Administrator Guide

Usage Information
After configuring the bgp redistribute-internal command, use the clear ip bgp * command to
clear all BGP sessions. If you don’t clear all BGP sessions, route redistribution happens only for new routes.
NOTE: When you enable redistribution of iBGP routes into an IGP, ensure that you use route maps
to control what prefixes are redistributed. Redistributing all iBGP routes can create a loop in the
network.
Example
Router(config)# router ospf 10
Router(config-router_ospf)# redistribute bgp 10 route-map bgp_2_ospf
Router(config-router_ospf)# exit
DellEMC(conf)# router bgp 10
DellEMC(conf-router_bgp)# bgp redistribute-internal
Caution: Might cause routing loops; please use prefix-list to restrict the
prefixes
Router(config-router_bgp)# end
Router# clear ip bgp
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 EMC
Networking OS Command Line Reference Guide.
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S3148.
9.10(0.0) Introduced on the S6100-ON.
9.8(2.0) Introduced on the S3100 series.
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.
340 Border Gateway Protocol