There are two types of buffer allocations – hard buffers, which are explicitly reserved for the queue and soft buffers, which is available for other ports when unused by a given port.
By default, queue 0 will be given 40% of the buffers that are available for the interface as hard buffers i.e. 120 buffers are allocated for queue 0 in the context of 1G ports an 720 buffers in the context of 10G ports .
The softmax for this queue is set to 480 (calculated as 120 * 400/100) for 1GB ports and 2880 for 10GB ports, where 400 is the default max threshold that is configured for any queue.
Queue 1 does not have any hard buffers allocated. The default soft buffer limit is set to 400 (which the max threshold). The threshold would determine the maximum number of soft buffers that can be borrowed from the common pool. The show command that can be used to see this allocation is ‘show platform qos queue config <interface>’.
