Juniper M10i Application Note

Juniper m10i: user guide
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APPLICATION NOTE
DEMYSTIFYING H-VPLS
Understanding How Hierarchical Virtual Private LAN Services Address Service
Provider Needs and Impact Networks
Copyright © 2010, Juniper Networks, Inc.

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Summary of Contents for Juniper M10i

  • Page 1 APPLICATION NOTE DEMYSTIFYING H-VPLS Understanding How Hierarchical Virtual Private LAN Services Address Service Provider Needs and Impact Networks Copyright © 2010, Juniper Networks, Inc.
  • Page 2: Table Of Contents

    Figure 6: Quadrant comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Copyright © 2010, Juniper Networks, Inc.
  • Page 3: Introduction

    While this creates signaling overhead, the real detriment to large scale deployment is the packet replication requirements for each provisioned pseudowires on a PE router. Hierarchical connectivity, described in this document, reduces signaling and replication overhead to allow large-scale deployment.
  • Page 4: Figure 1: Active And Back-Up Paths

    PE-rs, which is one of the main motivations for using H-VPLS, is not an exclusive capability of LDP-based H-VPLS. Routers may have this capability regardless of the signaling protocol that is being used. This is indeed possible with Juniper Networks MTU-s...
  • Page 5: What Is H-Vpls Being Used For Today

    Therefore, H-VPLS tries to address not only the architectural scaling issues of VPLS, but also the vendor-specific implementation limits of the platforms. Copyright © 2010, Juniper Networks, Inc. Multicast-traffic replicated by Ingress PE...
  • Page 6: Creative" Applications For H-Vpls

    H-VPLS spoke, so effectively the split horizon rule is not applied, and traffic received on a pseudowire is forwarded to the next replication point. MAC table LDP active psuedowire LDP backup psuedowire Figure 3: Traffic sent N time over the same link of the ring Copyright © 2010, Juniper Networks, Inc.
  • Page 7: Figure 4: Dual Paths And Spanning Tree

    Spanning Tree days. Is this the way to go? Should service providers rely on this architecture to transport their IPTV traffic? Each will need to make this judgment based on business requirements. Copyright © 2010, Juniper Networks, Inc. MAC table...
  • Page 8: A Better Approach To Scale Vpls Services

    LSPs, either based on LDP or RSVP-TE (each one with its advantages). So why not go to the origin of the problem and solve it? This is what Juniper has been proposing by integrating the use of point-to-multipoint LSPs with VPLS in such a way that broadcast, multicast, and unknown unicast will be forwarded using point-to-multipoint LSP, which will only be replicated on the network where the network really requires it.
  • Page 9: Service Reachability

    There are always trade-offs and in many cases mutual dependencies exist among them, so increasing one might decrease the other. Copyright © 2010, Juniper Networks, Inc. 10.3. Multi-domain VPLS Service...
  • Page 10: Summary

    S-VPLS, then that would be BGP-based VPLS with point-to-multipoint LSPs. Highest Vlans/QinQ + xSTP LDP H-VPLS + xSTP Lowest Lowest Operational complexity Figure 6: Quadrant comparison CARRIER CLASS QUADRANT BGP VPLS + P2MP LSP LDP H-VPLS LDP VPLS Highest Reliability Copyright © 2010, Juniper Networks, Inc.
  • Page 11: Reference Documents

    Copyright 2010 Juniper Networks, Inc. All rights reserved. Juniper Networks, the Juniper Networks logo, Junos, NetScreen, and ScreenOS are registered trademarks of Juniper Networks, Inc. in the United States and other countries. All other trademarks, service marks, registered marks, or registered service marks are the property of their respective owners.

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