Dell S6000 FTOS 9.0(2.0) Command Line Reference Guide for the System - Page 226

www.dell.com | support.dell.com Version 7.8.1.0 Version 7.2.1.0 Introduced support on S-Series Introduced bgp regex-eval-optz-disable s z S6000 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 by default Command Modes ROUTER BGP (conf-router_bgp) 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 quite 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 a lot of 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. Command History Version 9.0.2.0 Version 8.3.11.1 Version 7.8.1.0 Version 9.0.2.0 Introduced on the S6000. Introduced on the Z9000. Introduced support on S-Series Introduced Example Figure 9-2. Command Example: no bgp regex-eval-optz-disable FTOS(conf-router_bgp)#no bgp regex-eval-optz-disable FTOS(conf-router_bgp)#do show ip protocols Routing Protocol is "ospf 22222" Router ID is 2.2.2.2 Area Routing for Networks 51 10.10.10.0/00 Routing Protocol is "bgp 1" Cluster Id is set to 10.10.10.0 Router Id is set to 10.10.10.0 Fast-external-fallover enabled Regular expression evaluation optimization enabled Capable of ROUTE_REFRESH For Address Family IPv4 Unicast BGP table version is 0, main routing table version 0 Distance: external 20 internal 200 local 200 FTOS(conf-router_bgp)# 226 | Border Gateway Protocol