[isp-bgp] Re: MEDs from different ASes

[Pete Templin <petelists@...>]

Tulip Rasputin wrote:
> I am aware of how we can configure the boxes so that the MEDs are always
> compared, even across the ASes. What i wanted to know was, *why* would
> somebody ever want to do that?
Somebody would (er...might) want to do that if they had multiple pipes 
in different geographic areas, and knew that their providers carried 
reasonable AND COMPARABLE "distance" information in their MED values. 
This became a little simpler with additive MED, but not necessarily easy 
or predictable.  Setting outbound MED to match the internal IGP metric 
is a start, but I've moved to a 10Gb reference bandwidth which would 
theoretically mess up the comparison with another ISP.

I would have to say that I somewhat echo Danny's statement that I'm not 
a strong supporter of MEDs.  I'm experimenting with them in my lab and 
production networks (I know, I know...), but not seeing significant 
benefits and limited ability to put them to work.

pt






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