BGP Routing Setup
BGP is the protocol that routes the internet — and the protocol most likely to cause a major outage if misconfigured. We set up BGP peering for multi-homed connectivity, hybrid cloud links, and anycast routing with proper route filtering, path selection, and failover behavior.
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BGP Peering & Session Management
We configure eBGP sessions with upstream providers, IXP peers, or cloud Direct Connect/ExpressRoute endpoints. Sessions use MD5 authentication, TTL security (GTSM), and maximum prefix limits to prevent route leaks from crashing your router. BFD (Bidirectional Forwarding Detection) enables sub-second failover detection. Each session gets monitored for state changes, prefix counts, and flap frequency.
Route Filtering & Security
Inbound filters reject bogon prefixes, your own prefixes (prevent loops), and prefixes not registered in IRR databases. Outbound filters ensure you only announce your own prefixes — preventing accidental route hijacking. RPKI validation rejects routes with invalid origin attestation. Prefix lists and AS-path filters are generated from RADB/IRR data and updated automatically. We've seen one missing filter cause global routing incidents.
Path Selection & Traffic Engineering
Local preference controls outbound path selection — prefer lower-latency or lower-cost providers. MED (Multi-Exit Discriminator) and AS-path prepending influence inbound traffic from peers. Communities tag routes for provider-specific traffic engineering (blackholing, regional preference). We model traffic flows and tune BGP attributes to match your cost and performance objectives.
Failover & Redundancy
Multi-homed setups with two or more upstream providers ensure no single link failure causes an outage. BFD detects link failures in milliseconds; BGP converges and reroutes traffic within seconds. We test failover by simulating link failures — verifying that traffic shifts cleanly and performance remains acceptable on the backup path. Runbooks document expected failover behavior and manual intervention procedures.
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