Dell S3100 EMC Command Line Reference Guide for the Series 9.14.2.1 - Page 314

If ACL logging is stopped because the configured threshold is exceeded, it is re-enabled after the logging interval period elapses. ACL logging is supported for standard and extended IPv4 ACLs, IPv6 ACLs, and MAC ACLs. You can configure ACL logging only on ACLs that are applied to ingress interfaces; you cannot enable logging for ACLs that are associated with egress interfaces. You can activate flow-based monitoring for a monitoring session by entering the flow-based enable command in the Monitor Session mode. When you enable this capability, traffic with particular flows that are traversing through the ingress and egress interfaces are examined and, appropriate ACLs can be applied in both the ingress and egress direction. Flow-based monitoring conserves bandwidth by 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 • permit - configure a MAC address filter to pass packets. • seq - configure a MAC address filter with a specified sequence number. permit (for Standard IP ACLs) To permit packets from a specific source IP address to leave the switch, configure a filter. Syntax permit {source [mask]| any | host ip-address} [count [byte]] [dscp value] [order] [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 permit {source [mask] | any | host ip-address} command. Parameters Defaults log threshold-in msgs count interval minutes monitor (OPTIONAL) Enter the keyword log to enable the triggering of ACL log messages. (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. (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. (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. 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. By default, flow-based monitoring is not enabled. Command Modes CONFIGURATION-STANDARD-ACCESS-LIST 314 Access Control Lists (ACL)