I have an MPLS-EVPN infrastructure with 2x MX960 and 2x EX9200.
On 1 device i have an active interface with gateway, on the other 3 the VLAN is extended and the irb interface added to the VRF/EVPN. However; There is no configuration on the interface except for a description or a static mac address.
Today i discovered the hard way that putting an interface in an VRF/EVPN VLAN means that traffic can flow.
Configuration looking like so;
set routing-instances HOSTING-EVPN bridge-domains VL833-Colo_Test routing-interface irb.833; set routing-instances HOSTING-VRF interface irb.833;
set interfaces irb unit 833 family inet set interfaces irb unit 833 mac 00:00:00:00:00:01
After i did this, i noticed internet traffic flowing in through this interface.
Router does not know global ARP:
show arp | match x.x.x.100
Router does know EVPN route:
username@pe01-re0> show route table HOSTING-EVPN | match x.x.x.100 2:x.x.x.4:14::833::00:0c:29:02:60:7d::x.x.x.100/304
This is not behaviour what i expected. Is this expected? If so; Why?