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Creating Policies Configuring QoS
page 24-28 OmniSwitch 6600 Family Network Configuration Guide April 2006
Layer 3 Rules With Compatible Actions
More than one rule may have the same condition. For example, two Layer 3 rules may have the same IP
address condition but different actions. If the actions are compatible, both rules will be applied to the flow,
regardless of the precedence settings. In this example, the rules are created with the default precedence (0)
value.
-> policy condition X source ip 10.10.2.3
-> policy action Y priority 7
-> policy action Z maximum bandwidth 10m
-> policy rule Rule1 condition X action Y
-> policy rule Rule2 condition X action Z
In this example, when a flow comes into the switch and matches source IP address 10.10.2.3, the switch
will apply both policies (Rule1 and Rule2) to the flow. On the OmniSwitch 6600, a source IP address may
be combined with priority and maximum bandwidth actions at the same time, so both rules are used.
Compatible actions include the following:
Layer 3 Rules With Conflicting Actions
If the actions are in conflict, however, the switch will apply only the rule with the highest precedence. For
example:
-> policy condition X source ip 10.10.2.3
-> policy action W tos 5
-> policy action Z maximum bandwidth 10m
-> policy rule Rule1 condition X action W
-> policy rule Rule2 condition X action Z
In this case, a source IP address condition may be combined with a ToS action or a maximum bandwidth
action but not both at the same time (see “Condition/Action Combinations” on page 24-7). Since these
actions are in conflict, the rule with the highest precedence will be applied instead. In this case, both rules
have the same precedence value (the default, since no precedence is specifically configured). The rule that
was configured first (Rule1) is considered to have the highest precedence and will be used for the flow.
Conflicting actions include the following:
Action Action
ToS priority
802.1p priority
maximum bandwidth priority
maximum bandwidth 802.1p
Action Action
ToS maximum bandwidth
disposition any other action