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Configuring for Network Management Applications
LLDP (Link-Layer Discovery Protocol)
Note Because ProCurve switches do not generate CDP packets, they are not
represented in the CDP data collected by any neighbor devices running CDP.
A switch with CDP disabled forwards the CDP packets it receives from other
devices, but does not store the CDP information from these packets in its own
MIB.
LLDP data transmission/collection and CDP data collection are both enabled
in the switch’s default configuration. In this state, an SNMP network
management application designed to discover devices running either CDP or
LLDP can retrieve neighbor information from the switch regardless of whether
LLDP or CDP is used to collect the device-specific information.
Protocol State Packet
Generation
Inbound Data Management Inbound Packet Forwarding
CDP Enabled
1
n/a Store inbound CDP data. No forwarding of inbound
CDP packets.
CDP Disabled n/a No storage of CDP data from
neighbor devices.
Floods inbound CDP packets
from connected devices to
outbound ports.
LLDP Enabled
1
Generates and
transmits
LLDP packets
out all ports on
the switch.
Store inbound LLDP data. No forwarding of inbound
LLDP packets.
LLDP Disabled No packet
generation.
No storage of LLDP data
from neighbor devices.
No forwarding of inbound
LLDP packets.
1
Both CDP data collection and LLDP transmit/receive are enabled in the default configuration.
If a switch receives CDP packets and LLDP packets from the same neighbor device on the
same port, it stores and displays the two types of information separately if the chassis and
port ID information in the two types of advertisements is different. In this case, if you want
to use only one type of data from a neighbor sending both types, disable the unwanted
protocol on either the neighbor device or on the switch. However, if the chassis and port ID
information in the two types of advertisements is the same, the LLDP information overwrites
the CDP data for the same neighbor device on the same port.