I'll try to answer your question, someone please correct me if I missed
something or said something wrong.
to answer your question, he is
not taking into account the last bridge number which is 0. When he says 2
brides, he means 2 real bridges, and an assumed 3rd bridge to complete
the last 4 bits of the last ring/bridge pair.
On Wed, 14 Feb 2001, perryb wrote:
> Hello all,
>
> I'm a little confused over "length" bits in the RIF. The Token Ring White
> Paper (Lou Rossi), states that "bits 12 through 8 describe the total length
> represented in bytes." It goes on to say that a value of "a" indicates
> there are 3 bridges, an "8" indicates there are 2 bridges, and a "6"
> indicates there is one (1) bridge.
>
> My question is this: Does the above parameters take int0 account the very
> last bridge i.e., since all RIFs end in a bridge of "0," is this last bridge
> (0) included in the count of the length bits?
>
> Example:
>
> Packet type = specific route
> Direction ---->
> Frame size = 512
>
> Host1--ring--bridge--ring--bridge--ring--Host2
>
> Would this be a "0830.xxxx.xxxx.xxx0" or a "0A30.xxxx.xxxx.xxx0"
>
> The reason that I ask, is because on several CCIE practice test, as well as
> the actual written exam, the answers do not seem to regard this fine point.
>
> thanks
>
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