Bgp Router-Id - Dell C9000 Series Reference Manual

Networking command-line reference guide

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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.

show ip protocols

bgp router-id

Assign a user-given ID to a BGP router.

C9000 Series

bgp router-id ip-address

To delete a user-assigned IP address, use the no bgp router-id command.

The router ID is the highest IP address of the Loopback interface or, if you do not

configure Loopback interfaces, the highest IP address of a physical interface on the

Command Modes

Command History

Usage Information Peering sessions are reset when you change the router ID of a BGP router.

– views information on all enabled and active routing protocols.

Enter an IP address in dotted decimal format to reset only that

BGP neighbor.

Introduced on the C9010.

Introduced on the Z9500.

Introduced on the E-Series ExaScale.

Border Gateway Protocol

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