3Com Router 3000 Ethernet FamilyConfiguration Guide Chapter 3 Congestion Management3Com Corporation3-333.6.5 Applying PolicyThe qos apply policy command maps a policy to an interface. One policy can beapplied on multiple interfaces.Perform the following configuration in interface, subinterface, or ATM PVC view.Table 3-54 Apply a policy to the interface or ATM PVCOperation CommandApply a policy to the interface or ATMPVCqos apply policy policy-name{ inbound | outbound [ dynamic ] }Delete the policy from the interface orATM PVCundo qos apply policy { inbound |outbound }dynamic applies only to the dial or VT interface configured with MP for dynamic policyapplication. Before applying a QoS policy to such a dial or VT interface, use the qosmax-bandwidth command to configure adequate bandwidth for running the policy.I. Applying a QoS policy in interface (except for ATM interface) viewz CBQ could not be applied to an interface encapsulated with X.25 or LAPB.z The VT interface referenced by common physical port and MP can apply the policyconfigured with various features, including remark, car, gts, queue af, queue ef,queue wfq, wred, etc.z The policy configured with TS (e.g. gts) and queue (e.g. queue ef, queue af, queuewfq) features cannot be applied on the inbound interface as the input directionpolicy.z The subinterface does not support queue (e.g. queue ef, queue af, queue wfq)feature but support TS (e.g. gts) and TP (e.g. car). The policy configured with TSand TP can be applied on the sub-interface.II. Applying a QoS policy in subinterface viewWhen configuring an LR or CBQ policy for a subinterface, consider the following:z All QoS restrictions applied to the main interface take effect on the subinterface.z When policy embedding is used, CBQ must be configured in the child policyinstead of the parent policy.z In a QoS policy, LR cannot be configured using the lr percent command.z If queuing is configured on the main interface, it can be FIFO only.z The policy configured on the main interface cannot include LR behaviors.z The sum of the LRs configured for all subinterfaces cannot exceed the availablebandwidth of the main interface. (Available interface bandwidth refers to theinterface bandwidth configured using the qos max-bandwidth command or thephysical interface bandwidth when command is not configured.)
