Administrator Guide
• A line card returns to the active state after going down, and this line card contains a VLAN that is a member of an ACL group.
• The ACL VLAN group is deleted and it contains VLAN members.
The ACL manager does not notify the ACL agent in the following cases:
• The ACL VLAN group is created.
• The ACL VLAN group is deleted and it does not contain any VLAN members.
• The ACL is applied or removed from a group, and the ACL group does not contain a VLAN member.
• The description of the ACL group is added or removed.
Guidelines for Conguring ACL VLAN groups
Keep the following points in mind when you congure ACL VLAN groups:
• The interfaces, to which the ACL VLAN group is applied, function as restricted interfaces. The ACL VLAN group name is used to
identify the group of VLANs that is used to perform hierarchical ltering.
• You can add only one ACL to an interface at a time.
• When you attach an ACL VLAN group to the same interface, a validation is performed to determine whether an ACL is applied
directly to an interface. If you previously applied an ACL separately to the interface, an error occurs when you attempt to attach
an ACL VLAN group to the same interface.
• The maximum number of members in an ACL VLAN group is determined by the type of switch and its hardware capabilities. This
scaling limit depends on the number of slices that are allocated for ACL CAM optimization. If one slice is allocated, the maximum
number of VLAN members is 256 for all ACL VLAN groups. If two slices are allocated, the maximum number of VLAN members
is 512 for all ACL VLAN groups.
• The maximum number of VLAN groups that you can congure also depends on the hardware specications of the switch. Each
VLAN group is mapped to a unique ID in the hardware. The maximum number of ACL VLAN groups supported is 31. Only a
maximum of two components (iSCSI counters, Open Flow, ACL optimization) can be allocated virtual ow processing slices at a
time.
• The maximum number of VLANs that you can congure as a member of ACL VLAN groups is limited to 512 on the MXL switch if
two slices are allocated. If only one virtual ow processing slice is allocated, the maximum number of VLANs that you can
congure as a member of an ACL VLAN group is 256 for the MXL switch.
• 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
qualier 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 ow 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 eectively 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.
Conguring ACL VLAN Groups and Conguring FP Blocks for VLAN
Parameters
This section describes how to optimize the utilization of CAM blocks by conguring ACL VLAN groups that you can attach to VLAN
interfaces and also how to congure FP blocks for dierent VLAN operations.
Conguring 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
Access Control List (ACL) VLAN Groups and Content Addressable Memory (CAM)
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