This field indicates whether DC-BGP treats the multi-exit discriminator (MED) for a BGP route received with no MED as having the worst possible priority value. If this is FALSE then DC-BGP treats the MED for such a route as being zero (the best or most preferred priority value). This is the default behavior and is required for DC-BGP to use the decision process as defined in the BGP standards. If this is TRUE then DC-BGP treats the MED for such a route as being 0xFFFFFFFF (the worst or least preferred priority value). All BGP routers in an AS should have the same configuration for this field to avoid routing loops. This field can only be changed when the Admin Status is down.