Reference Guide

monitoring only specified traffic instead all traffic on the interface. This feature is
particularly useful when looking for malicious traffic. It is available for Layer 2 and
Layer 3 ingress and egress traffic. You may specify traffic using standard or
extended access-lists. This mechanism copies all incoming or outgoing packets on
one port and forwards (mirrors) them to another port. The source port is the
monitored port (MD) and the destination port is the monitoring port (MG).
Related
Commands
deny — assigns a filter to deny IP traffic.
deny udp — assigns a filter to deny UDP traffic.
deny udp (for Extended IP ACLs)
To drop user datagram protocol (UDP) packets meeting the filter criteria, configure a filter.
Syntax
deny udp {source mask | any | host ip-address} [operator port
[port]] {destination mask | any | host ip-address} [dscp]
[operator port [port]] [count [byte]] [order] [fragments] [log
[interval minutes] [threshold-in-msgs [count]]
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 udp {source mask | any | host ip-address}
{
destination mask | any | host ip-address} command.
Parameters
log (OPTIONAL) Enter the keyword log to enable the triggering
of ACL log messages.
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 time interval range is from 1 to 10 minutes.
Defaults By default, 10 ACL logs are generated if you do not specify the threshold explicitly.
The default frequency at which ACL logs are generated is five minutes.
Command
Modes
CONFIGURATION-EXTENDED-ACCESS-LIST
Command
History
Version 9.3(0.0) Added support for logging of ACLs on the S4810, S4820T,
and Z9000 platforms.
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Access Control Lists (ACL)