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300-410 Practice Question: R1 and R2 are EIGRP neighbors with BFD enabled
R1 and R2 are EIGRP neighbors with BFD enabled. R1#show ip eigrp neighbors shows R2 in state 'Init' for BFD. R1#show bfd neighbors shows the session as 'Up'. R2#show bfd neighbors shows the session as 'Up'. R1 has 'eigrp stub' configured. R2 does not. What is the root cause?
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
✓
The EIGRP stub configuration on R1 prevents full adjacency, but BFD is unaffected.
EIGRP stub routers can form BFD sessions but the EIGRP adjacency may remain in Init state if the stub router is not configured correctly. However, BFD session is up, so the issue is with EIGRP itself. The stub router may be blocking queries, but that does not affect BFD. The real issue is that R1 has 'eigrp stub' but is missing the 'receive-only' keyword, causing it to not advertise routes, but BFD is fine. The BFD session is up, so the problem is EIGRP, not BFD.
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 EIGRP stub configuration on R1 prevents full adjacency, but BFD is unaffected.
Why this is correct
EIGRP stub does not affect BFD; the BFD session is up, but EIGRP adjacency is in Init due to stub behavior.
- ✗
BFD requires 'eigrp stub' to be removed.
Why it's wrong here
BFD works with EIGRP stub.
- ✗
The BFD interval on R1 is too low for EIGRP.
Why it's wrong here
BFD session is up, so interval is fine.
- ✗
EIGRP must be configured with 'no eigrp stub' for BFD to work.
Why it's wrong here
BFD works regardless of stub.
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.
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Last reviewed: Jun 18, 2026
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