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Status: Held for Document Update (1)

RFC 4191, "Default Router Preferences and More-Specific Routes", November 2005

Errata ID: 1838
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT
Reported By: Glen Zorn
Date Reported: 2009-08-24
Held for Document Update by: Brian Haberman

Section 2.1 says:

   Default router preferences and preferences for more-specific routes
   are encoded the same way.

   Preference values are encoded as a two-bit signed integer, as
   follows:

      01      High
      00      Medium (default)
      11      Low
      10      Reserved - MUST NOT be sent

   Note that implementations can treat the value as a two-bit signed
   integer.

It should say:

   Default router preferences and preferences for more-specific routes
   are encoded the same way.

   Preference values are encoded in 2 bits, as
   follows:

      01      High
      00      Medium (default)
      11      Low
      10      Reserved - MUST NOT be sent

   Note that implementations can treat the value as a two-bit signed
   integer.

Notes:

The characterization of route preferences as a 2-bit integer is extremely confusing. Fortunately, -(0) is not used, but even so there seems to be little rationale for looking treating the preference as a signed rather than unsigned value.

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