Reference Guide

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.
Examples
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)#
Related
Commands
show ip protocols — views information on all routing protocols enabled and active on the E-
Series.
bgp router-id
Assign a user-given ID to a BGP router.
S4820T
Syntax
bgp router-id ip-address
To delete a user-assigned IP address, use the no bgp router-id command.
Parameters
ip-address Enter an IP address in dotted decimal format to reset only that BGP
neighbor.
Defaults The router ID is the highest IP address of the Loopback interface or, if no Loopback interfaces
are configured, the highest IP address of a physical interface on the router.
Command Modes ROUTER BGP
Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.7.0 Introduced on the S4810.
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