[PATCH 3/3] babel: Add option to randomise router ID

Toke Høiland-Jørgensen toke at toke.dk
Thu May 3 17:22:31 CEST 2018

Ondrej Zajicek <santiago at crfreenet.org> writes:

> On Mon, Apr 30, 2018 at 05:15:19PM +0200, Toke Høiland-Jørgensen wrote:
>> When a Babel node restarts, it loses its sequence number, which can cause
>> its routes to be rejected by peers until the state is cleared out by other
>> nodes in the network (which can take on the order of minutes).
>> There are two ways to fix this: Having stable storage to keep the sequence
>> number across restarts, or picking a different router ID each time.
>> This implements the latter, by introducing a new option that will cause
>> Bird to pick a random router ID every time it starts up. This avoids the
>> problem at the cost of not having stable router IDs in the network.
> Merged with some minor changes (option renamed to 'randomize router id',
> no router ID change when changed during reconfiguration).
> Also note that when tested on my VM test setup, all router IDs were
> generated with the same value due to way how random() is initialized in
> BIRD. Fixed that with a further commit.

Great, thanks! :)


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