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

[Guillermo Fernando Cotone]

Hi,

To update everyone on this thread Juniper official answer is that this is
not currently supported, "standard communities cannot be carried over EVPN
type-5 advertisements". There's an internal PR (1397851) to investigate
whether this feature could be applied.

If you would like to see this feature in future releases, make sure to
contact your SEs.

Best,
Guillermo

On Fri, Jul 5, 2019 at 3:59 PM Michael Hare <michael.hare at wisc.edu> wrote:

> Hello Guillermo-
>
> I had a somewhat similar issue.  For me I was trying to add a normal bgp
> community in vrf-export to an E-VPN instance.   This config caused RPD core
> dumps in 18.2 although it worked as I had hoped in 16.1.  JTAC reported at
> the time: "... using vrf-export in EVPN instance with non-rt target is not
> yet supported. Please don’t use it until it is officially targeted at 19.4
> ... "
>
> -Michael
>
> > -----Original Message-----
> > From: juniper-nsp <juniper-nsp-bounces at puck.nether.net> On Behalf Of
> > Guillermo Fernando Cotone
> > Sent: Wednesday, July 3, 2019 4:16 AM
> > To: Alexander Arseniev <arseniev at btinternet.com>
> > Cc: Juniper List <juniper-nsp at puck.nether.net>
> > Subject: Re: [j-nsp] EVPN - BGP attribute propagation on MXes
> >
> > 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
> > >
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