Ты его в контексте vlan сконфигурил?
ну смотри
# set routing-instances sw-oam-rng routing-interface irb.1905
commit
# run show evpn instance sw-oam-rng
Intfs IRB intfs
Instance Total Up Total Up
sw-oam-rng 8 8 0 0
Total == 0
а теперь
#delete routing-instances sw-oam-rng routing-interface irb.1905
# set routing-instances sw-oam-rng l3-interface irb.1905
# commit
# run show evpn instance sw-oam-rng
Intfs IRB intfs
Instance Total Up Total Up
sw-oam-rng 8 8 1 1