through the ingress interfaces are examined, and appropriate ACLs can be applied in the ingress direction. By
default, flow-based monitoring is not enabled.
You must specify the monitor option with the permit, deny, or seq command for ACLs that are assigned to
the source or the monitored port (MD) to enable the evaluation and replication of traffic that is traversing to
the destination port. Enter the keyword monitor with the seq, permit, or deny command for the ACL rules
to allow or drop IPv4, IPv6, ARP, UDP, EtherType, ICMP, and TCP packets. The ACL rule describes the traffic
that you want to monitor, and the ACL in which you are creating the rule will be applied to the monitored
interface. Flow monitoring is supported for standard and extended IPv4 ACLs, standard and extended IPv6
ACLs, and standard and extended MAC ACLs.
CONFIG-STD-NACL mode
seq sequence-number {deny | permit} {source [mask] | any | host ip-address} [count
[byte]] [order] [fragments] [log [threshold-in-msgs count]] [monitor]
If the number of monitoring sessions increases, inter-process communication (IPC) bandwidth utilization will
be high. The ACL manager might require a large bandwidth when you assign an ACL, with many entries, to an
interface.
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(conf-mon-sess-0)#do show monitor session 0
SessID Source Destination Dir Mode Source IP Dest IP
------ ------ ----------- --- ---- --------- --------
0 Te 1/1 Te 1/2 rx Flow N/A N/
A
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
flow-based enable
Access Control Lists (ACLs) 170
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