This section contains information related to the Link Layer Discovery
Protocol (LLDP) features on the Cisco Nexus 3550-F Fusion (formerly ExaLINK Fusion). Nexus 3550-Fs purchased as layer 1
only devices (i.e. those which do not have an FPGA module installed) are not
capable of receiving or transmitting LLDP information, nor are Nexus 3550-Fs running
Displaying LLDP neighbors
LLDP messages will always be received on LLDP capable ports, and the
show lldp neighbors command can be invoked at any time to see what entries
are in the Nexus 3550-F's database, for example:
admin@@EXALINK-FUSION> show lldp neighbors Local Port Chassis ID Port ID System Name ---------- ----------------- ----------------- -------------------- B1 F4:6D:04:8D:F6:41 64:3F:5F:01:14:A0 MyNetworkDevice B2 F4:6D:04:8D:F6:41 64:3F:5F:01:14:A1 MyNetworkDevice B3 F4:6D:04:8D:F6:41 64:3F:5F:01:14:A2 MyNetworkDevice B4 F4:6D:04:8D:F6:41 64:3F:5F:01:14:A3 MyNetworkDevice
Additional information can be shown by issuing the same command from within the port modal state, for example:
admin@N3550-F> port B1 admin@N3550-F(port:B1)> show lldp neighbors Port : B1 Chassis ID type : MAC address Chassis ID : F4:6D:04:8D:F6:41 Port ID type : MAC address Port ID : 64:3F:5F:01:14:A0 System name : MyNetworkDevice System description : An LLDP enabled device on my network Management address : 22.214.171.124 Interface number type : Unknown
The broadcast of LLDP frames which would allow remote parties to detect the identity of the Nexus 3550-F is configurable on a port-by-port basis, allowing for less congestion on ports that do not require LLDP. Enabling of LLDP transmit must be invoked through the config mode for a specific port:
admin@N3550-F> config port B1 admin@N3550-F(config-port:B1)> lldp transmit Port B1 LLDP transmit enabled
As long as the specified port forms part of a mux or switch object, it will transmit LLDP frames periodically out that port. Note that this configuration can be done when a port is not a part of an object, however transmission of LLDP frames will not begin until the port is part of a mux or switch object.
Note also that if a mux object is in
raw mode, ie where the traffic path from
the upstream port to the downstream ports is broadcast via layer 1 only, it's not
possible for LLDP transmits to go out a downstream port.
Transmission of LLDP frames can be disabled with the
no lldp transmit command:
admin@N3550-F> config port B1 admin@N3550-F(config-port:B1)> no lldp transmit Port B1 LLDP transmit disabled
This page was last updated on Feb-19-2021.