RFC 5340, "OSPF for IPv6", July 2008

Errata ID: 3350
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Michael Barnes
Date Reported: 2012-09-12
Verifier Name: Stewart Bryant
Date Verified: 2013-01-07

Section 2.7 says:

   o  Two Options bits, the "R-bit" and the "V6-bit", have been added to
      the Options field for processing router-LSAs during the SPF
      calculation (see Appendix A.2).  If the "R-bit" is clear, an OSPF
      speaker can participate in OSPF topology distribution without
      being used to forward transit traffic; this can be used in multi-
      homed hosts that want to participate in the routing protocol.  The
      V6-bit specializes the R-bit; if the V6-bit is clear, an OSPF
      speaker can participate in OSPF topology distribution without
      being used to forward IPv6 datagrams.  If the R-bit is set and the
      V6-bit is clear, IPv6 datagrams are not forwarded but datagrams
      belonging to another protocol family may be forwarded.

It should say:

   o  Two Options bits, the "R-bit" and the "V6-bit", have been added to
      the Options field for processing router-LSAs during the SPF
      calculation (see Appendix A.2).  If the "R-bit" is clear, an OSPF
      speaker can participate in OSPF topology distribution without
      being used to forward transit traffic; this can be used in multi-
      homed hosts that want to participate in the routing protocol. An
      Area Border Router MUST advertise a consistent R-bit setting in
      its self-originated router-LSAs for all attached areas. 
      The V6-bit specializes the R-bit; if the V6-bit is clear, an OSPF
      speaker can participate in OSPF topology distribution without
      being used to forward IPv6 datagrams.  If the R-bit is set and the
      V6-bit is clear, IPv6 datagrams are not forwarded but datagrams
      belonging to another protocol family may be forwarded.

Notes:

This addresses a corner case.

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