Administrator Guide

Flow-based monitoring is supported for SPAN, RSPAN, and ERSPAN sessions. If there are overlapping rules between ACLs applied on
different monitor sessions, the session with the highest monitor session ID takes precedence.
NOTE: You can apply only IPv4 ACL rules under monitor session context.
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 is 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 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.
You cannot apply the same ACL to an interface or a monitoring session context simultaneously.
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 displays the Type field in the output, which indicates whether a particular
session is enabled for flow-monitoring.
Example Output of the show Command
DellEMC# 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
DellEMC#
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
source TenGigabitEthernet 1/1 destination TenGigabitEthernet 1/1 direction both
The show ip 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
DellEMC# 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
DellEMC#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
Access Control Lists (ACLs)
123