Horton

Re: macaddr 64 bit (EUI-64) datatype support

Julien Rouhaud <julien.rouhaud@dalibo.com>

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From: Julien Rouhaud <julien.rouhaud@dalibo.com>
To: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Craig Ringer <craig@2ndquadrant.com>, Haribabu Kommi <kommi.haribabu@gmail.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Date: 2016-10-12T12:50:51Z
Lists: pgsql-hackers 
On 12/10/2016 14:32, Alvaro Herrera wrote:
> Julien Rouhaud wrote:
> 
>> and you can instead make macaddr64 support both format, and provide a
>> macaddr::macaddr64 cast
> 
> Having macaddr64 support both formats sounds nice, but how does it work?
> Will we have to reserve one additional bit to select the representation?
> That would make the type be 65 bits which is a clear loser IMO.
> 
> Is it allowed to just leave 16 bits as zeroes which would indicate that
> the address is EUI48?  I wouldn't think so ...
> 

From what I read, you can indicate it's an EUI-48 address by storing
FF:FF (or FF:FE for MAC-48) in 4th and 5th bytes of the EUI-64 address.

-- 
Julien Rouhaud
http://dalibo.com - http://dalibo.org

Commits

  1. Add support for EUI-64 MAC addresses as macaddr8

  2. perltidy pg_dump TAP tests