4. Practical Deployment Considerations

  1. David Allan and
  2. Nigel Bragg

Published Online: 13 FEB 2012

DOI: 10.1002/9781118164327.ch4

802.1aq Shortest Path Bridging Design and Evolution: The Architect's Perspective

802.1aq Shortest Path Bridging Design and Evolution: The Architect's Perspective

How to Cite

Allan, D. and Bragg, N. (2012) Practical Deployment Considerations, in 802.1aq Shortest Path Bridging Design and Evolution: The Architect's Perspective, John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9781118164327.ch4

Publication History

  1. Published Online: 13 FEB 2012
  2. Published Print: 23 FEB 2012

ISBN Information

Print ISBN: 9781118148662

Online ISBN: 9781118164327

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Keywords:

  • dual homing;
  • Ethernet;
  • in-service upgrade;
  • Intermediate System to Intermediate System (IS-IS);
  • shared segment;
  • shortest path bridging (SPB)

Summary

There are numerous reasons for making in-service changes to network configuration; one important reason is to modify how the traffic matrix is distributed within the network in order to relieve “hot spots”. The chapter discusses two dual-homing techniques, the first of which is a “minimum resource” approach, and the second offers “minimum visibility”. Although shared segment is reasonable to ignore a physical multiple access LAN segment when nearly all physical connectivity is fiber, an Shortest Path Bridging (SPB) overlay of an emulated LAN segment is a real deployment scenario. The chapter first explains how Intermediate System to Intermediate System (IS - IS) itself already supports LAN segments and then enumerate the potential looping challenges in the forwarding plane which LAN segments present. It then concludes by outlining the extensions to Ethernet needed to mitigate these issues.

Controlled Vocabulary Terms

Ethernet networks