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Dell Configuration Guide for the S4048–ON System 9.14.2.5

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BGP Regular Expression Optimization

Dell EMC Networking OS optimizes processing time when using regular expressions by caching and re-using regular expression evaluated results, at the expense of some memory in RP1 processor.

BGP policies that contain regular expressions to match against as-paths and communities might take a lot of CPU processing time, thus affect BGP routing convergence. Also, show bgp commands that get filtered through regular expressions can to take a lot of CPU cycles, especially when the database is large.

This feature is turned on by default. If necessary, use the bgp regex-eval-optz-disable command in CONFIGURATION ROUTER BGP mode to disable it.


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