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Cisco Nexus 5500 Series NX-OS Security Command Reference
OL-27883-02
Chapter D Commands
deny (MAC)
deny (MAC)
To create a Media Access Control (MAC) access control list (ACL)+ rule that denies traffic matching its
conditions, use the deny command. To remove a rule, use the no form of this command.
[sequence-number] deny source destination [protocol] [cos cos-value] [vlan vlan-id]
no deny source destination [protocol] [cos cos-value] [vlan vlan-id]
no sequence-number
Syntax Description
Command Default A newly created MAC ACL contains no rules.
If you do not specify a sequence number, the switch assigns the rule a sequence number that is 10 greater
than the last rule in the ACL.
Command Modes MAC ACL configuration mode
sequence-number (Optional) Sequence number of the deny command, which causes the switch
to insert the command in that numbered position in the access list. Sequence
numbers maintain the order of rules within an ACL.
A sequence number can be any integer between 1 and 4294967295.
By default, the first rule in an ACL has a sequence number of 10.
If you do not specify a sequence number, the switch adds the rule to the end
of the ACL and assigns to it a sequence number that is 10 greater than the
sequence number of the preceding rule.
Use the resequence command to reassign sequence numbers to rules.
source Source MAC addresses that the rule matches. For details about the methods
that you can use to specify this argument, see “Source and Destination” in
the “Usage Guidelines” section.
destination Destination MAC addresses that the rule matches. For details about the
methods that you can use to specify this argument, see “Source and
Destination” in the “Usage Guidelines” section.
protocol (Optional) Protocol number that the rule matches. Valid protocol numbers
are 0x0 to 0xffff. For listings of valid protocol names, see “MAC Protocols”
in the “Usage Guidelines” section.
cos cos-value (Optional) Specifies that the rule matches only packets whose IEEE 802.1Q
header contains the class of service (CoS) value given in the cos-value
argument. The cos-value argument can be an integer from 0 to 7.
vlan vlan-id (Optional) Specifies that the rule matches only packets whose IEEE 802.1Q
header contains the VLAN ID given. The vlan-id
argument can be an integer
from 1 to 4094.
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