Description: The maximum shaping delay in milliseconds. That is, the maximum amount of time for which the HE will allow buffering of any rate exceeded flow. If the max buffering delay is large, then grants/packets of the flow will be buffered for a longer period of time even though the flow is rate exceeded. This means fewer chances of drops for such rate exceeded flow. However, too large a max shaping delay can result in quick drainage of packet buffers at the HE, since several packets will be in the shaping (delay) queue waiting for their proper transmission time. Another important point to note is that delaying a flow's packets (especially TCP flows) for extended periods of time may be counter- productive, since the higher protocol layers may assume a packet loss after a certain amount of time.

The maximum shaping delay is only applied to rate limit algorithm: Token bucket algorithm with shaping. If the rate limit algorithm is not Token bucket algorithm with shaping, the value is always na(1) which is not applicable. In this case, you will be allowed to set the value to na(1) only.

If the token count is less than the size of request/packet, HE computes the shaping delay time after which the deficit number of tokens would be available. If the shaping delay time is greater than the maximum shaping delay, the request/packet will be dropped.

The enumerations for cwdxQosIfRateLimitShpMaxDelay are: na(1): maximum shaping delay is not applied to the current rate limit algorithm msec128(2): maximum shaping delay is 128 milliseconds msec256(3): maximum shaping delay is 256 milliseconds msec512(4): maximum shaping delay is 512 milliseconds msec1024(5): maximum shaping delay is 1024 milliseconds

At the downstream, cwdxQosIfRateLimitShpMaxDelay is configurable and the default value is msec128(2). Whenever the downstream rate limit algorithm is changed to Token bucket algorithm with shaping from other rate limit algorithm, the value will be reset to the default value.

At the upstream, cwdxQosIfRateLimitShpMaxDelay is not configurable and it is read-only value.