 with port description
set interface lldp TenGigabitEthernet5/0/1 port-desc vtf:eth0
### Operational data
The list of LLDP-enabled interfaces which are up can be shown using "show lldp" command
Example:
DBGvpp# show lldp
Local interface Peer chassis ID Remote port ID Last heard Last sent Status
GigabitEthernet2/0/1 never 27.0s ago inactive
TenGigabitEthernet5/0/1 8c:60:4f:dd:ca:52 Eth1/3/3 20.1s ago 18.3s ago active
All LLDP configuration data with all LLDP-enabled interfaces can be shown using "show lldp detail" command
Example:
DBGvpp# show lldp detail
LLDP configuration:
Configured system name: vpp
Configured tx-hold: 4
Configured tx-interval: 30
LLDP-enabled interface table:
Interface name: GigabitEthernet2/0/1
Interface/peer state: inactive(timeout)
Last known peer chassis ID:
Last known peer port ID:
Last packet sent: 12.4s ago
Last packet received: never
Interface name: GigabitEthernet2/0/2
Interface/peer state: interface down
Last packet sent: never
Interface name: TenGigabitEthernet5/0/1
Interface/peer state: active
Peer chassis ID: 8c:60:4f:dd:ca:52(MAC address)
Remote port ID: Eth1/3/3(Locally assigned)
Last packet sent: 3.6s ago
Last packet received: 5.5s ago
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