350-601 Network Practice Question
A data center runs OSPF as the underlay for an EVPN-VXLAN fabric. The fabric includes two spine switches and eight leaf switches. After adding a new leaf switch, the network team notices that some EVPN routes are missing from the other leaves. The new leaf has established BGP EVPN sessions to both spines and the BGP sessions are up. The spines report receiving all routes from the new leaf, but the other leaves do not receive certain prefixes. The engineer checks the BGP configuration on the new leaf and sees the address-family l2vpn evpn is configured under router bgp. Which action should the engineer take to resolve the issue?
⚠ Common exam trap
Cisco often tests the distinction between configuring the address-family globally under router bgp versus activating it under a specific neighbor, leading candidates to assume global configuration is sufficient.
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
✓
Verify the new leaf has the address-family l2vpn evpn activated under the neighbor configuration
The issue is that the new leaf has BGP EVPN sessions to both spines, but other leaves do not receive certain prefixes. Since the spines (acting as route reflectors) receive all routes from the new leaf but do not propagate them to other leaves, the most likely cause is that the address-family l2vpn evpn is not activated under the neighbor configuration on the new leaf. Without this activation, the new leaf does not advertise its EVPN routes to the spines, even though the BGP session is up and the address-family is configured globally under router bgp.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Check the new leaf's BGP router ID for uniqueness
Why it's wrong here
Duplicate router ID would cause warnings but not missing routes.
- ✓
Verify the new leaf has the address-family l2vpn evpn activated under the neighbor configuration
Why this is correct
The address-family must be activated under each neighbor to advertise routes.
- ✗
Ensure the new leaf's BGP next-hop-self is enabled
Why it's wrong here
Next-hop-self is typically applied on route reflectors, not leaves.
- ✗
Verify the cluster ID on the route reflectors is consistent
Why it's wrong here
Cluster ID mismatch does not affect route exchange when sessions are up.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-601 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-601 exam.