Cisco 10008 Installation And Configuration Manual page 48

hw-module tcam
hw-module tcam
To configure the router to merge (or not merge) access control list entries (ACEs) when compiling and
storing ACEs in Ternary Content Addressable Memory (TCAM), use the hw-module tcam command in
global configuration mode. To not merge ACEs, use the no form of the command.
Syntax Description
no-merge
with-pt-tree
Command Default The router uses the original ACE to program TCAM (no-merge option).
Command Modes Global configuration
Command History Release
12.2(31)SB2
12.2(33)SB
Usage Guidelines Ternary Content Addressable Memory (TCAM) is a hardware device on the PRE3 and the PRE4 that
enables QoS ACLs to be collapsed and stored densely. Instead of using the TurboACL algorithm of the
PRE3, the PRE3 uses the TCAM to implement ACL lookup for quick retrieval.
The PRE2 does not support the following features for IPv4 security ACLs:
•
•
IPv4 template ACLs have the same functionality on the PR2 as the PRE2 implementation.
The router supports the collection of per-ACE statistical information using the hw-module tcam
compile no-merge command.
When configured, the hw-module tcam command applies to all newly added or modified ACLs and
QoS-related TCAM entries. When you reload the router or microcode, the command applies to all ACL
and QoS-related TCAM entries.
Cisco 10008 Router PRE4 Installation and Configuration Guide
48
hw-module tcam compile {no-merge | with-pt-tree}
no hw-module tcam compile with-pt-tree
Programs the TCAM using the original ACE instead of merging ACEs. This
option enables you to display per-ACE statistics for security access control
lists (ACLs).
Uses a TCAM merge algorithm to collapse ACEs, which improves the
utilization and scalability of TCAM. However, this option aggregates
statistical information at the ACL level, disabling the router's ability to
provide per-ACE statistics for security ACLS.
Modification
This command was introduced on the PRE3 for the Cisco 10000 series
router.
This command was introduced on the PRE4 for the Cisco 10000 series
router.
IPv4 mini-ACLs (less than 8 ACEs)
Incremental compilation
OL-13840-01