Implementing Acls - Dell C9000 Series Networking Configuration Manual

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Current Settings(in block sizes)

1 block = 256 entries

Dell(conf)#cam-acl-egress-pe l2acl 2 ipv4acl 2 ipv6acl 0

The following example displays the running configuration for the configured CAM ACLs.

Dell(conf)#do show running-config | grep cam-acl

cam-acl l2acl 3 ipv4acl 4 ipv6acl 0 ipv4qos 2 l2qos 1 l2pt 0 ipmacacl 0 vman-qos 0

ecfmacl 0 ipv4pbr 2

cam-acl-pe l2acl 3 ipv4acl 2 ipv6acl 2 ipv4qos 2 l2qos 1 ipmacacl 2

cam-acl-egress-pe l2acl 2 ipv4acl 2 ipv6acl 0

Implementing ACLs

You can assign one IP ACL per physical or VLAN interface. 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.

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 Egress Access list

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.

When you use the log keyword, the CP has to log the details about the packets that match. Depending on

how many packets match the log entry and at what rate, the CP might become busy as it has to log these

packets' details. However, the Route Processor (RP) is unaffected. This option is typically useful when

debugging some problem related to control traffic. We have used this option numerous times in the field and

have not encountered problems so far.

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.

Access Control Lists (ACLs)