Juniper JUNOSE 11.2.X BGP AND MPLS User Manual

Figure 39: Administrative Distance and Synchronization . . . . . . . . . . . . . . . . . . . 136
Figure 40: Backdoor Route . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Figure 41: A Fully Meshed Autonomous System . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Figure 42: A Confederation of Subautonomous Systems . . . . . . . . . . . . . . . . . . . 143
Figure 43: Simple Route Reflection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Figure 44: Route Reflection: Logical Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . 146
Figure 45: Route Reflection: Physical and Logical Redundancy . . . . . . . . . . . . . . 146
Figure 46: BGP Route Reflection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Part 2 Multiprotocol Layer Switching
Chapter 3 MPLS Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Figure 47: Simple MPLS Domain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
Figure 48: Label Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
Figure 49: Label Stacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
Figure 50: Shim Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
Figure 51: TTL Processing on Incoming MPLS Packets . . . . . . . . . . . . . . . . . . . . . 224
Figure 52: TTL Processing on Outgoing MPLS Packets . . . . . . . . . . . . . . . . . . . . 226
Figure 53: LSP Creation, Downstream-on-Demand, Ordered Control . . . . . . . . . 228
Figure 54: LSP Creation, Downstream-Unsolicited, Independent Control . . . . . 229
Figure 55: Explicit Routing in an MPLS Domain . . . . . . . . . . . . . . . . . . . . . . . . . . 236
Figure 56: MPLS Interface Stacking for the Platform Label Space . . . . . . . . . . . 237
Figure 57: MPLS Interface Stacking for the Interface Label Space . . . . . . . . . . . 238
Figure 58: LDP Tunneled Through an RSVP-TE Core . . . . . . . . . . . . . . . . . . . . . . 256
Figure 59: Flow for Initial Setting of EXP Bits for the First Label Pushed . . . . . . . 270
Figure 60: Flow for Setting EXP Bits for All Pushed Labels . . . . . . . . . . . . . . . . . . 271
Figure 61: Simple MPLS Domain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
Chapter 4 Configuring MPLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
Figure 62: FEC Aggregation and Equal-Cost Paths . . . . . . . . . . . . . . . . . . . . . . . 289
Figure 63: Bypass Tunnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295
Figure 64: Differentiated Services over an MPLS Network . . . . . . . . . . . . . . . . . 306
Figure 65: Associations Between PHB ID, EXP Bits, and Traffic
Classes/Colors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311
Figure 66: Signaled Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311
Chapter 5 Monitoring MPLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
Figure 67: Sample MPLS L3VPN Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373
Chapter 6 Configuring BGP-MPLS Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383
Figure 68: ECMP BGP/MPLS VPN Scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 386
Figure 69: BGP/MPLS VPN Scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387
Figure 70: BGP/MPLS VPN Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 388
Figure 71: Route and Label Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 390
Figure 72: Standard and Extended BGP Update Messages . . . . . . . . . . . . . . . . . 392
Figure 73: BGP/MPLS VPN Route Exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394
Figure 74: LSP Creation for BGP/MPLS VPN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396
Figure 75: Traffic Across the MPLS Backbone of a BGP/MPLS VPN . . . . . . . . . . 396
Figure 76: IPv6 VPN Services over IPv4 MPLS . . . . . . . . . . . . . . . . . . . . . . . . . . . 399
Figure 77: Inter-AS Topology with VRFs on Each AS Boundary Router . . . . . . . . 401
Copyright © 2010, Juniper Networks, Inc.xxvi
JunosE 11.2.x BGP and MPLS Configuration Guide

Juniper JUNOSE 11.2.X BGP AND MPLS Specifications

General

Brand	Juniper
Model	JUNOSE 11.2.X BGP AND MPLS
Category	Software
Language	English