PE–PE Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400
MPLS Data Plane Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400
Providing IPv4 VPN Services Across Multiple Autonomous Systems . . . . . . . . . 401
Inter-AS Option A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401
Inter-AS Option B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402
Inter-AS Option C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 405
Inter-AS Option C with Route Reflectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407
Providing IPv6 VPN Services Across Multiple Autonomous Systems . . . . . . . . . 408
Using Route Targets to Configure VPN Topologies . . . . . . . . . . . . . . . . . . . . . . . 409
Full-Mesh VPNs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 409
Hub-and-Spoke VPNs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 410
Overlapping VPNs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411
Constraining Route Distribution with Route-Target Filtering . . . . . . . . . . . . . . . . 413
Exchanging Route-Target Membership Information . . . . . . . . . . . . . . . . . . . 414
Receiving and Sending RT-MEM-NLRI Routing Updates . . . . . . . . . . . . . . . . 415
Conditions for Advertising RT-MEM-NLRI Routes . . . . . . . . . . . . . . . . . . . . . 417
Advertising a Default Route . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 418
Route Selection When Route-Target Filtering Is Enabled . . . . . . . . . . . . . . . 419
Configuring Route-Target Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 420
Multicast Services over VPNs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421
Configuring BGP VPN Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421
VRF Configuration Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421
PE Router Configuration Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 423
Creating a VRF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424
Specifying a Route Distinguisher . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424
Defining Route Targets for VRFs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425
Setting Import and Export Maps for a VRF . . . . . . . . . . . . . . . . . . . . . . . . . . 428
Characteristics of Import and Global Import Maps . . . . . . . . . . . . . . . . 429
Characteristics of Export and Global Export Maps . . . . . . . . . . . . . . . . 430
Subsequent Distribution of Routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430
Creating a Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 431
Export Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 431
Global Export Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 432
Import Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 432
Global Import Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433
Global Export of IPv6 VPN Routes into the Global BGP IPv6 RIB . . . . . . . . . 433
Assigning an Interface to a VRF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434
Defining Secondary Routing Table Lookup . . . . . . . . . . . . . . . . . . . . . . . . . . 435
Adding Static Routes to a VRF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 436
Configuring IGPs on the VRF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437
Configuring the IGP in the VRF Context . . . . . . . . . . . . . . . . . . . . . . . . . 437
Configuring the IGP Outside the VRF Context . . . . . . . . . . . . . . . . . . . . 438
Disabling Automatic Route-Target Filtering . . . . . . . . . . . . . . . . . . . . . . . . . 439
Creating Labels per FEC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439
Configuring PE-to-PE LSPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441
Enabling BGP Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441
Enabling BGP ECMP for BGP/MPLS VPNs . . . . . . . . . . . . . . . . . . . . . . . . . . . 441
Enabling VPN Address Exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 444
Configuring PE-to-CE BGP Sessions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 445
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