Hi Acee, Rajesh, RFC 6565 states that the same communities, defined in RFC 4577, are reused.
Just before the text, quoted by Rajesh, there is statement: "The BGP Extended Communities attributes defined in [RFC4577] are reused for convenience." RFC 4577 defines sub-type 0x05 and also refers to RFC 4360, where 0x00 and 0x01 types are defined. Only gap, that I notice, is that RFC 4360 (and RFC 4577) mentions type 0x02, but doesn't define that type and doesn't point to reference of its definition (it was defined later in RFC 5668). > 17 сент. 2021 г., в 17:15, Acee Lindem (acee) > <[email protected]> написал(а): > > Hi Rajesh, > > This is the extended community type and RFC 6565 really should have had some > references for this - It took me a good 15-20 minutes to recall all the > details. The first octet specifies the extended community type of domain ID > as defined in https://www.rfc-editor.org/rfc/rfc7153.html#section-5.1.1 > <https://www.rfc-editor.org/rfc/rfc7153.html#section-5.1.1> > > TYPE VALUE NAME > > 0x00 Transitive Two-Octet AS-Specific Extended > Community (Sub-Types are defined in the > "Transitive Two-Octet AS-Specific Extended > Community Sub-Types" registry) > > 0x01 Transitive IPv4-Address-Specific Extended > Community (Sub-Types are defined in the > "Transitive IPv4-Address-Specific Extended > Community Sub-Types" registry) > > 0x02 Transitive Four-Octet AS-Specific Extended > Community (Sub-Types are defined in the > "Transitive Four-Octet AS-Specific Extended > Community Sub-Types" registry) > > > The second octet (0x05) is the registered sub-type value for the OSPF Domain > Identifier. See https://www.rfc-editor.org/rfc/rfc4577.html#page-10 > <https://www.rfc-editor.org/rfc/rfc4577.html#page-10>. > > Hope this helps, > Acee > > From: Lsr <[email protected] <mailto:[email protected]>> on behalf of > Rajesh M <[email protected] <mailto:[email protected]>> > Date: Friday, September 17, 2021 at 5:44 AM > To: "[email protected] <mailto:[email protected]>" <[email protected] <mailto:[email protected]>> > Subject: [Lsr] Regarding OSPFv3 VPN Domain Type > > Hi All, > > For OSPFv3 from RFC 6565, section 4.4, it is mentioned that 2-byte type field > in the attribute. > May I know what three different types 0x0005, 0x0105 0x0205 represent? > > OSPF Domain Identifier Extended Communities Attribute > > Each OSPFv3 Instance within a VRF MUST have a Domain ID. The Domain > ID is configured per OSPFv3 Instance. The OSPFv3 Domain ID is a > 6-byte number, and its default value is 0. This attribute has a > 2-byte type field, encoded with a value of 0x0005, 0x0105, or 0x0205. > > 0 1 2 3 > 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > | Type Value | Domain Identifier | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > | Domain Identifier Cont. | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > The OSPF Domain Identifier Extended Communities Attribute > > Thanks & Regards, > Rajesh > > > > _______________________________________________ > Lsr mailing list > [email protected] <mailto:[email protected]> > https://www.ietf.org/mailman/listinfo/lsr > <https://www.ietf.org/mailman/listinfo/lsr>
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