Related
Commands
clear ip bgp
bgp regex-eval-optz-disable
Disables the Regex Performance engine that optimizes complex regular expression with BGP.
C-Series, E-Series
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
Version 8.2.1.0
Introduced on the E-Series ExaScale.
Version 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 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
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.
C-Series, E-Series
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 you do not configure
Loopback interfaces, the highest IP address of a physical interface on the router.
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Summary of Contents for Force10 Z9000
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