The short answer is yes. Examples:
c6 10 00 11 00 20 >6 bytes, ring 1 bridge 1 to ring 2
c8 10 00 11 00 21 00 30 >8 bytes, ring 1 bridge 1 to ring 2 bridge 1 to
ring 3
ca 10 00 11 00 21 00 31 00 40 > 10 bytes, 3 bridges
max is 7 bridges, 18 bytes.
d2 10 00 11 00 21 00 31 00 41 00 51 00 61 00 71 00 80 > 18 bytes, 7
bridges
The length bits are bits 3-7 in the first byte of the RIF Routing
Control Field.
This field can be represented as:
BBBLLLLL with the convention of leftmost bit being bit 0, rightmost, 7.
The B's are the broadcast indicators, and the L's are the length bits.
HTH., Fred.
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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