Next-Gen Unix, Storage & Infrastructure Operational Paradigms
BGP Routing in Enterprise Data Centers
BGP has become the routing protocol of choice inside modern data centers, providing scalable, policy-driven connectivity across spine-leaf fabrics. It brings internet-scale tooling into the building, but also internet-scale complexity. Operating BGP in a data center means careful peering design, route filtering, and monitoring for leaks and flaps that can blackhole traffic.
Points clés
- Use eBGP between tiers with unique ASNs per rack or device for simple, scalable peering.
- Apply strict prefix filters and maximum-prefix limits to prevent route leaks.
- Monitor BGP session state and route counts as core infrastructure SLOs.
- Design for fast convergence with BFD and tuned timers where hardware supports it.
- Keep routing policy in version control and review changes like application code.
- Use route reflectors or a controller to reduce peering mesh complexity at scale.
- Test failure scenarios including link, switch, and peer loss before production.
- Document peering and policy so on-call engineers can reason during incidents.
Questions fréquentes
Why BGP instead of OSPF in the data center?
BGP scales better and treats the fabric like a set of independent peers.
What is a route leak?
An unintended advertisement of prefixes that can blackhole or hijack traffic.
Is BGP hard to troubleshoot?
It can be, which is why monitoring and documentation matter more than with simpler protocols.
Do I need BFD?
It helps fast failure detection, but only where hardware and software support it reliably.
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