Nortel Networks WEB OS 212777 - Manual (Page 3)

212777-A, February 2002
3
Contents
Preface 21
Who Should Use This Guide 21
What You’ll Find in This Guide 21
Typographic Conventions 23
Contacting Us 24
Part 1: Basic Switching & Routing
Chapter 1: Basic IP Routing 27
IP Routing Benefits 28
Routing Between IP Subnets 28
Example of Subnet Routing 31
Defining IP Address Ranges for the Local Route Cache 35
Border Gateway Protocol (BGP) 36
Internal Routing Versus External Routing 36
Forming BGP Peer Routers 37
BGP Failover Configuration 37
DHCP Relay 41
DHCP Overview 41
DHCP Relay Agent Configuration 42
Chapter 2: VLANs 43
VLAN ID Numbers 44
VLAN Tagging 44
VLANs and the IP Interfaces 45
VLAN Topologies and Design Issues 45
Example 1: Multiple VLANS with Tagging Adapters 46
Example 2: Parallel Links with VLANs 48