# Cisco IOS IPv6 documentation incorrectly described automatic OSPFv3 router ID selection

DevFeed: [Cisco IOS IPv6 documentation incorrectly described automatic OSPFv3 router ID selection](<https://devfeed.tech/articles/omg-automatic-ospfv3-router-id-on-cisco-ios-11266.md>)

Original publisher: [Read original article](<https://blog.ipspace.net/2025/10/ospf-automatic-router-id/>)

Published: 2025-10-28T06:52:00Z

Content type: opinion

Language: en

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

Topics: [Cisco](<https://devfeed.tech/topics/cisco.md>), [networking](<https://devfeed.tech/topics/networking.md>), [Routing (disambiguation)](<https://devfeed.tech/topics/routing.md>), [Documentation](<https://devfeed.tech/topics/documentation.md>), [OpenAI](<https://devfeed.tech/topics/openai.md>)

Tags: [automatic](<https://devfeed.tech/tags/automatic.md>), [cisco](<https://devfeed.tech/tags/cisco.md>), [documentation](<https://devfeed.tech/tags/documentation.md>), [ipv6](<https://devfeed.tech/tags/ipv6.md>), [opinion](<https://devfeed.tech/tags/opinion.md>), [ospf](<https://devfeed.tech/tags/ospf.md>), [router](<https://devfeed.tech/tags/router.md>)

## AI overview

The article criticizes inaccurate Cisco IOS IPv6 documentation about OSPFv3 router ID selection. It explains that the OSPFv3 process does not start without an IPv4 address or a configured router ID, and notes that Cisco later corrected the documentation.

## Source excerpt

Found this incredible gem1 hidden in the Usage Guidelines for the OSPFv3 router-id configuration command part of the Cisco IOS IPv6 reference guide. The whole paragraph seems hallucinated2, but that couldn't be because the page was supposedly last updated in 2019, and LLMs weren't good enough to write well-structured nonsense at that time: 2026-04-14: The router-id description in the Cisco IOS IPv6 Reference Guide has been fixed. Thank you! It's so nice to see we can make the world a better place (one snark at a time). Read more ...