Configuring Lldp - Cisco Small Business 200 Series Administration Manual

Administration: Discovery

Configuring LLDP

NOTE
The operation of CDP/LLDP is independent of the STP status of an interface.
If 802.1x port access control is enabled at an interface, the device transmits and receives CDP/LLDP
packets to and from the interface only if the interface is authenticated and authorized.
If a port is the target of mirroring, then CDP/LLDP considers it down.
NOTE
Configuring LLDP
This section describes how to configure LLDP. It covers the following topics:
• LLDP Overview
• LLDP Properties
• LLDP Port Settings
• LLDP MED Network Policy
• LLDP MED Port Settings
• LLDP Port Status
• LLDP Local Information
• LLDP Neighbor Information
• LLDP Statistics
• LLDP Overloading
Cisco Small Business 200 Series Smart Switch Administration Guide
CDP/LLDP does not distinguish if a port is in a LAG. If there are multiple ports in a
LAG, CDP/LLDP transmit packets on each port without taking into account the fact
that the ports are in a LAG.
CDP and LLDP are link layer protocols for directly-connected CDP/LLDP capable
devices to advertise themselves and their capabilities. In deployments where the
CDP/LLDP-capable devices are not directly connected and are separated with
CDP/LLDP-incapable devices, the CDP/LLDP-capable devices may be able to
receive the advertisement from other device(s) only if the CDP/LLDP-incapable
devices flood the CDP/LLDP packets they receive. If the CDP/LLDP-incapable
devices perform VLAN-aware flooding, then CDP/LLDP-capable devices can hear
each other only if they are in the same VLAN. A CDP/LLDP-capable device may
receive advertisements from more than one device if the CDP/LLDP-incapable
devices flood the CDP/LLDP packets.
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