Configuring MPLS L3VPN ······································································································································· 166

Overview ······································································································································································· 166

Basic MPLS L3VPN architecture ························································································································· 166

MPLS L3VPN concepts ········································································································································ 167

MPLS L3VPN route advertisement ······················································································································ 168

MPLS L3VPN packet forwarding ························································································································ 169

MPLS L3VPN networking schemes ····················································································································· 170

Inter-AS VPN ························································································································································ 172

Carrier's carrier ··················································································································································· 176

Nested VPN ························································································································································· 178

HoVPN ·································································································································································· 179

OSPF VPN extension ··········································································································································· 181

BGP AS number substitution and SoO attribute ······························································································· 183

MPLS L3VPN FRR ················································································································································· 184

Multi-VPN instance CE ········································································································································ 186

Protocols and standards ····································································································································· 187

MPLS L3VPN configuration task list ···························································································································· 188

Configuring basic MPLS L3VPN ································································································································· 188

Configuration prerequisites ································································································································ 188

Configuring VPN instances ································································································································ 188

Configuring routing between a PE and a CE ··································································································· 190

Configuring routing between PEs ······················································································································ 196

Configuring BGP VPNv4 route control ············································································································· 196

Configuring inter-AS VPN ··········································································································································· 198

Configuring inter-AS option A ···························································································································· 198

Configuring inter-AS option B ···························································································································· 199

Configuring inter-AS option C···························································································································· 200

Configuring nested VPN ·············································································································································· 203

Configuring HoVPN ····················································································································································· 204

Configuring an OSPF sham link ································································································································· 205

Configuring a loopback interface ····················································································································· 205

Redistributing the loopback interface route ······································································································ 206

Creating a sham link ··········································································································································· 206

Configuring routing on an MCE ································································································································· 206

Configuring routing between an MCE and a VPN site ··················································································· 207

Configuring routing between an MCE and a PE ····························································································· 212

Specifying the VPN label processing mode on the egress PE ················································································· 215

Configuring BGP AS number substitution and SoO attribute ·················································································· 216

Enabling SNMP notifications for MPLS L3VPN ········································································································· 216

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

Displaying and maintaining MPLS L3VPN ················································································································ 219

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

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

Configuring MPLS L3VPN over a GRE tunnel··································································································· 228

Configuring a hub-spoke network ····················································································································· 233

Configuring MPLS L3VPN inter-AS option A ···································································································· 239

Configuring MPLS L3VPN inter-AS option B ····································································································· 244

Configuring MPLS L3VPN inter-AS option C ···································································································· 249

Configuring MPLS L3VPN carrier's carrier ······································································································· 256

Configuring an OSPF sham link ························································································································ 280