Bgp Regex-Eval-Optz-Disable - Dell Z9500 Reference Manual

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clear ip bgp

bgp regex-eval-optz-disable

Disables the Regex Performance engine that optimizes complex regular expression with BGP.

bgp regex-eval-optz-disable

To re-enable optimization engine, use the no bgp regex-eval-optz-disable

ROUTER BGP (conf-router_bgp)

This guide is platform-specific. For command information about other platforms,

refer to the relevant Dell Networking OS Command Line Reference Guide.

The following is a list of the Dell Networking OS version history for this command.

BGP uses regular expressions (regex) to filter route information. In particular, the

use of regular expressions to filter routes based on AS-PATHs and communities is

common. In a large-scale configuration, filtering millions of routes based on

regular expressions can be quite CPU intensive, as a regular expression evaluation

involves generation and evaluation of complex finite state machines.

BGP policies, containing regular expressions to match as-path and communities,

tend to use much CPU processing time, which in turn affects the BGP routing

convergence. Additionally, the show bgp commands, which are filtered through

regular expressions, use up CPU cycles particularly with large databases. The Regex

Engine Performance Enhancement feature optimizes the CPU usage by caching

and reusing regular expression evaluation results. This caching and reuse may be at

the expensive of RP1 processor memory.

Border Gateway Protocol

— clears the ip bgp.

Introduced on the Z9500.

Introduced on the S4820T.

Introduced on the Z9000.

Introduced on the S4810.

Introduced on the S-Series.

Introduced on the C-Series.