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Border Gateway Protocol IPv4 (BGPv4)
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Related
Commands
Command
History
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
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
Introduced support on S-Series
Version 7.7.1.0
Introduced support on C-Series
Version 7.2.1.0
Introduced
View information on all routing protocols enabled and active on the E-Series.
Version 7.8.1.0
Introduced support on S-Series
Version 7.7.1.0
Introduced support on C-Series
Version 7.6.1.0
Introduced
Summary of Contents for Force10 TeraScale C Series
Page 1: ...FTOS Command Line Reference Guide FTOS 8 4 2 7 E Series TeraScale C Series S Series S50 S25 ...
Page 164: ...164 Control and Monitoring w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 176: ...176 802 1ag w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 188: ...188 802 3ah w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 204: ...204 802 1X w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 294: ...294 Access Control Lists ACL w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 428: ...428 Border Gateway Protocol IPv4 BGPv4 w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 456: ...456 Configuration Rollback w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 472: ...472 Dynamic Host Configuration Protocol DHCP w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 484: ...484 Far End Failure Detection FEFD w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 682: ...682 IPv4 Routing w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 732: ...732 IPv6 Basics w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 896: ...896 Layer 2 w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 914: ...914 Link Layer Detection Protocol LLDP w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 926: ...926 Multicast Listener Discovery MLD w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 952: ...952 Multiple Spanning Tree Protocol MSTP w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 976: ...976 Multicast w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 984: ...984 Neighbor Discovery Protocol NDP w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1094: ...1094 Policy based Routing PBR w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1130: ...1130 PIM Sparse Mode PIM SM w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1164: ...1164 Private VLAN PVLAN w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1276: ...1276 Rapid Spanning Tree Protocol RSTP w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1342: ...1342 Service Provider Bridging w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1354: ...1354 sFlow w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1428: ...1428 Spanning Tree Protocol STP w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1444: ...1444 Time and Network Time Protocol NTP w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1464: ...1464 VLAN Stacking w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1494: ...1494 Virtual Router Redundancy Protocol VRRP w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1534: ...1534 C Series Diagnostics and Debugging w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1574: ...1574 E Series Debugging and Diagnostics w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1592: ...1592 S Series Debugging and Diagnostics w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1622: ...1622 Index w w w d e l l c o m s u p p o r t d e l l c o m ...
Page 1640: ...1640 Command Index w w w d e l l c o m s u p p o r t d e l l c o m ...