Enabling Flow-Based Monitoring - Dell S4048–ON Configuration Manual

The ACL agent module saves monitoring details in its local database and also in the CAM region to monitor packets that match the
specified criterion. The ACL agent maintains data on the source port, the 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
Dell# show monitor session 1
SessID Source
TTL Drop Rate
------ ------
--- ---- ----
1 Te 1/2
0 No N/A
Dell#
The show config command has been modified to display monitoring configuration in a particular session.
Example Output of the show Command
(conf-mon-sess-11)#show config
!
monitor session 11
source TenGigabitEthernet 1/1 destination TenGigabitEthernet 1/1 direction both
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
Dell# show ip accounting access-list
!
Extended Ingress IP access list kar on TenGigabitEthernet 1/1
Total cam count 1
seq 5 permit ip 192.168.20.0/24 173.168.20.0/24 monitor
Dell#show ipv6 accounting access-list
!
Ingress IPv6 access list kar on TenGigabitEthernet 1/1
Total cam count 1
seq 5 permit ipv6 22::/24 33::/24 monitor

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.
138 Access Control Lists (ACLs)
Destination
Gre-Protocol FcMonitor
-----------
----------- ---------
remote-ip
N/A yes
flow-based enable
Dir Mode Source IP
--- ---- ---------
rx Port 0.0.0.0
Dest IP DSCP
-------- ----
0.0.0.0 0