Yes the spec says the length values are even values between 2 and 30,
but I have never seen any support for greater than 7 hops (maybe a
sheltered existence).  Isn't the practical limit still the original IBM
spec with the length limit of 18?  The 802.5 spec says ".. 18 bytes
being the minimum that must be supported."  Would you really want a
network with 13 hops?

And if there is a test question on  max hops would you answer 7 or 13?

Cheers, Fred.



Priscilla Oppenheimer wrote:
> 
> The Length field in the RC field indicates the total length of the RIF.
> Length values will be even values between 2 and 30 inclusive.
> 
> Source-route bridging is documented in Annex C of IEEE 802.1D MAC Bridges.
> You can get it for free now from IEEE. There's no need to rely on the
> sloppy work of authors who pump out multiple books per year. ;-)
> 
> Get the IEEE docs here:
> 
> http://standards.ieee.org/getieee802/
> 
> Priscilla
> 
> At 08:04 PM 1/1/02, Jason wrote:
> >All,
> >
> >Is the length field in the RC of a RIF the total size of the RIF or the
> >total size of the RD?
> >
> >According to the Rossi paper it is the total length of the RIF.
> >
> >         Pg 5 "Bits 12-8 (next 5) bits descrige the total length of the
RIF
> >represented in bytes"
> >
> >         Example from the Rossi paper :  0830 00a1 014f 01e0 (Page 5)
> >
> >However, in the Lammle/Swartz Study guide it is the total length of the
RD.
> >
> >         Pg 694 "The Length field is the number of bytes used by the route
> >descriptors."
> >
> >         Example from the Study Guide : 0490 020b 1000 (answer C question
> 20)
> >
> >Any and all help would be appreciated.
> >
> >Thanks
> >js
> ________________________
> 
> Priscilla Oppenheimer
> http://www.priscilla.com




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