Name: Cisco Catalyst 2950
Brand: Cisco
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CHAPTER

19-1

Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide

78-11380-12

Configuring DHCP Features

This chapter describes how to configure DHCP snooping and the option-82 data insertion features on the

Catalyst 2950 or Catalyst 2955 switch.

Note For complete syntax and usage information for the commands used in this chapter, see the command

reference for this release, and see the “IP Addressing and Services” section in the Cisco IOS IP and IP

Routing Command Reference, Release 12.1.

This chapter consists of these sections:

• Understanding DHCP Features, page 19-1

• Configuring DHCP Features, page 19-5

• Displaying DHCP Information, page 19-8

Understanding DHCP Features

DHCP is widely used in LAN environments to dynamically assign host IP addresses from a centralized

server, which significantly reduces the overhead of administration of IP addresses. DHCP also helps

conserve the limited IP address space because IP addresses no longer need to be permanently assigned

to hosts; only those hosts that are connected to the network consume IP addresses.

The switch supports these DHCP features:

• DHCP Server, page 19-2

• DHCP Relay Agent, page 19-2

• DHCP Snooping, page 19-2

• Option-82 Data Insertion, page 19-3

For information about the DHCP client, see the “IP Addressing and Services” section in the Cisco IOS

IP and IP Routing Configuration Guide, Release 12.1.

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General

Forwarding Bandwidth	8.8 Gbps
Switching Capacity	13.6 Gbps
Forwarding Rate	6.6 Mpps
Weight	3.6 kg
RAM	16 MB
Flash Memory	8 MB
Operating Humidity	10% to 85% non-condensing
Uplink Ports	2 x 10/100/1000Base-T
Dimensions	4.4 cm x 44.5 cm x 24.2 cm
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Quality of Service (QoS), VLAN support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.1D, IEEE 802.1Q, IEEE 802.1p
Status Indicators	system
Operating Temperature	0 to 45°C
Ports	24 x 10/100 Ethernet ports
MAC Address Table Size	8, 192 entries
Power Supply	Internal 100-240V AC, 50-60Hz