netdev - Re: IPv6 addr and route is gone after adding port to vrf (5.2.0+)

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Date:   Fri, 16 Aug 2019 15:48:59 -0600
From:   David Ahern <dsahern@...il.com>
To:     Ben Greear <greearb@...delatech.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: IPv6 addr and route is gone after adding port to vrf (5.2.0+)

On 8/16/19 3:28 PM, Ben Greear wrote:
> On 8/16/19 12:15 PM, David Ahern wrote:
>> On 8/16/19 1:13 PM, Ben Greear wrote:
>>> I have a problem with a VETH port when setting up a somewhat complicated
>>> VRF setup. I am loosing the global IPv6 addr, and also the route,
>>> apparently
>>> when I add the veth device to a vrf.  From my script's output:
>>
>> Either enslave the device before adding the address or enable the
>> retention of addresses:
>>
>> sysctl -q -w net.ipv6.conf.all.keep_addr_on_down=1
>>
> 
> Thanks, I added it to the vrf first just in case some other logic was
> expecting the routes to go away on network down.
> 
> That part now seems to be working.
> 

The down-up cycling is done on purpose - to clear out neigh entries and
routes associated with the device under the old VRF. All entries must be
created with the device in the new VRF.