phill.jolliffe at gmail.com
Sun Dec 19 21:08:53 EST 2010
This can be seen on BGP routes in general. I remembered some wierdness
with respect to 1 complements and google turned up the following.
In order to use common comparison routines, JUNOS software stores the
1's complement of the LocalPref value in the Preference2 field. For
example, if the LocalPref value for Route 1 is 100, the Preference2
value is -101. If the LocalPref value for Route 2 is 155, the
Preference2 value is -156. Route 2 is preferred because it has a
higher LocalPref value and a lower Preference2 value.
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