Administrator Guide
When an ACL is created without any rule and then applied to an interface, ACL behavior reflects an implicit permit.
NOTE: Also refer to the Commands Common to all ACL Types and Common IP ACL Commands sections.
deny
Configure a filter that drops IP packets meeting the filter criteria.
C9000 Series
Syntax
deny {ip | ip-protocol-number} {source mask | any | host ip-address}
{destination mask | any | host ip-address} [count [bytes]] [dscp value] [order]
[monitor] [fragments] [log [interval minutes] [threshold-in-msgs [count]]
[monitor]
To remove this filter, you have two choices:
• Use the no seq sequence-number command if you know the filter’s sequence number.
• Use the no deny {ip | ip-protocol-number} {source mask | any | host ip-address}
{destination mask | any | host ip-address} command.
Parameters
ip Enter the keyword ip to configure a generic IP access list. The keyword ip specifies that
the access list denies all IP protocols.
ip-protocol-
number
Enter a number from 0 to 255 to deny based on the protocol identified in the IP protocol
header.
source
Enter the IP address of the network or host from which the packets were sent.
mask
Enter a network mask in /prefix format (/x) or A.B.C.D. The mask, when specified in
A.B.C.D format, may be either contiguous or noncontiguous.
any Enter the keyword any to specify that all routes are subject to the filter.
host
ip-address
Enter the keyword host then the IP address to specify a host IP address.
destination
Enter the IP address of the network or host to which the packets are sent.
count (OPTIONAL) Enter the keyword count to count packets that the filter processes.
bytes (OPTIONAL) Enter the keyword byte to count bytes that the filter processes.
dscp (OPTIONAL) Enter the keyword dcsp to match to the IP DSCP values. The range is from
0 to 63.
order (OPTIONAL) Enter the keyword order to specify the QoS priority for the ACL entry.
The range is from 0 to 254 (where 0 is the highest priority and 254 is the lowest; lower-
order numbers have a higher priority). If you do not use the keyword order, the ACLs
have the lowest order by default (255).
fragments Enter the keyword fragments to use ACLs to control packet fragments.
log (OPTIONAL) Enter the keyword log to include ACL matches in the log.
threshold-in msgs
count
(OPTIONAL) Enter the threshold-in-msgs keyword followed by a value to indicate
the maximum number of ACL logs that can be generated, exceeding which the generation
of ACL logs is terminated with the seq, permit, or deny commands. The threshold
range is from 1 to 100.
interval
minutes
(OPTIONAL) Enter the keyword interval followed by the time period in minutes at
which ACL logs must be generated. The threshold range is from 1 to 10 minutes.
monitor (OPTIONAL) Enter the keyword monitor when the rule is describing the traffic that you
want to monitor and the ACL in which you are creating the rule is applied to the
monitored interface. For more information, refer to the “Flow-based Monitoring” section
in the Port Monitoring chapter of the Dell Networking OS Configuration Guide.
Defaults Not configured.
228 Access Control Lists (ACL)