netdev - Re: Unable to add v6 multipath route with same nexthops but different MPLS labels

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Message-ID: <73b4cf4b-4e65-3bc0-15c8-8a50ff6e4bdc@gmail.com>
Date:   Wed, 5 Jul 2017 11:15:58 -0600
From:   David Ahern <dsahern@...il.com>
To:     Lennert Buytenhek <buytenh@...tstofly.org>,
        David Ahern <dsa@...ulusnetworks.com>,
        Robert Shearman <rshearma@...cade.com>,
        Roopa Prabhu <roopa@...ulusnetworks.com>
Cc:     netdev@...r.kernel.org
Subject: Re: Unable to add v6 multipath route with same nexthops but different
 MPLS labels

On 7/5/17 9:39 AM, Lennert Buytenhek wrote:
> Hi!
> 
> FWIW, this doesn't work:
> 
> 	# ip -6 route add 1234::/16 \
> 		nexthop encap mpls 10 via fe80::1 dev ens3 \
> 		nexthop encap mpls 20 via fe80::1 dev ens3
> 	RTNETLINK answers: File exists
> 
> While this does:
> 
> 	# ip -6 route chg 1234::/16
> 		nexthop encap mpls 10 via fe80::1 dev ens3
> 		nexthop encap mpls 20 via fe80::2 dev ens3
> 	# ip -6 route
> 	1234::/16  encap mpls  10 via fe80::1 dev ens3 metric 1024 pref medium
> 	1234::/16  encap mpls  20 via fe80::2 dev ens3 metric 1024 pref medium
> 	[...]
> 
> ECMPing over different LSPs that share a nexthop router seems like a
> legitimate use case to me.  Is this restriction intentional or just an
> accident?  (The same thing works fine in v4 land, where multipath
> routes are handled differently.)
> 
> Thanks in advance!


Seems like a failure to compare lwt state. Will send a patch.