Command Line Reference Guide

IPv6 Border Gateway Protocol (IPv6 BGP) | 755
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
bgp router-id
c e
Assign a user-given ID to a BGP router.
Syntax
bgp router-id ip-address
To delete a user-assigned IP address, enter no bgp router-id.
Parameters
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
Usage
Information
Peering sessions are reset when you change the router ID of a BGP router.
bgp soft-reconfig-backup
c e
t
Use this command only when route-refresh is not negotiated between peers to avoid having a peer
resend BGP updates.
Syntax
bgp soft-reconfig-backup
To return to the default setting, use the no bgp soft-reconfig-backup command.
Defaults
Off
show ip protocols View information on all routing protocols enabled and active on the
E-Series.
Version 8.4.2.1 Introduced on C-Series and S4810.
Version 8.2.1.0 Introduced on E-Series ExaScale
Version 7.4.1.0 Introduced on E-Series TeraScale
ip-address
Enter an IP address in dotted decimal format to reset only that BGP neighbor.
Version 8.4.2.1 Introduced on C-Series and S4810.
Version 8.2.1.0 Introduced on E-Series ExaScale
Version 7.4.1.0 Introduced on E-Series TeraScale