Dell PowerSwitch S4820T 9.50.1 Configuration Guide for the S4820T System - Page 112
Configuring ACL VLAN Groups and Configuring FP Blocks for VLAN Parameters, Configuring ACL VLAN Groups
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• • Port ACL optimization is applicable only for ACLs that are applied without the VLAN range. • You cannot view the statistical details of ACL rules per VLAN and per interface if you enable the ACL VLAN group capability. You can view the counters per ACL only using the show ip accounting access list command. • Within a port, you can apply Layer 2 ACLs on a VLAN or a set of VLANs. In this case, CAM optimization is not applied. • To enable optimization of CAM space for Layer 2 or Layer 3 ACLs that are applied to ports, the port number is removed as a qualifier for ACL application on ports, and port bits are used. When you apply the same ACL to a set of ports, the port bitmap is set when the ACL flow processor (FP) entry is added. When you remove the ACL from a port, the port bitmap is removed. • If you do not attach an ACL to any of the ports, the FP entries are deleted. Similarly, when the same ACL is applied on a set of ports, only one set of entries is installed in the FP, thereby effectively saving CAM space. The optimization is enabled only if you specify the optimized option with the ip access-group command. This option is not valid for VLAN and LAG interfaces. Configuring ACL VLAN Groups and Configuring FP Blocks for VLAN Parameters This section describes how to optimize the utilization of CAM blocks by configuring ACL VLAN groups that you can attach to VLAN interfaces and also how to configure FP blocks for different VLAN operations. Configuring ACL VLAN Groups You can create an ACL VLAN group and attach the ACL with the VLAN members. The optimization is applicable only when you create an ACL VLAN group. If you apply an ACL separately on the VLAN interface, each ACL has a mapping with the VLAN and increases the CAM space utilization. Attaching an ACL individually to VLAN interfaces is similar to the behavior of ACL-VLAN mapping storage in CAM prior to the implementation of the ACL VLAN group functionality. 1. Create an ACL VLAN group CONFIGURATION mode acl-vlan-group {group name} You can have up to eight different ACL VLAN groups at any given time. 2. Add a description to the ACL VLAN group. CONFIGURATION (conf-acl-vl-grp) mode description description 3. Apply an egress IP ACL to the ACL VLAN group. CONFIGURATION (conf-acl-vl-grp) mode ip access-group {group name} out implicit-permit 4. Add VLAN member(s) to an ACL VLAN group. CONFIGURATION (conf-acl-vl-grp) mode member vlan {VLAN-range} 112 Access Control List (ACL) VLAN Groups and Content Addressable Memory (CAM)
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