netdev - Re: [patch net-next 12/15] ipv4: fib: Notify about nexthop status changes

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Message-ID: <a21e02bf-e146-6a02-d1cc-229be629dcb0@cumulusnetworks.com>
Date:   Wed, 8 Feb 2017 11:05:54 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Ido Schimmel <idosch@...lanox.com>,
        Andy Gospodarek <andy@...yhouse.net>
Cc:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org,
        davem@...emloft.net, eladr@...lanox.com, mlxsw@...lanox.com,
        Roopa Prabhu <roopa@...ulusnetworks.com>
Subject: Re: [patch net-next 12/15] ipv4: fib: Notify about nexthop status
 changes

On 2/8/17 8:32 AM, Ido Schimmel wrote:
> In the case of multipath routes, if some of the nexthops can be
> reflected, then we do so, but periodically ask the kernel to try and
> resolve the others. Otherwise, these nexthops will never be resolved, as
> the kernel doesn't see the packets hitting the multipath route and
> therefore lacks the motivation to resolve its nexthops.

It should get the motivation once the neigh entry is cleaned up. That
can take a long time based on gc settings, but it can also happen from
the remote side if it sends an arp message.