4A0-115: Nokia Ethernet Virtual Private Network Services

In the interface-ful unnumbered EVPN-IRB model, EVPN Type-5 (IP-Prefix) routes are advertised under the route target(s) of the Layer-3 IP-VRF (VPRN) service, carrying the advertising PE's own IRB MAC address as the overlay index. However, the EVPN Type-2 MAC/IP route needed to resolve that MAC overlay index is generated and exported by the Layer-2 bridging instance (the R-VPLS/EVI) to which the IRB is bound — in this topology, R-VPLS 20 on PE1 — using that bridge instance's own configured route target, not the route target configured on VPRN 15. Therefore the claim that PE1's MAC route advertisement for MAC-01 carries the route target configured for VPRN 15 is incorrect, since the Layer-2 EVI and the Layer-3 VPRN are distinct services with independent route-target configuration.