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Using Condition Groups in Policies Configuring QoS

page 26-42 OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006

This command specifies that port 2/1 will be deleted from the techpubs port group at the next qos apply.

To delete a port group, use the no form of the policy port group command with the relevant port group

name. The port group must not be associated with any policy condition. For example:

-> no policy port group techpubs

The port group techpubs will be deleted at the next qos apply. If techpubs is associated with a policy

condition, an error message will display instead:

ERROR: techpubs is being used by condition 'cond4'

In this case, remove the port group from the condition first; then enter the no policy port group

command. For example:

-> policy condition cond4 no source port group

-> no policy port group techpubs

The policy condition command removes the port group from the policy condition. (See “Creating Policy

Conditions” on page 26-27 for more information about configuring policy conditions.) The port group will

be deleted at the next qos apply.

Port Groups and Maximum Bandwidth

Maximum bandwidth policies are applied to source (ingress) ports and/or flows. If a port group condition

is used in the policy, the bandwidth value specified is shared across all ports in the group.This also applies

to flows that involve more than one port. For example, if a policy specifies a maximum bandwidth value

of 10M for a port group containing 4 ports, the total bandwidth limit enforced is 10M for all 4 ports.

Note the following when configuring ingress maximum bandwidth policies:

• On an OmniSwitch 6800 switch, bandwidth shaping is done on a per port basis and is not shared across

multiple ports.

• If a policy condition applies to ports that are located on different slots, the maximum bandwidth limit

specified is multiplied by the number of slots involved. For example, if a rule is configured to apply a

maximum bandwidth limit of 10M to ports 1/1, 3/10, and 4/5, then the actual bandwidth limit enforced

for all three ports is 30M.

• The maximum traffic received by a destination port is also dependant on how many slots are sending

traffic to the destination port. However, each slot is restricted to sending only 10k.

• If a policy condition applies to ports that are all on the same slot, then the maximum bandwidth value

specified in the rule is not increased.

• Ingress bandwidth limiting is done using a granularity of 64K bps.

• The show active policy rule command displays the number of packets that were dropped because they

exceeded the ingress bandwidth limit applied by a maximum bandwidth policy.

Egress Bandwidth Shaping

To limit the bandwidth on egress ports, use the qos port maximum bandwidth command. For example,

-> qos port 1/1 maximum bandwidth 10k

Note the following when configuring a bandwidth limit for egress ports:

• Egress bandwidth limiting is done using a granularity of 64K bps.

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