Enabling Flow-Based Monitoring - Dell S4048T Configuration Manual

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.
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
3 Apply the ACL to the monitored port.
INTERFACE mode
ip access-group access-list
Example of the flow-based enable Command
To view an access-list that you applied to an interface, use the show ip accounting access-list
command from EXEC Privilege mode.
Dell(conf)#monitor session 0
Dell(conf-mon-sess-0)#flow-based enable
Dell(conf)#ip access-list ext testflow
Dell(config-ext-nacl)#seq 5 permit icmp any any count bytes monitor
Dell(config-ext-nacl)#seq 10 permit ip 102.1.1.0/24 any count bytes monitor
Dell(config-ext-nacl)#seq 15 deny udp any any count bytes
Dell(config-ext-nacl)#seq 20 deny tcp any any count bytes
Dell(config-ext-nacl)#exit
Access Control Lists (ACLs).
Access Control Lists (ACLs) 171