Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 55
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?
Answer options
- A. configure capability vrf-lite on Site A and its connected PE router under router ospf 1 vrf abc
- B. configure capability vrf-lite on both PE routers connected to Head Office and Site A routers under router ospf 1 vrf abc
- C. configure capability vrf-lite on Head Office and its connected PE router under router ospf 1 abc
- D. configure capability vrf-lite on Head Office and Site A routers under router ospf 1 vrf abc
Correct answer: D
Explanation
The correct answer is D because enabling capability vrf-lite on both the Head Office and Site A routers allows for proper exchange of routing information across the MPLS network, including the necessary LSAs. Options A and B only address part of the configuration and do not ensure that both routers can communicate effectively, while option C incorrectly omits Site A from the configuration.