[j-nsp] EVPN VGA MAC address learning cause flooding

[Roger Wiklund]

Hi

Yes you need to set the vga-v4/v6-mac on the IRB interface:

virtual-gateway-v4-mac | EVPN User Guide | Juniper Networks TechLibrary
<https://www.juniper.net/documentation/us/en/software/junos/evpn-vxlan/topics/ref/statement/virtual-gateway-v4-mac-edit-interfaces.html>

eg:

set interfaces irb.x virtual-gateway-v4-mac 00:00:5e:44:44:44
set interfaces irb.x virtual-gateway-v6-mac 00:00:5e:66:66:66

Regards
Roger

On Sun, Nov 21, 2021 at 12:46 PM Chen Jiang via juniper-nsp <
juniper-nsp at puck.nether.net> wrote:

> Hi! Experts
>
> Sorry for disturbing, I am curious why IRB interface in EVPN does not use
> VGAs' Virtual MAC address (00:00:5e:00:01:01)  to originate packets,  but
> instead uses the interface real MAC address to originate packets.
>
> Are there any special thoughts behind this? It will cause BUM flooding if
> peer is a layer 2 switch ( peer s will never learn VGA virtual MAC address)
>
> Thanks for your help!
>
> --
> BR!
>
>
>
>            James Chen
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