BGP neighbor stuck in 'Active' state — what does it mean?

Counter-intuitively, 'Active' state means BGP can NOT establish — it's actively trying. Compare to 'Established' which is the working state. Causes: (1) TCP port 179 blocked between peers (firewall), (2) Wrong neighbor IP configured, (3) eBGP-multihop required but not configured, (4) AS number mismatch, (5) authentication password mismatch, (6) prefix-list / route-map filtering all routes. Debug: debug ip bgp events. Check show ip bgp summary for state progression.

Want the full explanation? This is the atomic answer suitable for quick interview prep. For the structured deep-dive — including code samples, strong-answer vs weak-answer notes, common follow-up questions, and how this fits the larger cisco / network engineer topic — see the full Q&A on Networkers Home:

→ Cisco / Network Engineer Interview Hub — Full Q&A with deep context

How Networkers Home prepares students for this kind of question

This question reflects real interview rounds at Bangalore's top enterprise networking and infrastructure teams. Networkers Home's flagship courses include mock interview sessions drilling exactly these question patterns, with feedback from interviewers who have hired for the role.

→ View the complete cisco / network engineer interview prep hub
→ View the related Networkers Home course
→ Book a free career consultation

BGP neighbor stuck in 'Active' state — what does it mean?

How Networkers Home prepares students for this kind of question

Related Troubleshooting questions

Q. User reports they can't reach 8.8.8.8 from their PC — walk through troubleshooting.

Q. show ip ospf neighbor returns 'EXCHANGE' state stuck — what's wrong?