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
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.
Hope this helps,
Acee
From: Lsr <[email protected]> on behalf of Rajesh M <[email protected]>
Date: Friday, September 17, 2021 at 5:44 AM
To: "[email protected]" <[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]
https://www.ietf.org/mailman/listinfo/lsr
