Layer 2 VPN Architectures - dcfcpug

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Table of Contents
Copyright................................................................................................................................ 1
About the Authors.................................................................................................................. 4
About the Technical Reviewers............................................................................................... 5
Acknowledgments................................................................................................................... 7
Icons Used in This Book........................................................................................................ 19
Command Syntax Conventions.............................................................................................. 19
Introduction......................................................................................................................... 20
Part I: Foundation................................................................................................................ 25
Chapter 1. Understanding Layer 2 VPNs...................................................................................................................................................................................... 27
Understanding Traditional VPNs.............................................................................................................................................................................................. 27
Introducing Enhanced Layer 2 VPNs........................................................................................................................................................................................ 30
Summary.................................................................................................................................................................................................................................... 34
Chapter 2. Pseudowire Emulation Framework and Standards.................................................................................................................................................... 37
Pseudowire Emulation Overview.............................................................................................................................................................................................. 37
Pseudowire Emulation Standardization................................................................................................................................................................................... 44
Summary.................................................................................................................................................................................................................................... 49
Chapter 3. Layer 2 VPN Architectures........................................................................................................................................................................................... 51
Legacy Layer 2 VPNs.................................................................................................................................................................................................................. 51
Any Transport over MPLS Overview......................................................................................................................................................................................... 55
Layer 2 Tunnel Protocol Version 3 Overview............................................................................................................................................................................ 62
Summary.................................................................................................................................................................................................................................... 68
Part II: Layer 2 Protocol Primer............................................................................................ 71
Chapter 4. LAN Protocols.............................................................................................................................................................................................................. 73
Ethernet Background and Encapsulation Overview................................................................................................................................................................. 73
Metro Ethernet Overview.......................................................................................................................................................................................................... 76
Metro Ethernet Service Architectures....................................................................................................................................................................................... 77
Understanding Spanning Tree Protocol.................................................................................................................................................................................... 79
Pure Layer 2 Implementation................................................................................................................................................................................................... 83
802.1q Tunneling....................................................................................................................................................................................................................... 84
Summary.................................................................................................................................................................................................................................... 91
Chapter 5. WAN Data-Link Protocols........................................................................................................................................................................................... 93
Introducing HDLC Encapsulation............................................................................................................................................................................................. 93
Introducing PPP Encapsulation................................................................................................................................................................................................ 98
Understanding Frame Relay................................................................................................................................................................................................... 100
Understanding ATM................................................................................................................................................................................................................. 115
Summary................................................................................................................................................................................................................................... 131
Part III: Any Transport over MPLS...................................................................................... 135
Chapter 6. Understanding Any Transport over MPLS................................................................................................................................................................ 137
Introducing the Label Distribution Protocol........................................................................................................................................................................... 137
Understanding AToM Operations........................................................................................................................................................................................... 147
Summary.................................................................................................................................................................................................................................. 159
Chapter 7. LAN Protocols over MPLS Case Studies.................................................................................................................................................................... 161
Understanding Ethernet over MPLS Technology.................................................................................................................................................................... 161
EoMPLS Transport Case Studies.............................................................................................................................................................................................. 171
Common Troubleshooting Techniques................................................................................................................................................................................... 195
Summary.................................................................................................................................................................................................................................. 207
Chapter 8. WAN Protocols over MPLS Case Studies................................................................................................................................................................. 209
Setting Up WAN over MPLS Pseudowires.............................................................................................................................................................................. 209
Introducing WAN Protocols over MPLS.................................................................................................................................................................................. 215
Configuring WAN Protocols over MPLS Case Studies............................................................................................................................................................ 225
Advanced WAN AToM Case Studies....................................................................................................................................................................................... 255
Summary.................................................................................................................................................................................................................................. 268
Chapter 9. Advanced AToM Case Studies................................................................................................................................................................................... 271
Load Sharing............................................................................................................................................................................................................................ 271
Preferred Path.......................................................................................................................................................................................................................... 278
Case Study 9-5: Protecting AToM Pseudowires with MPLS Traffic Engineering Fast Reroute............................................................................................ 297
Case Study 9-6: Configuring AToM Pseudowire over GRE Tunnel....................................................................................................................................... 304
Pseudowire Emulation in Multi-AS Networks........................................................................................................................................................................ 309
Case Study 9-10: Configuring LDP Authentication for Pseudowire Signaling....................................................................................................................... 333
Verifying Pseudowire Data Connectivity................................................................................................................................................................................ 334
Quality of Service in AToM...................................................................................................................................................................................................... 342
Summary.................................................................................................................................................................................................................................. 351
Part IV: Layer 2 Tunneling Protocol Version 3.................................................................... 353
Chapter 10. Understanding L2TPv3............................................................................................................................................................................................ 355
Universal Transport Interface: L2TPv3’s Predecessor........................................................................................................................................................... 355
Introducing L2TPv3................................................................................................................................................................................................................. 358
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Summary.................................................................................................................................................................................................................................. 369
Chapter 11. LAN Protocols over L2TPv3 Case Studies............................................................................................................................................................... 373
Introducing the L2TPv3 Configuration Syntax....................................................................................................................................................................... 373
LAN Protocols over L2TPv3 Case Studies.............................................................................................................................................................................. 380
Summary.................................................................................................................................................................................................................................. 414
Chapter 12. WAN Protocols over L2TPv3 Case Studies.............................................................................................................................................................. 417
WAN Protocols over L2TPv3 Technology Overview............................................................................................................................................................... 417
Configuring WAN Protocols over L2TPv3 Case Studies......................................................................................................................................................... 428
Summary.................................................................................................................................................................................................................................. 475
Chapter 13. Advanced L2TPv3 Case Studies............................................................................................................................................................................... 477
Case Study 13-1: L2TPv3 Path MTU Discovery....................................................................................................................................................................... 477
Advanced ATM Transport over L2TPv3................................................................................................................................................................................. 500
Quality of Service...................................................................................................................................................................................................................... 513
Summary.................................................................................................................................................................................................................................. 529
Part V: Additional Layer 2 VPN Architectures..................................................................... 531
Chapter 14. Layer 2 Interworking and Local Switching............................................................................................................................................................. 533
Layer 2 Interworking Technology Overview........................................................................................................................................................................... 533
Layer 2 Interworking Case Studies......................................................................................................................................................................................... 538
Layer 2 Local Switching........................................................................................................................................................................................................... 571
Layer 2 Local Switching with Interworking............................................................................................................................................................................. 577
Understanding Advanced Interworking and Local Switching............................................................................................................................................... 580
Summary.................................................................................................................................................................................................................................. 588
Chapter 15. Virtual Private LAN Service..................................................................................................................................................................................... 591
Understanding VPLS Fundamentals....................................................................................................................................................................................... 591
VPLS Deployment Models....................................................................................................................................................................................................... 598
VPLS Configuration Case Studies........................................................................................................................................................................................... 603
Summary.................................................................................................................................................................................................................................. 625
L2TPv3 AVP Attribute Types...................................................................................................................................................................................................... 627
bvdindexIndex.................................................................................................................... 631
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
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Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
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Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Licensed by
Rodney Mitchell
994865
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Licensed by
Rodney Mitchell
994865
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from
the copyright owner. Unauthorized use, reproduction and/or distribution are strictly prohibited and violate applicable laws. All rights reserved.
Layer 2 VPN Architectures. Layer 2 VPN Architectures, ISBN: 9780132492485
Prepared for netguru247365@mac.com, Rodney Mitchell
Copyright© 2005 Cisco Systems, Inc.. This download file is made available for personal use only and is subject to the Terms of Service. Any other use requires prior written consent from