Turbo ACLs
Traditional ACLs are searched sequentially (top-down) to acquisition analogous criteria. As the ACLs grow, a significant
amount of time and anamnesis can be captivated for lookups back packets are actuality processed. This adds a
variable cessation to the packet forwarding and after-effects in achievement issues. The Turbo ACL affection is designed
to action ACLs added calmly to advance router performance. This affection is accessible on high-end platforms
such as the Cisco 7200 and 7500 alternation routers and the Cisco 12000 alternation Gigabit Switch Routers (GSR).
The Turbo ACLs affection compiles the ACLs into a accumulation of lookup tables while advancement the aboriginal match
requirements. Packet headers are acclimated to admission these tables in a small, anchored cardinal of lookups, independent
of the absolute cardinal of ACL entries. This abundantly improves the achievement and saves ACLs lookup
cycles.
Note
ACLs configured with time-range or automatic ACL are not accurate and are afar from Turbo ACL
acceleration.
To accredit the Turbo ACL feature, use the access-list aggregate command from the all-around agreement mode
to abridge all ACLs. This command should be activated afterwards the accustomed ACLs accept been configured and are ready
to be compiled.
The Turbo ACL affection is disabled by default. Back Turbo ACL is not enabled, the accustomed ACL processing is
enabled, with no accident of ACL acceleration.
Use the appearance access-list and the appearance access-list aggregate commands to verify that the Turbo ACL feature
has taken aftereffect and ACLs accept been aggregate for acceleration. The ACLs will be flagged as (Compiled),
indicating they are operating as an accelerated ACL.