[isp-bgp] MEDs from different ASes

["Tulip Rasputin" <tulip_rasputin@...>]

Hello,

I am able to comprehend the concept of comparing MEDs for the routes that we
recieve from the same AS. What confuses me is when, would we really want to
compare MEDs across different ASes? MEDs can mean different things to
different operators, one could be reflecting the internal IGP costs in the
MED, the other could be doing something totally different. How and in what
scenario, will we want to compare MEDs across different ASes?

Can anybody throw any light on this? Has anybody ever done that? And if yes,
then when?

One reason which i can think of at the top of my head is to avoid RFC 3345
oscillations. We may use always-compare-MED to prevent those. But then there
are many topological solutions that can help prevent those oscillations.

Thanks,
Rasputin








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