[j-nsp] EVPN - BGP attribute propagation on MXes

[Guillermo Fernando Cotone]

Hi Alexander,

Not really.
BGP route propagation works and some attributes are preserved, e.g. as-path
and local-preference, but not the attached communities.
It looks like they are doing implicitly —in juniper syntax— "then community
*set* EVPN-EXT-COMM" instead of "*add*" while importing BGP routes into EVPN
.

Best,
Guillermo

On Wed, Jul 3, 2019 at 10:55 AM Alexander Arseniev <arseniev at btinternet.com>
wrote:

> Hello,
> On 01/07/2019 15:38, Guillermo Fernando Cotone wrote:
>
> Our use-case is to connect BGP islands through an EVPN backbone, and we
> expect BGP attributes, such as communities, to be propagated over the
> backbone. Pretty much standard IP-VPN behavior. Also referenced here:https://tools.ietf.org/html/draft-rabadan-sajassi-bess-evpn-ipvpn-interworking-02#section-4.2
>
> I'm not sure if this is actually supported on Juniper. We're
> running 17.3R3-S2.2.
>
> Are You terminating PE-CE BGP on IRB interface on PE side? This is
> supported from  19.2R1
>
>
> https://www.juniper.net/documentation/en_US/junos/information-products/topic-collections/release-notes/19.2/jd0e4828.html#jd0e4903
>
> Thanks
>
> Alex
>