BGP failover basics for multi-site clients
Overview
BGP provides multi-homed internet independence—overkill for tiny SMB, gold for uptime-critical.
Concepts
ASN, prefixes, AS-PATH prepending, local-preference tuning for primary/backup.
Safety
Prefix filters prevent becoming accidental transit AS.
Test
Controlled failover during maintenance; verify DNS TTL doesn’t trap stale entries.
Docs
Letter of authorization to ISP; diagram full mesh vs hub-spoke.
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