BGP session flap with Telstra in Singapore (SIN1)

Affected:

Network · SIN1

Duration

1 h 52

Reference

inc-20260418-1

Timeline

1. Resolved18 Apr 2026, 17:10 UTC

   Resolved. Total impact: intermittent reroutes for about 112 minutes; no session was lost on customer servers.

2. Monitoring18 Apr 2026, 16:36 UTC

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

3. Identified18 Apr 2026, 15:43 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. Investigating18 Apr 2026, 15:18 UTC

   One of our BGP sessions with Telstra in Singapore (SIN1) is flapping. Some destinations may see brief reroutes and increased latency.

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