Configure Layer 2 And Layer 3 Acls; Using Acl Vlan Groups - Dell Z9500 Configuration Manual

based on the order in which they were configured (for example, the first filter was given the lowest sequence number). The
show config command in IP ACCESS LIST mode displays the two filters with the sequence numbers 5 and 10.
Example of Viewing Filter Sequence for a Specified Extended ACL
Dell(config-ext-nacl)#deny tcp host 123.55.34.0 any
Dell(config-ext-nacl)#permit udp 154.44.123.34 0.0.255.255 host 34.6.0.0
Dell(config-ext-nacl)#show config
!
ip access-list extended nimule
seq 5 deny tcp host 123.55.34.0 any
seq 10 permit udp 154.44.0.0 0.0.255.255 host 34.6.0.0
Dell(config-ext-nacl)#
To view all configured IP ACLs and the number of packets processed through the ACL, use the show ip accounting
access-list command in EXEC Privilege mode, as shown in the first example in

Configure Layer 2 and Layer 3 ACLs

Both Layer 2 and Layer 3 ACLs may be configured on an interface in Layer 2 mode.
If both L2 and L3 ACLs are applied to an interface, the following rules apply:
• When Dell Networking OS routes the packets, only the L3 ACL governs them because they are not filtered against an L2
ACL.
• When Dell Networking OS switches the packets, first the L3 ACL filters them, then the L2 ACL filters them.
• When Dell Networking OS switches the packets, the egress L3 ACL does not filter the packet.
For the following features, if you enable counters on rules that have already been configured and a new rule is either inserted
or prepended, all the existing counters are reset:
• L2 ingress access list
• L3 egress access list
• L2 egress access list
If a rule is simply appended, existing counters are not affected.
Table 4. L2 and L3 Filtering on Switched Packets
L2 ACL Behavior
Deny
Deny
Permit
Permit
NOTE: If you configure an interface as a vlan-stack access port, only the L2 ACL filters the packets. The L3 ACL applied to
such a port does not affect traffic. That is, existing rules for other features (such as trace-list, policy-based routing [PBR],
and QoS) are applied to the permitted traffic.
For information about MAC ACLs, refer to

Using ACL VLAN Groups

Use an ACL VLAN group to optimize ACL CAM usage by minimizing the number of CAM entries when you apply an egress IP
ACL on the member interfaces of specified VLANs.
When you apply an ACL on individual VLANs, the amount of CAM space required increases greatly because the ACL rules are
saved for each VLAN ID. To avoid excessive use of the CAM space, you can configure ACL VLAN groups to combine all VLANs
on which ACL filtering criteria is applied in a single class ID instead of multiple VLAN IDs.
L3 ACL Behavior
Deny
Permit
Deny
Permit
Layer 2.
Configure a Standard IP ACL
Decision on Targeted Traffic
L3 ACL denies.
L3 ACL permits.
L3 ACL denies.
L3 ACL permits.
Access Control Lists (ACLs)
Filter.
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