Re[2]: [RPRWG] RPR multiring structures
Krzysztof,
At 11:21 PM 4/25/2003 +0200, Krzysztof Durałek wrote:
>Hello,
>
>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 ).
As a reference, using 2 points of contact has been a standard way of interconnecting SONET rings - you may want to search for the "matched nodes" concept in SONET
thanks
George
>--
>Best regards,
> Krzysztof Duralek mailto:kduralek@xxxxxxxxxxxxx