[dev] VRF support with netns

[Vincent Jardin]

Le 21 avril 2017 9:35:38 PM Igor Ryzhov <iryzhov at nfware.com> a écrit :

> Hello Philippe!
>
> Do you see any advantages of netns-base VRF implementation besides that it
> can work on older kernels?

There are some legacy systems which are deployed with netns based VRF.


>
> Best regards,
> Igor
>
> On Fri, Apr 21, 2017 at 4:37 PM, Philippe Guibert <
> philippe.guibert at 6wind.com> wrote:
>
>> Hi all,
>>
>> About VRF support of frrouting 2.0, regarding [0], the following is
>> indicated:
>> - VRF Lite (Linux VRF device support, Zebra and BGP) Instructions ([1])
>>
>> This is good information that VRF lite is now supported in frrouting.
>> However, I would like to draw your attention to the following:
>> * the VRF feature in frrouting is lost for kernels not supporting [1],
>> whereas it was working on Quagga.
>> * it is not possible to rely on kernel netns, whereas in Quagga the
>> netns solution was used.
>> An issue has been created for that in [4].
>>
>> On behalf of 6WIND, we want to fix those two issues, but would like to
>> ensure that the proposed solution is aligned, and does not conflict
>> with frrouting/other roadmap.
>>
>> Code investigation in frrouting showed the following :
>> - The netns support has been moved to a lib/netns libary ( see commit
>> illustration in [2]). This change made useless the ns support )
>> - The VRF support has been mapped to vrf kernel feature ( as
>> illustrated in [3], file lib/vrf.h)
>>
>> The most obvious solution is the following.
>> It consists in configuring at runtime frrouting, so that the frrouting
>> VRF mecanism will rely either on VRF or on Netns feature.
>>
>> The fact is the clients that have a quagga based solution, would like
>> to benefit for frrouting, without having to change their
>> configuration. Either because the kernel is not yet up to date, or
>> because this is not part of their plan to move to vrf kernel
>> implementation. Like that, the user will be able to choose with a
>> minimum configuration change to be on VRF mode or on Netns mode.
>>
>> Any remarks about the proposal to solve [4] ?
>>
>> Best Regards,
>>
>> Philippe
>>
>> [0] https://github.com/FRRouting/frr/wiki/Quagga-1.1-%E2%86%92-FRR-2.0
>> [1] https://www.kernel.org/doc/Documentation/networking/vrf.txt
>> [2] https://github.com/FRRouting/frr/commit/13460c44a2241
>> [3] https://github.com/FRRouting/frr/commit/216b18efe144b
>> [4] https://github.com/FRRouting/frr/issues/385
>>
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>
>
>
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