accommodate the new entries. Hot lock ACLs are enabled by default and support both standard and
extended ACLs.
NOTE: Hot lock ACLs are supported for Ingress ACLs only.
Implementing ACL on the Dell Networking OS
You can assign one IP ACL per interface with the Dell Networking OS. If you do not assign an IP ACL to
an interface, it is not used by the software in any other capacity.
The number of entries allowed per ACL is hardware-dependent. For detailed specification on entries
allowed per ACL, refer to your line card documentation.
If you enable counters on IP ACL rules that are already configured, those counters are reset when a new
rule is inserted or prepended. If a rule is appended, the existing counters are not affected. This is
applicable to the following features:
L2 Ingress Access list
L2 Egress Access list
L3 Ingress Access list
L3 Egress Access list
NOTE: IP ACLs are supported over VLANs in the Dell Networking OS version 6.2.1.1 and higher.
ACLs and VLANs
There are some differences when assigning ACLs to a VLAN rather than a physical port.
For example, when using a single port-pipe, if you apply an ACL to a VLAN, one copy of the ACL entries is
installed in the ACL CAM on the port-pipe. The entry looks for the incoming VLAN in the packet. Whereas
if you apply an ACL on individual ports of a VLAN, separate copies of the ACL entries are installed for each
port belonging to a port-pipe.
ACL Optimization
If an access list contains duplicate entries, the system deletes one entry to conserve CAM space.
Standard and extended ACLs take up the same amount of CAM space. A single ACL rule uses two CAM
entries whether it is identified as a standard or extended ACL.
Determine the Order in which ACLs are Used to Classify Traffic
When you link class-maps to queues using the service-queue command, the system matches the
class-maps according to queue priority (queue numbers closer to 0 have lower priorities).
As shown in the following example, class-map cmap2 is matched against ingress packets before cmap1.
Access Control Lists (ACLs) 111