Use prefix lists as an alternative to access lists with many BGP route
filtering commands. The advantages of using prefix lists rather than
access lists include the following:
- Significant performance improvement in loading and route lookup
of large lists.
- Support for incremental updates. Filtering by way of extended
access lists does not support incremental updates.
- A more user friendly command-line interface.
- Greater flexibility.
Define a prefix list before applying it as a route filter. The
Cisco IOS allows a very flexible configuration procedure, where each
statement can be assigned its own sequence numbers.
To define a prefix list, use the