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An engineer configured a company's multiple area OSPF Head Office router and Site A Cisco routers with VRF lite. Each site router is connected to a PE router of an MPLS backbone: Head Office & Site A - ip cef ip vrf abc rd 101:101 ! interface FastEthernet0/0 ip vrf forwarding abc ip address 172.16.16.X 255.255.255.252 ! router ospf 1 vrf abc log-adjacency-changes network 172.16.16.0 0.0.0.255 area 1 After finishing both site router configurations, none of the LSA 3, 4, 5, and 7 are installed at Site A router. Which configuration resolves this issue?
Correct Answer: D
In this case both Head Office and Site A routers run VRF (and OSPF) although they are CE routers. So we must configure "capability vrf-lite" on them too. For your information, the capability vrf-lite command disables the DN-bit (down bit) and domain- tag checks in OSPF. Since the CE router acts as the PE router in VRF-lite, these checks should be disabled, because the PE routers advertise VPN routes with DN-bit set to the CE routers. If the CE routers receive routes with DN-bit set, it will discard them. Hence, the checks should be disabled.