Disabling Rules; Rule Precedence - Alcatel OmniSwitch 6800 Series Network Configuration Manual

Creating Policies
In addition, a policy rule may be administratively disabled or re-enabled using the policy rule command.
By default rules are enabled. For a list of rule defaults, see
Information about using the policy rule command options is given in the next sections.

Disabling Rules

By default, rules are enabled. Rules may be disabled or re-enabled through the policy rule command using
the disable and enable options. For example:
-> policy rule rule5 disable
This command prevents rule5 from being used to classify traffic.
Note that if qos disable is entered, the rule will not be used to classify traffic even if the rule is enabled.
For more information about enabling/disabling QoS globally, see
page 21-12.

Rule Precedence

All rules that match a flow will be applied to the flow, unless one of the following rule conflicts occur:
Actions specified by one or more rules are in conflict with each other.
•
Conditions specified in one or more contiguous rules are the same.
•
If any of the above items are true, then rule precedence is used to determine which rule to apply to the
flow. (This functionality is different from the OmniSwitch 7700/7800/8800, which will always apply the
rule with the highest precedence.)
See the next sections
Actions" on page 21-29) for more information about precedence and flows. Precedence is particularly
important for Access Control Lists (ACLs). For more details about precedence and examples for using
precedence, see Chapter 22, "Configuring ACLs."
How Precedence is Determined
When there is a conflict between rules, precedence is determined using one of the following methods:
Precedence value—Each policy has a precedence value. The value may be user-configured through
•
the policy rule command in the range from 0 (lowest) to 65535 (highest). (The range 30000 to 65535 is
typically reserved for PolicyView.) By default, a policy rule has a precedence of 0.
Configured rule order—If a flow matches more than one rule and both rules have the same prece-
•
dence value, the rule that was configured first in the list will take precedence.
Note. Minimum bandwidth rules have the highest precedence over all other rules in the system. They are
enforced internally and cannot be overridden by user-configured settings. In addition, specifying a mini-
mum bandwidth value implies a maximum bandwidth of the same value.
page 21-28
("Rules With Compatible Actions" on page 21-29
OmniSwitch 6800 Series Network Configuration Guide
"Policy Rule Defaults" on page
"Enabling/Disabling QoS" on
and "Rules With Conflicting
Configuring QoS
21-9.
November 2004