36 ContentsConfiguring L2 and L3 Relay Features (Web) . . . . . 906DHCP Relay Global Configuration. . . . . . . . . 906DHCP Relay Interface Configuration . . . . . . . 907DHCP Relay Interface Statistics . . . . . . . . . 909DHCP Relay VLAN Configuration . . . . . . . . . 910DHCP Relay Agent Configuration . . . . . . . . . 911IP Helper Global Configuration . . . . . . . . . . 912IP Helper Interface Configuration . . . . . . . . 914IP Helper Statistics . . . . . . . . . . . . . . . . 916Configuring L2 and L3 Relay Features (CLI) . . . . . . 917Configuring L2 DHCP Relay . . . . . . . . . . . . 917Configuring L3 Relay (IP Helper) Settings . . . . 919Relay Agent Configuration Example . . . . . . . . . . 92134 Configuring OSPF and OSPFv3 . . . . . . . . 923OSPF Overview . . . . . . . . . . . . . . . . . . . . . 924What Are OSPF Areas and Other OSPFTopology Features? . . . . . . . . . . . . . . . . 924What Are OSPF Routers and LSAs? . . . . . . . 925How Are Routes Selected? . . . . . . . . . . . . 925How Are OSPF and OSPFv3 Different? . . . . . . 925Default OSPF Values . . . . . . . . . . . . . . . . . . 926Configuring OSPF Features (Web) . . . . . . . . . . . 928OSPF Configuration . . . . . . . . . . . . . . . . 928OSPF Area Configuration . . . . . . . . . . . . . 930OSPF Stub Area Summary . . . . . . . . . . . . 933OSPF Area Range Configuration . . . . . . . . . 934OSPF Interface Statistics . . . . . . . . . . . . . 935OSPF Interface Configuration. . . . . . . . . . . 936OSPF Neighbor Table . . . . . . . . . . . . . . . 937
