RE: Re[2]: [RPRWG] RPR multiring structures
> AG> If you do 802.1D/Q bridging on RPR as recommeded by
> AG> P802.17, you lose the spatial reuse property of RPR,
> AG> regardless of whether it's a single ring or multi-ring
> AG> solution. A bridge between RPR rings would operate the
> AG> same way as a bridge between Ethernet or token ring
> AG> segments.
>
> Yes, I know that, but there is more contraindications - for instance:
> what would happen during failure in structure created by 3
> rings cooperating one
> each other. Let suppose that rings have one point of contact ( I mean
> that one node is bridge for two separate rings ), and failure object
> is not a span between rings, but a specific node ( total damage of the
> node - the node couldn't work at all ). In this situation one of the
> rings is switched off structure. The only solution is to make more
> points of contact ( 2 or 3 ).
That is a correct observation and it is indeed a valid
concern. However, the standard doesn't deal with protection
issues outside of a single ring (those depend on the
higher layer protocol that is used, such as MPLS or 802.1D
spanning tree), or with issues such as node-level redundancy
(which should be addressed by network engineering).
-Anoop