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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@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
> _______________________________________________
> juniper-nsp mailing list juniper-nsp@puck.nether.net
> https://puck.nether.net/mailman/listinfo/juniper-nsp
>
_______________________________________________
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Sorry I missed you _actual_ question :)
I never figured out why this is the default behavior, sorry.

Regards
Roger

On Tue, Dec 7, 2021 at 4:40 PM Roger Wiklund <roger.wiklund@gmail.com>
wrote:

> 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@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
>> _______________________________________________
>> juniper-nsp mailing list juniper-nsp@puck.nether.net
>> https://puck.nether.net/mailman/listinfo/juniper-nsp
>>
>
_______________________________________________
juniper-nsp mailing list juniper-nsp@puck.nether.net
https://puck.nether.net/mailman/listinfo/juniper-nsp

Interesting discussion here. I take it this is not just an issue for
packets *originated* by the switch (as in generated by the switch),
but also routed packets it forwards?

Sounds like the config posted hard-coding the MAC is a sensible thing
to do. I'm pondering now, in a situation with multiple vlans / irb
interfaces on a device, if there is any requirement to set a different
VG MAC for each one? Seems I could use, for instance, the two in the
example for every irb/vlan and not have any conflict?

thanks,

Cathal.



On Tue, 7 Dec 2021 at 15:48, Roger Wiklund via juniper-nsp
<juniper-nsp@puck.nether.net> wrote:
>
> 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@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
> > _______________________________________________
> > juniper-nsp mailing list juniper-nsp@puck.nether.net
> > https://puck.nether.net/mailman/listinfo/juniper-nsp
> >
> _______________________________________________
> juniper-nsp mailing list juniper-nsp@puck.nether.net
> https://puck.nether.net/mailman/listinfo/juniper-nsp
_______________________________________________
juniper-nsp mailing list juniper-nsp@puck.nether.net
https://puck.nether.net/mailman/listinfo/juniper-nsp