Dell S4820T, Configuration Manual

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The
show config
command has been modified to display monitoring configuration in a particular
session.
Example Output of the
show
Command
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 S4820T 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 Access Control Lists (ACLs) .
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
164
Access Control Lists (ACLs)