# The Curious Case of Default OSPF Interface Timers

DevFeed: [The Curious Case of Default OSPF Interface Timers](<https://devfeed.tech/articles/the-curious-case-of-default-ospf-interface-timers-11285.md>)

Original publisher: [Read original article](<https://blog.ipspace.net/2025/11/ospf-interface-timers/>)

Published: 2025-11-04T06:14:00Z

Content type: article

Language: en

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

Topics: [Network](<https://devfeed.tech/topics/network.md>), [configuration](<https://devfeed.tech/topics/configuration.md>), [Logging](<https://devfeed.tech/topics/logging.md>)

Tags: [configuration](<https://devfeed.tech/tags/configuration.md>), [devices](<https://devfeed.tech/tags/devices.md>), [implementation](<https://devfeed.tech/tags/implementation.md>), [logging](<https://devfeed.tech/tags/logging.md>), [netlab](<https://devfeed.tech/tags/netlab.md>), [network](<https://devfeed.tech/tags/network.md>), [ospf](<https://devfeed.tech/tags/ospf.md>), [platform](<https://devfeed.tech/tags/platform.md>), [tests](<https://devfeed.tech/tags/tests.md>), [validation](<https://devfeed.tech/tags/validation.md>)

## AI overview

The article explains why OSPF adjacency tests can fail between FRRouting and Arista EOS when only the hello interval is configured. FRRouting derives the dead interval as four times the hello interval, while Arista EOS retains its default unless configured. It describes a netlab release 25.11 fix that calculates the missing timer value.

## Source excerpt

We run two types of integration tests before shipping a netlab release: device integration tests that check whether we correctly implemented netlab features on all supported devices, and platform integration tests that check whether rarely-used core functionality works as expected. I want to have some validation included in the platform integration tests to ensure the lab devices are started, and that the links and the management network work as expected. The simplest way to get that done is to start OSPF with short hello intervals (to get adjacency up in no time), for example: Read more ...