Proposed replacement text:An implementation MUST have some means of preventing loops. Loop prevention SHOULD be done by having the proxy implement the Spanning Tree Algorithm and Protocol as defined in [BRIDGE] on all proxy interfaces, as described below.
Is this strong enough for interoperability across ND-proxies from different vendors? Loop prevention won't do much good unless every vendor implements an interoperable mechanism..
The text is also a bit contradictory: "An implementation MUST have some means.." and "The mechanism is required only if...". Granted, there are some cases where it may be physically impossible (or extremely difficult) to use the implementation to form a loop, but in the general case, the implementor really cannot know how the devices will end up being used. Maybe the first sentence needs to be reworded slightly to include an escape clause there as well.
-- Pekka Savola "You each name yourselves king, yet the Netcore Oy kingdom bleeds." Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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