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Re: I-D Action: draft-linkova-6man-default-addr-selection-update-00.txt

Lorenzo Colitti <lorenzo@google.com> Fri, 07 April 2017 15:12 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Sat, 08 Apr 2017 00:12:06 +0900
Message-ID: <CAKD1Yr1UyAafXtQ3DythK9HhJfnOiZ6FGc1hFYUTRe74oyW+9w@mail.gmail.com>
Subject: Re: I-D Action: draft-linkova-6man-default-addr-selection-update-00.txt
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
Cc: Erik Kline <ek@google.com>, Jen Linkova <furry13@gmail.com>, 6man <ipv6@ietf.org>
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On Fri, Apr 7, 2017 at 11:59 PM, Brian E Carpenter <
brian.e.carpenter@gmail.com> wrote:

> > How do you configure RFC7217 such that the two VRRP routers in a given
> pair
> > have the same link-local address, but other routers don't?
>
> I'm totally ignorant about how VRRP setups are created, so I can't answer
> that.
>

This problem isn't really specific to VRRP, it's specific to 7217. The
determinism in 7217 is obtained by running a hash function over a set of
configuration variable. To use it for this purpose you have to ensure that
all the configuration variables are the same for a given pair.

If you want different VRRP groups to have different 7217 addresses then you
need additional entropy. The VRRP group is still only 8 bits long, and the
list of parameters in 7217 doesn't leave much room to maneuver...

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