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+LLDP Protocol
+=============
+
+This is a memo intended to contain documentation of the VPP LLDP (Link
+Layer Discovery Protocol) 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 ] [tx-hold ] [tx-interval ]
+
+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 \| if_index [port-desc ] [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