Re: Why doesn't BGP...

[Peter Lothberg <roll () Stupi SE>]

>  * Why doesn't BGP pick the link with the highest bandwidth, or, better
>  * yet, pick the link with the highest bandwidth AND least congestion to
>  * label as the "best" available route?  The needed information is avail-
>
> The first one is easy, in fact you can do that yourself by fiddling
> with metrics or such on the different BGP sessions. The second one
> would have dramatic consequences in terms of route instability. You
> pick one route now because of load on the link, the load changes and
> you pick the other, now BGP will have to change the announcement of
> this network to other peers. So, now we not only have flaps because of
> links/routers going up and down, we also have flap because of load
> changes on the network. The result: you are dampened out forever, or
> the network falls over.
>
> -Marten


On the radio1::

                "101 north is congested, take 280 instead"

        
Guess what hapens 5 minutes laster;

On the radio2:: 
                "280 north is congested, take 101 instead"


goto on the radio1

--Peter
- - - - - - - - - - - - - - - - -