CLI Guide

To disable next-hop resolution, use the no bgp recursive-bgp-next-hop command.
Defaults Enabled.
Command Modes ROUTER BGP
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.2(0.0) Introduced on the MXL 10/40GbE Switch IO Module.
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 veried for the route’s protocol source and is
checked if the route is learned from BGP or not.
For this command to take eect and to keep the BGP database consistent, you need the clear ip bgp
command. Execute the clear ip bgp command right after executing this command.
Related Commands capture bgp-pdu max-buer-size
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)
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.2(0.0) Introduced on the MXL 10/40GbE Switch IO Module.
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 quite common. In a large scale conguration, 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 a lot of CPU
processing time, which in turn aects the BGP routing convergence. Additionally, the show bgp commands,
which are ltered 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.
674 IPv6 Border Gateway Protocol (IPv6 BGP)