Cisco SX350 Series Administration Manual page 158

Administration: Discovery
LLDP and CDP
NOTE
NOTE
Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x
• Auto Smartport requires CDP and/or LLDP to be enabled. Auto Smartport
automatically configures an interface based on the CDP/LLDP advertisement received
from the interface.
• CDP and LLDP end devices, such as IP phones, learn the voice VLAN configuration
from CDP and LLDP advertisements. By default, the device is enabled to send out
CDP and LLDP advertisement based on the voice VLAN configured at the device.
Refer to the Voice VLAN
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.
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.
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.
for details.
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