Reference Guide

destination port, and the endpoint to which the packet must be forwarded when a match occurs with the
ACL entry.
If you configure the flow-based enable command and do not apply an ACL on the source port or the
monitored port, both flow-based monitoring and port mirroring do not function. Flow-based monitoring
is supported only for ingress traffic and not for egress packets.
The port mirroring application maintains a database that contains all monitoring sessions (including port
monitor sessions). It has information regarding the sessions that are enabled for flow-based monitoring
and those sessions that are not enabled for flow-based monitoring. It downloads monitoring
configuration to the ACL agent whenever the ACL agent is registered with the port mirroring application
or when flow-based monitoring is enabled.
The show monitor session session-id command has been enhanced to display the Type field in
the output, which indicates whether a particular session is enabled for flow-monitoring.
Example Output of the show Command
The show config command has been modified to display monitoring configuration in a particular
session.
Example Output of the show Command
The show ip | mac | ipv6 accounting commands have been enhanced to display whether
monitoring is enabled for traffic that matches with the rules of the specific ACL.
Example Output of the show Command
Enabling Flow-Based Monitoring
Flow-based monitoring is supported on the platform.
Flow-based monitoring conserves bandwidth by monitoring only 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 can specify traffic using standard or extended access-lists.
1. Enable flow-based monitoring for a monitoring session.
MONITOR SESSION mode
flow-based enable
2. Define access-list rules that include the keyword monitor. Dell Networking OS only considers port
monitoring traffic that matches rules with the keyword monitor.
CONFIGURATION mode
ip access-list
For more information, see Access Control Lists (ACLs).
3. Apply the ACL to the monitored port.
INTERFACE mode
ip access-group access-list
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Access Control Lists (ACLs)