Users Guide

Table Of Contents
Contents 37
33 Layer-2 and Layer-3 Relay Features . . 1191
L2 and L3 Relay Overview . . . . . . . . . . . . . . . 1191
What Is L2 DHCP Relay?
. . . . . . . . . . . . . 1191
What Is L3 DHCP Relay?
. . . . . . . . . . . . . 1195
What Is the IP Helper Feature?
. . . . . . . . . . 1196
Default L2/L3 Relay Values
. . . . . . . . . . . . . . 1200
Configuring L2 and L3 Relay Features (Web)
. . . . . 1201
L2 DHCP Relay Global Configuration
. . . . . . . 1201
L2 DHCP Relay Interface Configuration
. . . . . 1202
L2 DHCP Relay Interface Statistics
. . . . . . . . 1204
L2 DHCP Relay VLAN Configuration
. . . . . . . 1205
DHCP Relay Agent Configuration
. . . . . . . . . 1205
IP Helper (L3 DHCP Relay) Global Configuration
. 1207
IP Helper (L3 DHCP Relay) Interface Configuration
1209
IP Helper Statistics
. . . . . . . . . . . . . . . . 1211
Configuring L2 and L3 Relay Features (CLI)
. . . . . . 1212
Configuring L2 DHCP Relay
. . . . . . . . . . . . 1212
Configuring L3 Relay (IP Helper) Settings
. . . . 1214
Relay Agent Configuration Example
. . . . . . . . . . 1216
34 OSPF and OSPFv3 . . . . . . . . . . . . . . . . 1219
OSPF Overview . . . . . . . . . . . . . . . . . . . . 1220
What Are OSPF Areas and Other OSPF
Topology Features?
. . . . . . . . . . . . . . . . 1220
What Are OSPF Routers and LSAs?
. . . . . . . 1221
How Are Routes Selected?
. . . . . . . . . . . . 1221
How Are OSPF and OSPFv3 Different?
. . . . . . 1221
OSPF Feature Details
. . . . . . . . . . . . . . . . . 1222