65
2.
Select a port and click
Edit
. Enter the fields as described above.
3.
Click
Apply
. The PoE settings for the port are written to the Running Configuration file.
Discovery - LLDP
Link Layer Discovery Protocol (LLDP) is a link layer protocol for directly-connected LLDP-capable
neighbors to advertise themselves and their capabilities. LLDP enables network managers to
troubleshoot and enhance network management in multi-vendor environments. LLDP
standardizes methods for network devices to advertise themselves to other systems, and to store
discovered information.
By default, the device sends an LLDP advertisement periodically to all its interfaces and
processes incoming LLDP packets as required by the protocols. In LLDP, advertisements are
encoded as TLV (Type, Length, Value) in the packet.
The information learned is stored in the data in a Management Information Base (MIB). The
network management system models the topology of the network by querying these MIB
databases.
By default, the device terminates and processes all incoming LLDP packets as required by the
protocol.
The LLDP protocol has an extension called LLDP Media Endpoint Discovery (LLDP-MED) that
provides and accepts information from media endpoint devices such as VoIP phones and video
phones.
Some notes about LLDP configuration:
•
LLDP can be enabled or disabled globally or per port. The LLDP capability of a port is
relevant only if LLDP is globally enabled.
•
If LLDP is globally enabled, the device filters out incoming LLDP packets from ports that
are LLDP-disabled.
•
If LLDP is globally disabled, the device can be configured to discard, VLAN- aware
flooding, or VLAN-unaware flooding of all incoming LLDP packets. VLAN-aware flooding
floods an incoming LLDP packet to the VLAN where the packet is received excluding the
ingress port. VLAN-unaware flooding floods an incoming LLDP packet to all the ports
excluding the ingress port. The default is to discard LLDP packets when LLDP is globally
disabled. You can configure the discard/flooding of incoming LLDP packets from the LLDP
Feature Configuration page.
•
LLDP end devices, such as IP phones, learn the voice VLAN configuration from LLDP
advertisements. By default, the device is enabled to send out LLDP advertisement based
on the voice VLAN configured at the device. Refer to the Voice VLAN for details.
Note
—LLDP does not distinguish if a port is in a LAG. If there are multiple ports in a LAG, LLDP
transmit packets on each port without taking into account the fact that the ports are in a LAG.