[isp-bgp] Re: MEDs from different ASes

[Danny McPherson <danny@...>]

On May 20, 2004, at 6:44 PM, Ton Schoenmakers wrote:
> Enabling the bgp deterministic-med command ensures the comparison of  
> the MED variable when choosing routes advertised by different peers in  
> the same autonomous system (AS).
Actually, this has more to do with MED-based temporal route
selection than different peers (paths) in the same AS.  Used to
be that IOS by default preferred the "oldest" route rather than
the lower MED value in order to try and add some semblance
of stability to path advertisement.  The problem is, this opens
the door for non-deterministic path selection and can result in
forwarding loops - hence the addition of the "bgp deterministic-
med" parameter (note: several other implementations select paths
deterministically by default).

> Full description at  
> http://www.cisco.com/en/US/partner/tech/tk365/tk80/ 
> technologies_tech_note09186a0080094925.shtml
Disclaimer: I didn't actually read this (per it required a CCO login,
of which my account is currently locked), so I'm not sure if it's
correct or not :-)

-danny







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