Configuring MPLS L3VPN ······································································································································· 161

Overview ······································································································································································· 161

Basic MPLS L3VPN architecture ························································································································· 161

MPLS L3VPN concepts ········································································································································ 162

MPLS L3VPN route advertisement ······················································································································ 163

MPLS L3VPN packet forwarding ························································································································ 164

MPLS L3VPN networking schemes ····················································································································· 165

Inter-AS VPN ························································································································································ 167

Carrier's carrier ··················································································································································· 171

Nested VPN ························································································································································· 173

HoVPN ·································································································································································· 174

OSPF VPN extension ··········································································································································· 176

BGP AS number substitution ······························································································································· 179

MPLS L3VPN FRR ················································································································································· 179

Protocols and standards ····································································································································· 181

MPLS L3VPN configuration task list ···························································································································· 181

Configuring basic MPLS L3VPN ································································································································· 182

Configuration prerequisites ································································································································ 182

Configuring VPN instances ································································································································ 182

Configuring routing between a PE and a CE ··································································································· 184

Configuring routing between PEs ······················································································································ 189

Configuring BGP VPNv4 route control ············································································································· 190

Configuring inter-AS VPN ··········································································································································· 192

Configuring inter-AS option A ···························································································································· 192

Configuring inter-AS option B ···························································································································· 192

Configuring inter-AS option C···························································································································· 193

Configuring nested VPN ·············································································································································· 197

Configuring HoVPN ····················································································································································· 198

Configuring an OSPF sham link ································································································································· 199

Configuring a loopback interface ····················································································································· 199

Redistributing the loopback interface route ······································································································ 200

Creating a sham link ··········································································································································· 200

Specifying the VPN label processing mode on the egress PE ················································································· 201

Configuring BGP AS number substitution ·················································································································· 201

Configuring MPLS L3VPN FRR ···································································································································· 201

Enabling logging for BGP route flapping ·················································································································· 204

Enabling SNMP notifications for MPLS L3VPN ········································································································· 204

Displaying and maintaining MPLS L3VPN ················································································································ 204

MPLS L3VPN configuration examples ························································································································ 206

Configuring basic MPLS L3VPN ························································································································ 206

Configuring a hub-spoke network ····················································································································· 211

Configuring MPLS L3VPN inter-AS option A ···································································································· 218

Configuring MPLS L3VPN inter-AS option B ····································································································· 223

Configuring MPLS L3VPN inter-AS option C ···································································································· 228

Configuring MPLS L3VPN carrier's carrier ······································································································· 235

Configuring an OSPF sham link ························································································································ 259

Configuring BGP AS number substitution ········································································································· 264

Configuring MPLS L3VPN FRR through VPNv4 route backup for a VPNv4 route ········································ 268

Configuring MPLS L3VPN FRR through VPNv4 route backup for an IPv4 route ··········································· 270

Configuring MPLS L3VPN FRR through IPv4 route backup for a VPNv4 route ············································· 272