Users Guide
Usage Information
This command is a knob to disable BGP next-hop resolution using BGP learned routes. During the next-hop
resolution, only the rst route that the next-hop resolves through is veried for the route’s protocol source
and is checked if the route is learned from BGP or not.
The clear ip bgp command is required for this command to take eect and to keep the BGP database
consistent. Execute the clear ip bgp command right after executing this command.
Related Commands clear ip bgp — clears the 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-specic. For command information about other platforms, refer to the relevant Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
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 lter route information. In particular, the use of regular expressions
to lter routes based on AS-PATHs and communities is common. In a large-scale conguration, ltering
millions of routes based on regular expressions can be quite CPU intensive, as a regular expression evaluation
involves generation and evaluation of complex nite state machines.
BGP policies, containing regular expressions to match as-path and communities, tend to use much CPU
processing time, which in turn aects the BGP routing convergence. Additionally, the show bgp
commands, which are ltered through regular expressions, use up CPU cycles particularly with large
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Border Gateway Protocol