HP ProCurve 6400cl Series Management And Configuration Manual page 329

N o t e
Because the Series 3400cl and Series 6400cl switches do not generate CDP
packets, these switches do not appear in the CDP data collected by any
neighbor devices running CDP.
A Series 3400cl or 6400cl 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 manage­
ment 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
1
CDP Enabled n/a
CDP Disabled n/a
1
LLDP Enabled Generates and Store inbound LLDP data.
transmits
LLDP packets
out all ports on
the switch.
LLDP Disabled No packet
generation.
1
Both CDP data collection and LLDP transmit/receive are enabled in the default configuration
of 3400cl and 6400cl switches. If one of these switches 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 3400cl or 6400cl 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. For an example of LLDP and CDP advertisements
resulting in a double entry, refer to figure "Example of a Connection to a Device Transmitting
Both LLDP and CDP Advertisements" on page 14-47.
Configuring for Network Management Applications
LLDP (Link-Layer Discovery Protocol)
Inbound Data Management Inbound Packet Forwarding
Store inbound CDP data.
No storage of CDP data from Floods inbound CDP packets
neighbor devices.
No storage of LLDP data
from neighbor devices.
No forwarding of inbound
CDP packets.
from connected devices to
outbound ports.
No forwarding of inbound
LLDP packets.
No forwarding of inbound
LLDP packets.
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