........................................................................................................................................................................................1146

11.3.5 Checking the Configurations...............................................................................................................................1147

11.4 Configuring Multi-Device Backup of BRAS User Information............................................................................1148

11.4.1 Before You Start..................................................................................................................................................1149

11.4.2 (Optional) Disabling RUI Backup for Users Getting Online from a Specified Domain.....................................1149

11.4.3 Setting NAS Parameters......................................................................................................................................1150

11.4.4 (Optional) Setting the Interval for Backing Up Traffic or the Traffic Threshold...............................................1151

11.4.5 Configuring User Information Backup in Exclusive IP Address Pool Mode......................................................1151

11.4.6 Configuring User Information Backup in Shared IP Address Pool Mode..........................................................1152

11.4.7 Configuring an Address Pool on a Device Configured with a Shared Address Pool..........................................1154

11.4.8 Binding the Remote Backup Profile to the User Access Interface......................................................................1156

11.4.9 Controlling Advertisement of Address Pool UNRs............................................................................................1157

11.4.10 Checking the Configuration...............................................................................................................................1158

11.5 Configuring Multi-Device Backup for IPv6 BRAS User Information...................................................................1160

11.5.1 Before You Start..................................................................................................................................................1161

11.5.2 (Optional) Disabling RUI Backup for Users Getting Online from a Specified Domain.....................................1162

11.5.3 Setting NAS Parameters......................................................................................................................................1163

11.5.4 Setting the Interval for Backing Up Traffic or the Traffic Threshold.................................................................1163

11.5.5 Configuring User Information Backup in Shared IP Address Pool Mode..........................................................1164

11.5.6 (Optional) Configuring IP Addresses for Web Authentication and RADIUS Authorization Servers................1167

11.5.7 Binding the Remote Backup Profile to the User Access Interface......................................................................1169

11.5.8 Checking the Configuration.................................................................................................................................1169

11.6 Configuring Multicast Two-node Hot Backup.......................................................................................................1171

11.6.1 Before You Start..................................................................................................................................................1172

11.6.2 Enabling a Multicast RBS...................................................................................................................................1173

11.6.3 (Optional) Enabling IGMP Message Duplication...............................................................................................1174

11.6.4 Checking the Configurations...............................................................................................................................1175

11.7 Configuring L2TP Two-node Hot Backup.............................................................................................................1176

11.7.1 Before You Start..................................................................................................................................................1176

11.7.2 (Optional) Setting a Base Value for L2TP Tunnel IDs.......................................................................................1179

11.7.3 Configuring an L2TP Tunnel..............................................................................................................................1179

11.7.4 Enabling an L2TP RBS.......................................................................................................................................1180

11.7.5 Controlling Advertisement of L2TP Hot Backup Routes...................................................................................1180

11.7.6 (Optional) Setting the maximum number of users allowed on an L2TP LAC....................................................1181

11.7.7 (Optional) Disabling the L2TP Traffic Protection Mechanism...........................................................................1182

11.7.8 (Optional) Configuring a Domain Mapping List.................................................................................................1182

11.7.9 Checking the Configurations...............................................................................................................................1183

11.8 Configuring Dual-System Backup for Distributed NAT Services.........................................................................1185

11.8.1 Before You Start..................................................................................................................................................1186

11.8.2 Configuring Basic Distributed NAT Functions...................................................................................................1187

11.8.3 Configuring Association Between NAT and BRAS Service Backup.................................................................1187

Issue 02 (2014-09-30)

Huawei Proprietary and Confidential

xiv

Table of Contents