Configure Layer 2 And Layer 3 Acls - Dell Z9000 Configuration Manual

{deny | permit} {source mask | any | host ip-address} [count [byte]] [order]
[fragments]
• Configure a deny or permit filter to examine TCP packets.
CONFIG-EXT-NACL mode
{deny | permit} tcp {source mask] | any | host ip-address}} [count [byte]]
[order] [fragments]
• Configure a deny or permit filter to examine UDP packets.
CONFIG-EXT-NACL mode
{deny | permit} udp {source mask | any | host ip-address}} [count [byte]]
[order] [fragments]
When you use the log keyword, the CP logs details about the packets that match. Depending on how
many packets match the log entry and at what rate, the CP may become busy as it has to log these
packets' details.
The following example shows an extended IP ACL in which the sequence numbers were assigned by the
software. The filters were assigned sequence numbers 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 a Standard IP ACL

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
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Filter.
Access Control Lists (ACLs)