Troubleshooting MTU Problems in a Point-to-Point MPLS LSP Associated
with a VPLS Instance ......................................................................378
Chapter 5 Configuring BGP-MPLS Applications 379
Overview .....................................................................................................379
Address Families ...................................................................................380
Equal-Cost Multipath Support ................................................................381
BGP/MPLS VPN Components ................................................................382
VPN-IPv4 Addresses ..............................................................................385
Route Targets ........................................................................................385
Distribution of Routes and Labels with BGP ..........................................386
Platform Considerations ..............................................................................389
References ..................................................................................................389
Transporting Packets Across an IP Backbone with MPLS .............................390
Configuring IPv6 VPNs ................................................................................394
Intra-AS IPv6 VPNs ......................................................................................395
BGP Control Plane Behavior ..................................................................396
CE–PE Behavior ....................................................................................396
PE–PE Behavior ....................................................................................397
MPLS Data Plane Behavior ....................................................................397
Providing IPv4 VPN Services Across Multiple Autonomous Systems ............397
Inter-AS Option A ..................................................................................398
Inter-AS Option B ..................................................................................398
Inter-AS Option C ..................................................................................402
Inter-AS Option C with Route Reflectors ...............................................404
Providing IPv6 VPN Services Across Multiple Autonomous Systems ............405
Using Route Targets to Configure VPN Topologies .......................................406
Full-Mesh VPNs .....................................................................................406
Hub-and-Spoke VPNs ............................................................................407
Overlapping VPNs .................................................................................408
Constraining Route Distribution with Route-Target Filtering ........................410
Exchanging Route-Target Membership Information ..............................411
Receiving and Sending RT-MEM-NLRI Routing Updates ........................412
Conditions for Advertising RT-MEM-NLRI Routes ..................................414
Advertising a Default Route ..................................................................414
Route Selection When Route-Target Filtering Is Enabled .......................416
Configuring Route-Target Filtering ........................................................417
Multicast Services over VPNs .......................................................................418
Configuring BGP VPN Services ....................................................................418
VRF Configuration Tasks .......................................................................418
PE Router Configuration Tasks ..............................................................420
Creating a VRF ......................................................................................421
Specifying a Route Distinguisher ...........................................................422
Defining Route Targets for VRFs ...........................................................422
Setting Import and Export Maps for a VRF ............................................426
Characteristics of Import and Global Import Maps ..........................427
Characteristics of Export and Global Export Maps ..........................428
Subsequent Distribution of Routes .................................................429
Creating a Map ...............................................................................429
Table of Contents â– xvii
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