Routing

I'm trying to configure VXLAN/EVPN for the Evolved Campus Core. I'm using EX4600 switches.

I've seen in some documentation that this config is needed:

set protocols evpn default-gateway do-not-advertise

However, this does not exist on my device. I tried it in vLabs too, and it does not exist on the MX routers there either.

I've also found that some guides do not refer to this command at all.

(eg, https://www.juniper.net/documentation/en_US/release-independent/nce/topics/example/nce-172-evpn-vxlan-campus-example.html)

Can anyone tell me why this is? Is it on by default in newer versions of Junos? Or have I missed something critical?

Thanks

Hey Luke Robertson,

Greetings Sir, The default is to advertise the IRB MAC address:

        protocols {
            evpn {
                default-gateway advertise

In Junos OS Release 14.1R4 and later includes a configuration option to disable advertisement of IRB interface MAC addresses
in the EVPN control plane in cases where when the user has configured a common MAC address on the IRB interfaces of all of PE devices in an EVPN instance.

If you do not want to advertise IRB MAC, then use 'do-not-advertise' ( optional)

If this solves your problem, please mark this post as "Accepted Solution" so we can help others too \:)/

Regards,

Lil Dexx
JNCIE-ENT#863, 3X JNCIP-[SP-ENT-DC], 4X JNCIA [cloud-DevOps-Junos-Design], Champions Ingenius, SSYB

It's just that this doesn't exist at all on my switch.

Good to know its optional though

Hello Luke,

this command seems to be only available as part of a routing-instance:

{master:0}[edit]

# show protocols evpn
##
## Warning: statement ignored: unsupported platform (qfx5100-48t-6q)
##
default-gateway do-not-advertise;

{master:0}[edit]
# show routing-instances TEST
protocols {
evpn {
default-gateway do-not-advertise;
}
}

This can be seen here (page 10):

https://www.juniper.net/documentation/en_US/release-independent/solutions/information-products/pathway-pages/solutions/l3gw-vmto-evpn-vxlan-mpls.pdf

I didn't realise that! Hopefully that solves the issue, thanks.

If your device is a L3 EVPN gateway and you don't want it to advertise the default gateway associated with it as EVPN type 2 routes then you would need  'do-not-advertise' knob to be in place otherwise by default the L3 EVPN GW advertises its GW IP address as EVPN type 2 route.

It's not a compulsory knob rather used when required as mentioned above.

Hi Luke,

L3 gateway for evpn is not supported for EX 4600 on this release.

https://apps.juniper.net/feature-explorer/feature-info.html?fKey=7926&fn=Layer%203%20connectivity%20in%20an%20EVPN-VXLAN%20topology

It`s supported for these EX devices starting with these JUNOS releases.

If I'm reading this right, the EX4600 can't route between VNIs at all. Is that right?

I'm just wondering what the point of the anycast gateway is then?

Thanks