Synthèse
Before manipulating traffic paths, network stability requires strict control over which routes are allowed into and out of your network. We've seen customers extensively use BGP route policies to filter out unwanted learned routes from peers or prevent specific subnet prefixes from being advertised out of their Virtual Private Cloud (VPC). Operating on a "fail open" model by default, many security-conscious organizations have adapted BGP route policies to create a "fail closed" environment — app
Before manipulating traffic paths, network stability requires strict control over which routes are allowed into and out of your network. We've seen customers extensively use BGP route policies to filter out unwanted learned routes from peers or prevent specific subnet prefixes from being advertised out of their Virtual Private Cloud (VPC). Operating on a "fail open" model by default, many security-conscious organizations have adapted BGP route policies to create a "fail closed" environment — appending a "drop all" policy as the final term in their evaluation list. This helps enable absolute certainty over accepted network routes, preventing routing loops and ensuring traffic isn't BGP hijacked or inadvertently blackholed. Dive deeper: For a foundational look at how to set up CEL expressions for route filtering, check out our deep-dive guide: Introduction to BGP policies.
Source originale
medium.com
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