It appears, at this writing, that this separation of different clouds??™ spanning trees will
be incorporated into the provider backbone bridge standard, IEEE 802.1ah.
Ring Topology Algorithms As mentioned previously, a ring topology is the worst topology
in terms of the time taken by the current spanning tree algorithms to converge after a
failure. A number of vendors have created proprietary solutions. These solutions have
in common the ability to reconfigure very quickly after the failure of a link in a ring of
bridges and to handle two (or more) rings connected to each other at multiple points.
Similarly, they have in common the ability to disrupt the operation of the network
completely if the topology of the network is not, in fact, as configured??”whether that is
due to improper configuration or to miswired connections. In practice, many network
operators find the faster convergence time well worth the chances for disruption due
to misconfiguration or miswiring. These proprietary algorithms vary in their ability to
work well with the spanning tree algorithms, which are necessary in mesh networks.
Enquiries of potential vendors in this regard are encouraged.
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