# Cisco IOS/XE Hates Redistributed Static IPv6 Routes

DevFeed: [Cisco IOS/XE Hates Redistributed Static IPv6 Routes](<https://devfeed.tech/articles/cisco-ios-xe-hates-redistributed-static-ipv6-routes-11213.md>)

Original publisher: [Read original article](<https://blog.ipspace.net/2025/07/cisco-iosxe-hates-redistributed-ipv6-bgp/>)

Published: 2025-07-18T05:41:00Z

Content type: article

Language: en

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

Topics: [Cisco](<https://devfeed.tech/topics/cisco.md>), [BGP](<https://devfeed.tech/topics/bgp.md>), [networking](<https://devfeed.tech/topics/networking.md>), [IP routing](<https://devfeed.tech/topics/ip-routing.md>)

Tags: [bgp](<https://devfeed.tech/tags/bgp.md>), [cisco](<https://devfeed.tech/tags/cisco.md>), [ipv6](<https://devfeed.tech/tags/ipv6.md>), [netlab](<https://devfeed.tech/tags/netlab.md>), [network](<https://devfeed.tech/tags/network.md>), [ospf](<https://devfeed.tech/tags/ospf.md>), [router](<https://devfeed.tech/tags/router.md>), [routing](<https://devfeed.tech/tags/routing.md>), [tests](<https://devfeed.tech/tags/tests.md>)

## AI overview

The article examines the difficulty of testing network device configuration, focusing on route redistribution into BGP on Cisco IOS/XE. It reports that OSPF routes were redistributed successfully, while adding static routes exposed unexpected behavior and timing assumptions.

## Source excerpt

Writing tests that check the correctness of network device configurations is hard (overview, more details). It's also an interesting exercise in getting the timing just right: Routing protocols are an eventually-consistent distributed system, and things eventually appear in the right place (if you got the configurations right), but you never know when exactly that will happen. You can therefore set some reasonable upper bounds on when things should happen, and declare failure if the timeouts are exceeded. Even then, you'll get false positives (as in: the test is telling you the configurations are incorrect, when it's just a device having a bad hair day). And just when you think you nailed it, you encounter a device that blows your assumptions out of the water. Read more ...