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.
bgp router-id
Assign a user-given ID to a BGP router.
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 no Loopback
interfaces are configured, the highest IP address of a physical interface on the
router.
Command
Modes
ROUTER BGP
Command
History
Version 9.2(0.0) Introduced on the MXL 10/40GbE Switch IO Module.
Usage
Information
Peering sessions are reset when you change the router ID of a BGP router.
bgp soft-reconfig-backup
Use this command only when route-refresh is not negotiated between peers to avoid having a peer re-
send BGP updates.
Syntax
bgp soft-reconfig-backup
To return to the default setting, use the no bgp soft-reconfig-backup
command.
Defaults Off
706
IPv6 Border Gateway Protocol (IPv6 BGP)
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