netdev - Re: iproute2 invalid argument mpls labels

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Date:   Tue, 15 Aug 2017 08:06:14 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Алексей Болдырев 
        <devel-net-ne-vlezay80@...dex.ru>
Cc:     netdev <netdev@...r.kernel.org>
Subject: Re: iproute2 invalid argument mpls labels

On Tue, 15 Aug 2017 11:17:27 +0300
Алексей Болдырев         <devel-net-ne-vlezay80@...dex.ru> wrote:

> I updated the kernel 4.12.6. When the mote is hung on the route more than 8 mpls of marks through iproute2, I get the following:
> 
> root@...vlezay80:~# ip route add 10.10.10.0/24 encap mpls 50/60/70/80/90/100/110/120/130 dev lo
> RTNETLINK answers: Invalid argument
> 
> root@...vlezay80:~# ip route add 10.10.10.0/24 encap mpls 50/60/70/80/90/100/110/120 dev lo
> root@...vlezay80:~#
> 
> root@...vlezay80:~# ip r
> default via 10.247.0.1 dev ic-br0 proto zebra metric 20 
> 10.10.10.0/24  encap mpls  ///////120 dev lo scope link 
> 
> root@...vlezay80:~# cat /usr/src/linux-4.12.6/net/mpls/internal.h|grep MAX_NEW
> #define MAX_NEW_LABELS 30
> root@...vlezay80:~# 
> 
> What is the problem, and how can more than 8 MPLS markers be hung on through iproute2?
> 
> root@...vlezay80:~# uname -r
> 4.12.6
> root@...vlezay80:~# 

iproute2 just reports what the kernel response is. The invalid argument error 
comes from the kernel.