# Passive BGP Sessions

DevFeed: [Passive BGP Sessions](<https://devfeed.tech/articles/passive-bgp-sessions-11148.md>)

Original publisher: [Read original article](<https://blog.ipspace.net/2025/03/bgp-labs-passive-sessions/>)

Published: 2025-03-28T05:40:00Z

Content type: tutorial

Language: en

Sources: [ipSpace.net blog](<https://devfeed.tech/sources/ipspace-net-blog.md>)

Topics: [BGP](<https://devfeed.tech/topics/bgp.md>), [Server](<https://devfeed.tech/topics/server.md>), [GitHub](<https://devfeed.tech/topics/github.md>)

Tags: [bgp](<https://devfeed.tech/tags/bgp.md>), [browser](<https://devfeed.tech/tags/browser.md>), [github](<https://devfeed.tech/tags/github.md>), [netlab](<https://devfeed.tech/tags/netlab.md>), [server](<https://devfeed.tech/tags/server.md>)

## AI overview

A lab exercise introducing passive BGP sessions, where a route reflector or route server defines BGP neighbors without repeatedly attempting sessions with unreachable peers. The lab can be launched in GitHub Codespaces or set up locally with netlab.

## Source excerpt

The Dynamic BGP Peers lab exercise gave you the opportunity to build a large-scale environment in which routers having an approved source IP addresses (usually matching an ACL/prefix list) can connect to a BGP route reflector or route server. In a more controlled environment, you'd want to define BGP neighbors on the BGP RR/RS but not waste CPU cycles trying to establish BGP sessions with unreachable neighbors. Welcome to the world of passive BGP sessions. Read more ...