Users Guide

bgp regex-eval-optz-disable
Disables the Regex Performance engine that optimizes complex regular expression with BGP.
Syntax
bgp regex-eval-optz-disable
To re-enable optimization engine, use the no bgp regex-eval-optz-disable
command.
Defaults Enabled
Command Modes ROUTER BGP (conf-router_bgp)
Command History
This guide is platform-specific. For command information about other platforms, see
the relevant Dell Networking OS Command Line Reference Guide.
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000–ON.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
7.8.1.0 Introduced on the S-Series.
7.7.1.0 Introduced on the C-Series.
7.6.1.0 Introduced
Usage Information
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
Border Gateway Protocol 403