However, it
could be used profitably in the core of an 802.1ah MAC-in-MAC network.
Optionally, SPB will be used only to construct a few spanning trees, and these will be
used exactly as they are used today in MSTP. As described, this is an advantage, not a
disadvantage, for provider networks. The use of link state, instead of distance vector,
technology by SPB will ensure that the convergence times of the network are more
predictable and the worst-case convergence time will be shorter than for the current
MSTP algorithm.
It is a major goal of P802.1aq to ensure that the changes to the data forwarding plane
and thus the existing bridge hardware are as few and simple as possible. The details
will depend on exactly what features of P802.1aq will be employed, on the specifics of
each implementation, and of course, on the details of the standard as finally approved.
However, you can expect that many of the capabilities of P802.1aq will be available to
all existing bridges, and that many existing bridges will be able to take full advantage
of P802.1aq with few, if any, hardware updates.
ITU-T Protection Switching
ITU-T Study Group 15, Working Party 3, Question 12, has produced a recommendation
G.
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