Extreme Networks ExtremeWare XOS 11.3, Manual

Page: 376 / 698

CLEAR-Flow
ExtremeWare XOS 11.3 Concepts Guide
376
After creating the ACLs that contain CLEAR-Flow rules, and after applying the ACLs to the appropriate
interface, you will enable CLEAR-Flow on the switch. When CLEAR-Flow is enabled, the rules will be
evaluated by the CLEAR-Flow agent on the switch, and if any rules are triggered, the CLEAR-Flow
actions are executed.
To enable CLEAR-Flow, use the following command:
enable clear-flow
When you disable the CLEAR-Flow agent on the switch, CLEAR-Flow sampling stops, and all rules are
left in the current state. To disable CLEAR-Flow, use the following command:
disable clear-flow
NOTE
Any actions triggered while CLEAR-Flow is enabled will continue when CLEAR-Flow is disabled, unless explicitly
stopped.
Displaying CLEAR-Flow Configuration and Activity
To display the state of the CLEAR-Flow agent, any CLEAR-Flow policies on each interface, and the
number of CLEAR-Flow rules, use the following command:
show clear-flow
To display the CLEAR-Flow rules and configuration, use the following command:
show clear-flow [port <port> | vlan <vlanname> | any] {rule <rulename>} {detail}
Or to display all the rules, use the following command:
show clear-flow rule-all
When CLEAR-Flow is enabled, any rules that satisfy the threshold will trigger and take action. To
display the CLEAR-Flow rules that have been triggered, use the following command:
show clear-flow rule-triggered
To display which ACLs have been modified by CLEAR-Flow rules, use the following command:
show clear-flow acl-modified
Adding CLEAR-Flow Rules to ACLs
As described in the chapter about ACLs, each ACL policy file consists of a number of named entries.
Each entry consists of match conditions and actions to take if the entry is matched. CLEAR-Flow builds
on the ACL concept to include rules that are periodically checked, and actions to take if a rule is
triggered. The CLEAR-Flow entries are similar to the ACL entries.
The syntax of a CLEAR-Flow rule entry is:
entry <CLFrulename> <match-type> {
if { <match-conditions>;