HP 5300 Informacje Techniczne Pobierz pdf (Strona 290)

Configuring for Network Management Applications

CDP

General CDP Operation

The switch stores information about adjacent CDP devices in a CDP Neigh

bors Table maintained in the switch’s MIB (Management Information Base).

These data are available to SNMP-based applications designed to read CDP

data from the MIB. For example:

Switch "A"

with CDP Running

• The Neighbors Table in switches "A", "B", and "D"

contain information on switch "C" only because

it is the only neighbor for these switches.

• The Neighbors Table in switch "C" contains

information on switches "A", "B", and "D"

because all of these switches are neighbors of

switch "C".

Note: A given switch’s CDP Neighbors Table

includes data only on neighbor CDP devices, but

not on that switch itself.

CDP Neighbors Table

Switch "C" data

Switch "B"

with CDP Running

CDP Neighbors Table

Switch "C" data

Switch "C"

with CDP Running

CDP Neighbors Table

Switch "A" data

Switch "B" data

Switch "D" data

Switch "D"

with CDP Running

CDP Neighbors Table

Switch "C" data

Figure 14-10. Example of How the Switch Stores Data on Neighbor CDP Devices

Outgoing Packets

A Series 5300XL Switch running CDP periodically transmits a one-hop CDP

packet out each of its ports. This packet contains data describing the switch

and, if the one-hop destination is another device running CDP, the receiving

device stores the sending device’s data in a CDP Neighbors Table. The

receiving device also transmits a similar one-hop CDP packet out each of its

ports to make itself known to other CDP devices to which it is connected.

Thus, each CDP device in the network provides data on itself to the CDP

Neighbors to which it is directly connected. However, there are instances

where a packet is forwarded beyond the immediate neighbor, or simply

dropped.

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