Dell S3100 Command Line Reference Guide for the Series 9.110.0 - Page 289

Version 9.8(0.0P2) 9.7(0.0) 9.4(0.0) 9.3(0.0) Description Introduced on the S3048-ON. Introduced on the S6000-ON. Added the support for flow-based monitoring on the S4810, S4820T, S6000, and Z9000 platforms. Added the support for logging of ACLs on the S4810, S4820T, and Z9000 platforms. Usage Information When the configured maximum threshold is exceeded, generation of logs is stopped. When the interval at which ACL logs are configured to be recorded expires, the subsequent, fresh interval timer is started and the packet count for that new interval commences from zero. If ACL logging was stopped previously because the configured threshold is exceeded, it is re-enabled for this new interval. 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 • deny - assign a filter to deny IP traffic. • deny udp - assign 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 threshold-in msgs count (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. Access Control Lists (ACL) 289