Defaults
Enabled
Command Modes
ROUTER BGP (conf-router_bgp)
Command History
Version 8.3.11.1
Introduced on the Z9000.
Version 8.3.7.0
Introduced on the S4810.
Version 7.8.1.0
Introduced on the S-Series.
Version 7.7.1.0
Introduced on the C-Series.
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.
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.
C-Series, E-Series, S-Series, Z-Series, S4810
Syntax
bgp router-id
ip-address
To delete a user-assigned IP address, use the
no bgp router-id
command.
345
Summary of Contents for Force10 Z9000
Page 1: ...FTOS Command Line Reference Guide for the Z9000 System FTOS 9 1 0 0 ...
Page 96: ...96 ...
Page 194: ...194 ...
Page 312: ...312 ...
Page 540: ...540 ...
Page 546: ...546 ...
Page 560: ...560 ...
Page 566: ...566 ...
Page 590: ...action act UpdateCounter param0 1 0x01 param1 0 0x00 output truncated 590 ...
Page 624: ...624 ...
Page 638: ...638 ...
Page 648: ...648 ...
Page 659: ...Related Commands show gvrp displays the GVRP configuration 659 ...
Page 660: ...660 ...
Page 834: ...834 ...
Page 854: ...854 ...
Page 906: ...906 ...
Page 914: ...914 ...
Page 976: ...976 ...
Page 990: ...990 ...
Page 1006: ...1006 ...
Page 1008: ...1008 ...
Page 1026: ...1026 ...
Page 1145: ...10 211 1 2 Outgoing interface list GigabitEthernet 8 0 1145 ...
Page 1146: ...1146 ...
Page 1156: ...1156 ...
Page 1166: ...1166 ...
Page 1180: ...1180 ...
Page 1258: ...1258 ...
Page 1272: ...1272 ...
Page 1394: ...1394 ...
Page 1400: ...1400 ...
Page 1410: ...1410 ...
Page 1424: ...1424 ...
Page 1444: ...1444 ...
Page 1468: ...Version 8 3 8 0 Introduced on the S4810 1468 ...
Page 1470: ...1470 ...