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Inter-AS VPN ·········································································································································· 185

Carrier's carrier ······································································································································ 189

Nested VPN ··········································································································································· 191

HoVPN ··················································································································································· 192

OSPF VPN extension ····························································································································· 194

BGP AS number substitution and SoO attribute ···················································································· 196

MPLS L3VPN FRR ································································································································· 197

Protocols and standards ························································································································ 199

MPLS L3VPN configuration task list ·············································································································· 199

Configuring basic MPLS L3VPN ···················································································································· 200

Configuration prerequisites ···················································································································· 200

Configuring VPN instances ···················································································································· 200

Configuring routing between a PE and a CE ························································································· 202

Configuring routing between PEs ··········································································································· 207

Configuring BGP VPNv4 route control ··································································································· 207

Configuring inter-AS VPN ······························································································································ 209

Configuring inter-AS option A ················································································································· 209

Configuring inter-AS option B ················································································································· 209

Configuring inter-AS option C ················································································································ 210

Configuring nested VPN ································································································································ 213

Configuring HoVPN ········································································································································ 214

Configuring an OSPF sham link ····················································································································· 215

Configuring a loopback interface ············································································································ 215

Redistributing the loopback interface address ······················································································· 216

Creating a sham link ······························································································································ 216

Specifying the VPN label processing mode on the egress PE ······································································ 216

Configuring BGP AS number substitution and SoO attribute ········································································· 217

Configuring MPLS L3VPN FRR ····················································································································· 217

Enabling SNMP notifications for MPLS L3VPN ····························································································· 219

Enabling logging for BGP route flapping ········································································································ 220

Displaying and maintaining MPLS L3VPN ····································································································· 220

MPLS L3VPN configuration examples ··········································································································· 221

Configuring basic MPLS L3VPN ············································································································ 221

Configuring a hub-spoke network ·········································································································· 227

Configuring MPLS L3VPN inter-AS option A ························································································· 233

Configuring MPLS L3VPN inter-AS option B ························································································· 238

Configuring MPLS L3VPN inter-AS option C ························································································· 243

Configuring MPLS L3VPN carrier's carrier in the same AS ··································································· 250

Configuring MPLS L3VPN carrier's carrier in different ASs ··································································· 258

Configuring nested VPN ························································································································· 265

Configuring HoVPN ································································································································ 274

Configuring an OSPF sham link ············································································································· 281

Configuring BGP AS number substitution ······························································································ 286

Configuring BGP AS number substitution and SoO attribute ································································· 289

Configuring MPLS L3VPN FRR through VPNv4 route backup for a VPNv4 route ································ 292

Configuring MPLS L3VPN FRR through VPNv4 route backup for an IPv4 route ·································· 294

Configuring MPLS L3VPN FRR through IPv4 route backup for a VPNv4 route ···································· 296

Configuring IPv6 MPLS L3VPN ·································································· 299

Overview ························································································································································ 299

IPv6 MPLS L3VPN packet forwarding ··································································································· 299

IPv6 MPLS L3VPN routing information advertisement ·········································································· 300

IPv6 MPLS L3VPN network schemes and features ··············································································· 300

Protocols and standards ························································································································ 300

IPv6 MPLS L3VPN configuration task list ······································································································ 301

Configuring basic IPv6 MPLS L3VPN ············································································································ 301

Configuration prerequisites ···················································································································· 301

Configuring VPN instances ···················································································································· 301

Configuring routing between a PE and a CE ························································································· 303

Configuring routing between PEs ··········································································································· 309

Configuring BGP VPNv6 route control ··································································································· 309

Configuring inter-AS IPv6 VPN ······················································································································ 311