>
>
> I have one on the BGP Route Decision Process. In pages 168 & 169 of
>"Internet Routing Architectures," it gives the steps through attributes it
>takes when deciding between multiple routes to a destination. I wont list all
>of them but if you have the book you know what I'm talking about. If every
>attribute matches all the way down the list to the last one, the router with
>the highest IP or Loopback address will be the chosen one.
>
> This I understand perfectly and I know that it usually wouldn't even
>get this far down the list but I find myself again playing the devil's
>advocate. What if the loopbacks on both devices were the same? I know you
>could just change one but let's say you didn't. How would it finally make
>it's decision? Let's pretend everything was the same...would it just, ummm,
>pick one? Would it kinda just spin a wheel and see what it lands on kinda
>like telco's do to give an RFO? ;)
>
>Thanks ahead of time for responses folks...it's appreciated. Love your show.
>
>Mark Zabludovsky ~ CCNA, CCDA, 1/4-NP
In formal testing methodology, as defined in ISO 9646, there are
three kinds of conditions that can be used to test protocols:
-- correct behavior, typically at the limits of parameters
-- incorrect behavior, where the packet is errored
-- inopportune behavior, where the individual packet is correct but the
context is wrong for receiving it
What you are describing is an inopportune packet. BGP doesn't
consider how to handle such--it really doesn't have the information
to make a decision. Netsys might very well catch a configuration
error of this type.
The specific response to receiving such an update really would be
implementation-dependent, but I suspect that most implementations
would use the most recently received update.
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