Optical Networks - _12_5 Burst Switching_137

Optical Networks - _12_5 Burst Switching_137 - 688 Photonic...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
688 Photonic Packet Switching the packet is again deflected. Such limited-buffer deflection-routing strategies achieve higher throughputs compared to the purest form of deflection routing without any buffers whatsoever. We refer to [Max89, FBP95] for the quantitative details. Livelock When a network employs deflection routing, there is the possibility that a packet will be deflected forever and never reach its destination. This phenomenon has been called both deadlock [GG93] and livelock [LNGP96], but the term livelock seems to be more appropriate. Livelock is somewhat similar to routing loops encountered in store-and-forward networks (see Section 6.5), but routing loops are a transient phe- nomenon there, whereas livelock is an inherent characteristic of deflection routing. Livelock can be eliminated by suitably designed deflection rules. However, prov- ing that any particular deflection rule is livelock-free seems to be hard. We refer to [GG93, BDG95] for further discussion of this issue (under the term
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/15/2011 for the course ECE 6543 taught by Professor Boussert during the Spring '09 term at Georgia Institute of Technology.

Ask a homework question - tutors are online