ProCurve Series 2300 and 2500 Switches Release Notes

185

Enhancements in Release F.02.02

CDP

CDP Features

Introduction

In the Series 2500 switches, CDP-v1 (Cisco Discovery Protocol, version 1) provides data that aids

SNMP-based network mapping utilities designed to discover devices running CDP in a network. To

make this data available, the switch transmits information about itself via CDP packets to adjacent

devices, and also receives and stores information about adjacent devices running CDP. This enables

each CDP device to receive and maintain identity data on each of its CDP neighbors and pass this

information off to an SNMP utility designed to query the CDP area of the device’s MIB.

Note

To take advantage of CDP in the Series 2500 switches, you should have a working knowledge of SNMP

operation and an SNMP utility capable of polling the switches for CDP data. HP’s implementation of

CDP places specific data into the switch’s Management Information Base (MIB). However, retrieval

of this data for network mapping is dependent on the operation of your SNMP utility. Refer to the

documentation provided with the utility.

An SNMP utility can progressively discover CDP devices in a network by:

1. Reading a given device’s CDP Neighbor table (in the Management Information Base, or MIB) to

learn about other, neighbor CDP devices

2. Using the information learned in step 1 to go to and read the neighbor devices’ CDP Neighbors

tables to learn about additional CDP devices, and so on

Feature Default Menu CLI Web

view the switch’s CDP configuration n/a — page 190 —

view the switch’s CDP Neighbors table n/a — page 191 —

clear (reset) the CDP Neighbors table n/a — page 192 —

enable or disable CDP on the switch enabled — page 193 —

enable or disable CDP operation on an individual port enabled — page 194 —

change the transmit interval for the switch’s CDP packets 60 seconds — page 194 —

change the hold time (time-to-live for CDP packets the switch

generates)

180 seconds — page 195 —