Service Manual

The default frequency at which ACL logs are generated is five minutes. By default, flow-based monitoring is not
enabled.
Command Modes CONFIGURATION-IP ACCESS-LIST-STANDARD
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.4(0.0) Added the support for flow-based monitoring on the MXL 10/40GbE Switch IO Module.
9.3(0.0) Added the support for logging of ACLs on the MXL 10/40GbE Switch IO Module.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information
The order option is relevant in the context of the Policy QoS feature only. For more information, refer to the
Quality of Service chapter of the Dell Networking OS Configuration Guide.
You can configure either count (packets) or count (bytes). However, for an ACL with multiple rules, you can
configure some ACLs with count (packets) and others as count (bytes) at any given time.
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 s 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 the specified
traffic instead of 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
ip access-list standard— configures a standard ACL.
permit — configures a MAC address filter to pass packets.
seq — configures 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} [no-drop] [count [byte]] [dscp
value] [order] [fragments] [log [interval minutes] [threshold-in-msgs [count]]
[monitor]
Access Control Lists (ACL) 215