mediumMultiple Select
300-410 Practice Question: Which TWO commands can be used to troubleshoot…
Which TWO commands can be used to troubleshoot EIGRP route redistribution issues when routes are not appearing in the routing table? (Choose TWO.)
⚠ Common exam trap
Cisco often tests the distinction between 'show ip eigrp topology' and 'show ip eigrp topology all-links', where the latter is necessary to see all routes, including those not selected as best paths, which is critical for troubleshooting redistribution failures.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
show ip protocols
Option A, 'show ip protocols', is correct because it displays the configured routing protocols, their redistribution settings (including which protocols are redistributed into EIGRP and the associated metrics), and the networks being advertised, allowing you to verify that redistribution is properly configured. Option C, 'show ip eigrp topology all-links', is correct because it shows all EIGRP topology entries, including feasible successors and routes that are not installed in the routing table, helping you determine whether redistributed routes are present in the EIGRP topology database but failing to meet feasibility or administrative distance requirements. Option B, 'show ip route', only shows the final routing table and cannot reveal whether redistribution or EIGRP topology processing is the root cause. Option D, 'show ip ospf database', is irrelevant because the issue concerns EIGRP, not OSPF. Option E, 'debug ip routing', can show routing table changes but does not specifically verify EIGRP redistribution configuration or topology entries, making it less targeted for this troubleshooting scenario.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
show ip protocols
Why this is correct
show ip protocols displays the active redistribution sources, seed metrics, and administrative distance applied per routing protocol, exposing misconfigured redistribute statements or missing metric parameters that prevent EIGRP from installing redistributed routes into the routing table.
- ✗
show ip route
Why it's wrong here
show ip route displays the routing table but cannot reveal why redistribution failed, such as missing seed metrics or route maps. It is tempting because it confirms whether routes appeared, yet diagnostic commands like show ip protocols expose the redistribution configuration itself.
- ✓
show ip eigrp topology all-links
Why this is correct
`show ip eigrp topology all-links` exposes every EIGRP topology entry, including passive and unreachable successors that the standard topology output hides. This reveals whether redistributed routes entered the EIGRP topology table at all, isolating a redistribution filter or seed-metric failure from a later routing-table installation problem.
- ✗
show ip ospf database
Why it's wrong here
OSPF's link-state database holds only OSPF LSAs, so it cannot reveal EIGRP topology entries or redistribution into EIGRP. It is tempting because it verifies OSPF adjacencies and prefixes when troubleshooting OSPF redistribution, but this scenario concerns EIGRP.
- ✗
debug ip routing
Why it's wrong here
Debug ip routing logs routing table insertions and deletions, not why EIGRP redistribution failed to produce a route. It is tempting because it confirms whether a prefix actually enters the RIB, which suits verifying route installation generally rather than diagnosing redistribution filtering.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
Go deeper
Related to this question
Learn chapter
BGP Route Selection and Policy
Key term
Route Redistribution Between Protocols
Route redistribution between protocols is the process of taking routes learned from one routing protocol and injecting them into another routing protocol so that networks using different protocols can communicate.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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