Martijn Van Overbeek left this comment on my LinkedIn post announcing the BGP MED lab: It might be fixed, but I can recall in the past that there was a lot of quirkiness in multi-vendor environments, especially in how different vendors use it and deal with the setting when the attribute does exist or does not have to exist. TL&DR: He's right. It has been fixed (mostly), but the nerd knobs never went away. In case you're wondering about the root cause, it was the vagueness of rfc 1771. Now for the full story 😉
Source: The BGP Multi-Exit Discriminator (MED) Saga « ipSpace.net blog