We have discovered that one of our internal BGP filters is incorrectly configured. We are currently reviewing all filters to ensure this is only limited to 1 instance. Once the review is complete we will be taking steps to correct the configuration issues found. This will result in routing table changes and disruption to various services.
We apologies for any inconvenience this may cause.
UPDATE 01 – 20:20
We have discovered only 1 miss-configured BGP filter on core01.lon01.structuredcommunications.co.uk. The BGP filter was only client facing and not carrier as originally suspected. No changes have been made to our carrier peering and no loss of service was seen.