[a-nsp] Arista and EVPN-VPWS, RFC 8214

[Gert Doering]

Hi,

On Thu, Nov 07, 2019 at 06:08:46PM +0100, Joris Claassen wrote:
> As no-one else chimed in before, let me do so - even though I am a bit late.

Thanks :-)

[..]
> As per version 4.22.0F Arista also supports Layer 2 Control Plane
> Forwarding on a selection of platforms (7020, 7280 and 7500 series). 
[..]
> https://eos.arista.com/eos-4-22-0f/l2-protocol-forwarding/

Are the other platforms not supported "because implementations has
not been done yet" or because there is a fundamental incompatibility
with the switch chips used?  (We use mostly T2+/T3 based boxes for 
the customer connections, that is, 7050SX2 and 7050SX3).

> MAC learning can be turned off on a per-port basis, as per the manual:
> 
> https://www.arista.com/en/um-eos/eos-section-19-3-mac-address-table
> 
> This combination of features will:
> 
>    - Use EVPN to fill the flood-lists on the respective VTEPs that host the
>    endpoints of your VPWS service
>    - Forward tagged/untagged/all type PAUSE/LACP/LLDP/MACSEC/STP frames
>    through the VXLAN tunnel
>    - Not learn endpoint MAC addresses on the ethernet ports that you would
>    map to the VPWS service
>    - All the traffic will be transparently sent to the other side as the
>    MAC address will not be learned

Ignoring L2 protocol forwarding for the moment, I'm a bit confused on
how to implement the VPWS part.  Is it just an EVPN L2 VPN with "just two
member devices", and the rest happens quasi automatically, because "without
learning, all you can do is flooding, and if you only have two endpoints,
this is a point-to-point pseudowire"?

gert
-- 
"If was one thing all people took for granted, was conviction that if you 
 feed honest figures into a computer, honest figures come out. Never doubted 
 it myself till I met a computer with a sense of humor."
                             Robert A. Heinlein, The Moon is a Harsh Mistress

Gert Doering - Munich, Germany                             gert at greenie.muc.de
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