Administrator Guide

Allocating FP Blocks for VLAN Processes
The VLAN contentaware processor (VCAP) application is a pre-ingress CAP that modifies the VLAN settings before packets are
forwarded. To support ACL CAM optimization, the CAM carving feature is enhanced. A total of four VCAP groups are present: two fixed
groups and two dynamic groups. Of the two dynamic groups, you can allocate zero, one, or two FP blocks to iSCSI Counters, Open Flow,
and ACL Optimization.
You can configure only two of these features at a time.
• To allocate the number of FP blocks for VLAN open flow operations, use the cam-acl-vlan vlanopenflow <0-2> command.
• To allocate the number of FP blocks for VLAN iSCSI counters, use the cam-acl-vlan vlaniscsi <0-2> command.
• To allocate the number of FP blocks for ACL VLAN optimization, use the cam-acl-vlan vlanaclopt <0-2> command.
To reset the number of FP blocks to the default, use the no version of these commands. By default, zero groups are allocated for the ACL
in VCAP. ACL VLAN groups or CAM optimization is not enabled by default. You must also allocate the slices for CAM optimization.
To display the number of FP blocks that is allocated for the different VLAN services, use the show cam-acl-vlan command. After you
configure the ACL VLAN groups, reboot the system to store the settings in nonvolatile storage. During CAM initialization, the chassis
manager reads the NVRAM and allocates the dynamic VCAP regions.
ACL Optimization to Increase Number of
Supported IPv4 ACLs
You can configure the Dell EMC Networking OS to support more number of IPv4 ACLs.
Restrictions for ACL Optimization
After you enable ACL optimization, the system does not support the following features:
• Mirroring dropped packets
• Ability to specify filtering for routed traffic only
• ACLs applied on physical ports with VRF ranges
• ACLs with filter parameters such as DSCP and ECN
• PIM VLT
• Filtering noninitial fragments of a datagram
If your ACL rules contain the following keywords, the system accepts the configuration and shows a message stating that these features
are not supported and ignores the configuration.
• ttl
• fragments
• no-drop
• dscp
• ecn
Optimizing ACL for More Number of IPv4 ACL Rules
To optimize ACL for more number of IPv4 ACL rules, follow these steps:
1. Carve the vlanaclopt CAM region.
CONFIGURATION mode
cam-acl-vlan vlanopenflow 0 vlaniscsi 0 vlanaclopt 2
2. Enable the ACL optimized feature.
CONFIGURATION mode
feature acloptimized
3. Reload the system
EXEC Privilege
reload
Access Control List (ACL) VLAN Groups and Content Addressable Memory (CAM)
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