Quick Answer
The answer is that a route-map is filtering the route 10.30.30.0/24 from the VRF routing table. This conclusion is drawn from the discrepancy between the BGP table and the VRF routing table: the BGP table for VRF CUSTOMER_A shows three learned prefixes (10.10.10.0/24, 10.20.20.0/24, and 10.30.30.0/24), yet the VRF routing table only contains two. Since BGP installs routes into the VRF RIB only if they pass any configured inbound route-map filtering, the missing route indicates that a route-map applied to the VRF’s BGP neighbor or address-family is explicitly denying 10.30.30.0/24. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to correlate show ip route vrf and show ip bgp vpnv4 vrf outputs to isolate filtering issues—a common trap is assuming a routing protocol problem when the real culprit is a route-map. Remember the memory tip: “RIB vs. BGP table mismatch? Check the route-map catch.”
This 300-410 practice question tests your understanding of route maps and route filtering. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer runs the following command on Router R1:
R1# show ip route vrf CUSTOMER_A
Routing Table: CUSTOMER_A Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP a - application route + - replicated route, % - next hop override
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks B 10.10.10.0/24 [200/0] via 192.168.1.2, 00:10:00 B 10.20.20.0/24 [200/0] via 192.168.1.2, 00:10:00 R1# show ip bgp vpnv4 vrf CUSTOMER_A
BGP table version is 6, local router ID is 10.1.1.1 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path Route Distinguisher: 100:1 (default for vrf CUSTOMER_A) *> 10.10.10.0/24 192.168.1.2 0 0 65001 i *> 10.20.20.0/24 192.168.1.2 0 0 65001 i *> 10.30.30.0/24 192.168.1.2 0 0 65001 i
Based on this output, what is the likely issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
A route-map is filtering the route 10.30.30.0/24 from the VRF routing table.
BGP table has three routes, but routing table only has two, indicating filtering.
The VRF is not properly configured.
Why wrong: The VRF is configured and has routes.
The BGP session is down.
Why wrong: Routes are present in BGP table.
The route distinguisher is misconfigured.
Why wrong: Route distinguisher 100:1 is consistent.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
A route-map is filtering the route 10.30.30.0/24 from the VRF routing table.
The VRF routing table shows only two routes, but the BGP table shows three routes for the VRF. This indicates that a route-map is filtering one of the routes from being installed in the routing table. The correct answer is that a route-map is filtering the route 10.30.30.0/24.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
A route-map is filtering the route 10.30.30.0/24 from the VRF routing table.
The VRF is not properly configured.
Why it's wrong here
The VRF is configured and has routes.
The BGP session is down.
Why it's wrong here
Routes are present in BGP table.
The route distinguisher is misconfigured.
Why it's wrong here
Route distinguisher 100:1 is consistent.
Common exam traps
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
Route Maps and Route Filtering — study guide chapter
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FAQ
Route Maps and Route Filtering — This question tests Route Maps and Route Filtering — OSPF neighbours must agree on key parameters..
The correct answer is: A route-map is filtering the route 10.30.30.0/24 from the VRF routing table. — The VRF routing table shows only two routes, but the BGP table shows three routes for the VRF. This indicates that a route-map is filtering one of the routes from being installed in the routing table. The correct answer is that a route-map is filtering the route 10.30.30.0/24.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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