OpenBGPD 9.1

Routing package development team OpenBGPD released on April 13, 2026 OpenBGPD 9.1. The developers separately remind that in addition to OpenBSD, OpenBGPD-portable works on FreeBSD and Linux distributions Alpine, Debian, Fedora, RHEL/CentOS, and Ubuntu.

What's new in OpenBGPD 9.1

• outbound filter processing is accelerated by storing rules in an array and deduplicating identical filters between peers;
• error logging for attribute parsing causing session resets through UPDATE ATTRLIST error notification has been improved;
• new memory metrics for show rib memory have been added, some of which are also available in show neighbor;
• a logical error in the processing of MRT dump configurations for per-peer and per-group has been fixed.

The main focus of OpenBGPD 9.1 is not on expanding the feature set but on improving efficiency under heavy load scenarios. The outbound filters: rules are now stored in an array, and identical filters between neighbors are deduplicated. According to the project's authors, these changes together with those in the filter_set can reduce the duration of initial synchronization on large route servers by more than 25%.

Improved processing of filter_sets in the process RDE. The project has abandoned the previous scheme in favor of a linear array of set objects to reduce the number of cache misses and thus speed up the passage of routes through the filtering policy. For network operators, this essentially means a continued course toward optimizing OpenBGPD for heavy configurations and intensive BGP scenarios, where not only correctness but also predictable behavior under load is important.

Another notable change concerns observability. In OpenBGPD 9.1, new memory metrics, available via the show rib memory command; some of this data is now also tracked by neighbors and displayed via show neighbor. At the same time, error logging for attribute parsing that can lead to BGP session resets with notification UPDATE ATTRLIST error. This makes diagnosing issues with sessions and routes more transparent.

Avots: linux.org.ru