Dell S4048-ON - Enabling Flow-Based Monitoring

The ACL agent module saves monitoring details in its local database and also in the CAM region to monitor packets that match the
specied 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 congure the flow-based enable command and do not apply an ACL on the source port or the monitored port, both ow-based
monitoring and port mirroring do not function. Flow-based monitoring is supported only for ingress trac 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 ow-based monitoring and those sessions that are not enabled for ow-based
monitoring. It downloads monitoring conguration to the ACL agent whenever the ACL agent is registered with the port mirroring
application or when ow-based monitoring is enabled.
The show monitor session session-id command has been enhanced to display the Type eld in the output, which indicates
whether a particular session is enabled for ow-monitoring.
Example Output of the show Command
Dell# show monitor session 1
SessID Source Destination Dir Mode Source IP Dest IP DSCP
TTL Drop Rate Gre-Protocol FcMonitor
------ ------ ----------- --- ---- --------- -------- ----
--- ---- ---- ----------- ---------
1 Te 1/2 remote-ip rx Port 0.0.0.0 0.0.0.0 0
0 No N/A N/A yes
Dell#
The show config command has been modied to display monitoring conguration in a particular session.
Example Output of the show Command
(conf-mon-sess-11)#show config
!
monitor session 11
flow-based enable
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 trac that
matches with the rules of the specic 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 specied trac instead of all trac on the interface. This feature is
particularly useful when looking for malicious trac. It is available for Layer 2 and Layer 3 ingress and egress trac. You can specify trac
using standard or extended access-lists.
1 Enable ow-based monitoring for a monitoring session.
138
Access Control Lists (ACLs)