Contents

 

Configuring Flex Links and MAC Address-Table Move Update

21-5

 

Configuration Guidelines

21-5

 

 

 

 

 

 

Default Configuration

21-5

 

 

 

 

 

 

 

Configuring Flex Links and MAC Address-Table Move Update

21-6

 

Configuring Flex Links

21-6

 

 

 

 

 

 

 

Configuring VLAN Load Balancing on Flex Links

21-8

 

 

Configuring the MAC Address-Table Move Update Feature

21-9

 

Monitoring Flex Links and the MAC Address-Table Move Update 21-11

 

Configuring DHCP Features and IP Source Guard

 

 

C H A P T E R 22

22-1

 

 

Understanding DHCP Features

22-1

 

 

 

 

 

 

DHCP Server 22-2

 

 

 

 

 

 

 

 

 

DHCP Relay Agent

22-2

 

 

 

 

 

 

 

 

DHCP Snooping

22-2

 

 

 

 

 

 

 

 

 

Option-82 Data Insertion

 

22-3

 

 

 

 

 

 

Cisco IOS DHCP Server Database

22-6

 

 

 

 

 

DHCP Snooping Binding Database

22-6

 

 

 

 

DHCP Snooping and Switch Stacks

22-8

 

 

 

 

Configuring DHCP Features

22-8

 

 

 

 

 

 

 

Default DHCP Configuration

22-8

 

 

 

 

 

 

DHCP Snooping Configuration Guidelines

22-9

 

 

 

Configuring the DHCP Server

22-10

 

 

 

 

 

DHCP Server and Switch Stacks

22-10

 

 

 

 

 

Configuring the DHCP Relay Agent

22-11

 

 

 

 

Specifying the Packet Forwarding Address

22-11

 

 

Enabling DHCP Snooping and Option 82

22-12

 

 

 

Enabling DHCP Snooping on Private VLANs

22-14

 

 

Enabling the Cisco IOS DHCP Server Database

22-14

 

 

Enabling the DHCP Snooping Binding Database Agent 22-14

 

Displaying DHCP Snooping Information

22-15

 

 

 

 

Understanding IP Source Guard

 

22-16

 

 

 

 

 

 

Source IP Address Filtering

 

22-16

 

 

 

 

 

 

Source IP and MAC Address Filtering

22-17

 

 

 

Configuring IP Source Guard

22-17

 

 

 

 

 

 

Default IP Source Guard Configuration

22-17

 

 

 

IP Source Guard Configuration Guidelines

22-17

 

 

Enabling IP Source Guard

22-18

 

 

 

 

 

 

 

 

Displaying IP Source Guard Information

22-19

 

 

 

 

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

 

 

 

 

 

 

 

 

 

 

 

 

 

 

xx

 

 

OL-9775-02

 

 

 

 

 

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Cisco Systems 3750E manual Dhcp Server