BGP session flap with Telia in Frankfurt (FRA1)

Affected:

Network · FRA1

Duration

1 h 04

Reference

inc-20260511-1

Timeline

1. Resolved11 May 2026, 04:08 UTC

   Resolved. Total impact: intermittent reroutes for about 64 minutes; no session was lost on customer servers.

2. Monitoring11 May 2026, 03:47 UTC

   The session has been stable for 20 minutes after the carrier corrected the interface configuration.

3. Identified11 May 2026, 03:21 UTC

   The flap is caused by an MTU mismatch introduced during a carrier-side change. The session is administratively shut while it is corrected.

4. Investigating11 May 2026, 03:04 UTC

   One of our BGP sessions with Telia in Frankfurt (FRA1) is flapping. Some destinations may see brief reroutes and increased latency.

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