netdev - Re: recursive static routes

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Message-ID: <38e0c1a3-95e8-1917-49f3-6873ca924260@cumulusnetworks.com>
Date:   Mon, 19 Mar 2018 10:34:32 -0600
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Saku Ytti <saku@...i.fi>, netdev@...r.kernel.org
Subject: Re: recursive static routes

On 3/19/18 1:42 AM, Saku Ytti wrote:
> I believe Linux does not support recursive static routes, is this correct?

The Linux stack does not flatten routes when inserting into the FIB.
Recursion is expected to be done a routing daemon such as bgp which will
be able to handle updates as the network changes.

I have thought about adding such a feature to the stack, basically have
the gateway recomputed on link changes. It would most certainly not be
as robust as having the updates come from a routing daemon.

Any solution would need to handle encapsulations (e.g., MPLS) which is
one area it gets complicated fast.