Dell Force10 S25N-S50N FTOS Command Line Reference Guide FTOS 8.4.2.7 E-Series - Page 330

www.dell.com | support.dell.com Related Commands Command History clear ip bgp ipv4 unicast soft Clear and reapply policies for IPv4 routes without resetting the TCP connection; that is, perform BGP soft reconfiguration. Version 7.8.1.0 Version 7.7.1.0 Version 7.2.1.0 Introduced support on S-Series Introduced support on C-Series Introduced bgp regex-eval-optz-disable c e s 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. Related Commands Command History show ip protocols View information on all routing protocols enabled and active on the E-Series. Version 7.8.1.0 Version 7.7.1.0 Version 7.6.1.0 Introduced support on S-Series Introduced support on C-Series Introduced 330 | Border Gateway Protocol IPv4 (BGPv4)