The answer is the high delay metric triggering EIGRP’s feasibility condition, which suppresses the route from the routing table. When redistributing OSPF into EIGRP with the command `redistribute ospf 1 metric 10000 100 255 1 1500`, the metric components are set in the order bandwidth, delay, reliability, load, and MTU, making the delay value 10,000 tens of microseconds—an extremely inflated 100,000 microseconds. This artificially high delay drastically increases the composite metric, creating a very large feasible distance (FD) on the redistributing router. When that route is advertised to a neighbor, the neighbor’s reported distance (RD) may equal or exceed its own FD for that route, violating the EIGRP feasibility condition (RD < FD) and causing the route to be suppressed as a loop-prevention mechanism. On the Cisco CCNP ENARSI 300-410 exam, this tests your understanding of how redistribution metric components directly impact EIGRP’s Diffusing Update Algorithm (DUAL) and the common trap of assuming any metric works without considering feasibility. Remember the mnemonic “Big Delay Breaks Feasibility”—if the delay is too high, the route won’t fly.
300-410 IPv4 Access Control Lists Practice Question
This 300-410 practice question tests your understanding of ipv4 access control lists. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 redistributes OSPF into EIGRP. Router R1 has: redistribute ospf 1 metric 10000 100 255 1 1500. Router R2 shows: show ip route eigrp includes some OSPF routes but not 192.168.1.0/24. What is the root cause?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The high delay metric (10000) may cause the route to be suppressed by EIGRP's feasibility condition.
C is correct because EIGRP uses a feasibility condition to prevent routing loops, which requires that the reported distance (RD) from a neighbor be strictly less than the feasible distance (FD). The redistribute command sets the EIGRP metric components in the order bandwidth, delay, reliability, load, MTU. Here, the delay is set to 10000 tens of microseconds, which is extremely high (100,000 microseconds). This high delay inflates the composite metric, making the FD very large. When this route is advertised to an EIGRP neighbor, the neighbor's RD may equal or exceed its own FD for that route, violating the feasibility condition and causing the route to be suppressed from the routing table.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The OSPF route 192.168.1.0/24 is not in the OSPF database.
Why it's wrong here
If it were missing, no redistribution would occur; the issue is metric-related.
✗
The EIGRP metric components are misordered; delay should be 100, not 10000.
Why it's wrong here
The order is correct: bandwidth, delay, reliability, load, MTU.
✓
The high delay metric (10000) may cause the route to be suppressed by EIGRP's feasibility condition.
Why this is correct
EIGRP uses composite metric; high delay can make the route less feasible, preventing installation.
Related concept
Read the scenario before looking for a memorised answer.
✗
Redistribution requires a route-map to filter specific routes.
Why it's wrong here
Redistribution without route-map still redistributes all OSPF routes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the EIGRP feasibility condition by hiding it behind a metric misconfiguration—candidates mistakenly think the metric values are simply wrong or misordered, when the real issue is that the high delay causes the route to be suppressed by EIGRP's loop-prevention mechanism.
Detailed technical explanation
How to think about this question
EIGRP's feasibility condition is defined in RFC 7868 and ensures loop-free paths by requiring that the reported distance (RD) from a neighbor be less than the feasible distance (FD) for the route. The composite metric is calculated using K-values (default K1=1, K3=1, others=0) as: metric = (bandwidth + delay) * 256, where bandwidth = (10^7 / minimum bandwidth in kbps) * 256 and delay = (sum of delays in tens of microseconds) * 256. A delay of 10000 tens of microseconds (100,000 microseconds) adds 2,560,000 to the metric, which can easily cause the FD to be so high that the route fails the feasibility condition on the receiving router, especially if the receiving router has a lower FD from another path or from a directly connected route. In real-world scenarios, misconfigured redistribution metrics are a common cause of missing routes in EIGRP, particularly when the delay is set too high without considering the impact on the feasibility condition.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
IPv4 Access Control Lists — This question tests IPv4 Access Control Lists — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The high delay metric (10000) may cause the route to be suppressed by EIGRP's feasibility condition. — C is correct because EIGRP uses a feasibility condition to prevent routing loops, which requires that the reported distance (RD) from a neighbor be strictly less than the feasible distance (FD). The redistribute command sets the EIGRP metric components in the order bandwidth, delay, reliability, load, MTU. Here, the delay is set to 10000 tens of microseconds, which is extremely high (100,000 microseconds). This high delay inflates the composite metric, making the FD very large. When this route is advertised to an EIGRP neighbor, the neighbor's RD may equal or exceed its own FD for that route, violating the feasibility condition and causing the route to be suppressed from the routing table.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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