If a port is channelized and not all bandwidth is allocated, only the bandwidth represented by the configured channels with queues configured is counted towards the bandwidth represented by the port. Normally, the amount of active bandwidth is considered as opposed to total potential bandwidth for the port when determining the ports fair share. This process is independently performed for both ingress and egress. Once a queue is created for the port, the system will allocate the appropriate amount of buffer space to the port. An active port is considered to be any port that has an active queue associated. The number of ports sharing the same buffer space depends on the type of IOM the pools are being created on and the type of MDAs populated on the IOM. This mechanism takes the buffer space available and divides it into a portion for each port based on the ports active bandwidth relative to the amount of active bandwidth for all ports associated with the buffer space. IOM with multiple MDAs share a buffer space: iom-10g iom3-xp. IOM with each MDA has a dedicated buffer space: iom-20g iom2-20g. Each port gets an amount of buffering which is its fair-share based on the portвЂ™s bandwidth compared to the overall active bandwidth.

The buffer space is portioned out on a per port basis whether one or multiple MDAs share the same buffer space. Interface Named Pools configuration details are located in the Interface CLI portion of this guide. In case a shared queue is configured to use a port named pool, the queue will be considered orphan and will get buffers from access ingress default pool.ДЇor complete QoS configuration details reference the Named Pools section of the Quality of Service Guide. Shared queues cannot be configured to use port pools since they are not port specific queues. Shared queues can be configured to use MDA named pools. SAP shared queues use by default the SAP shared pool a system reserved buffer pool. To check for orphan queues, use the command вЂњshow mda qos ingress orphaned-queuesвЂќ. Network ingress queues configured to use MDA2 named pools will be considered pool orphaned. Even if named pools are configured for MDA 2, they will not be used by network ingress queues. In the case with an IOM with multiple MDAs sharing the same buffer space (iom3-xp, iom-10g), network ingress queues will use only the MDA 1 named pools. Network ingress queues can use either MDA ingress named pools or ingress default pools but not port named pools.

Configuring MDA Policies for Named Pools Mode

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