cdxQosIfRateLimitShpMaxDelay

The maximum shaping delay in milliseconds. That is, the maximum 
amount time of buffering the CMTS will allow for any rate exceeded 
flow.  If the max buffering delay is large, the 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 is quick drainage of packet buffers at the CMTS, since 
several packets will be in the shaping (delay) queue waiting for 
their proper transmission time. Another important point to be noted 
is that delaying a flows packets (especially TCP flows) for 
extended periods of time is useless, 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.
              
If the token count is less than the size of request/packet, CMTS 
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 maximum shaping delay 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 
              
The downstream maximum shaping delay 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. 
              
The upstream maximum shaping delay is not configurable and it 
is read-only value.

MIB

CISCO-DOCS-EXT-MIB

OID

.1.3.6.1.4.1.9.9.116.1.1.2.1.3

Type

column

Access

readwrite

Status

current

Parent

cdxQosIfRateLimitEntry

Table

cdxQosIfRateLimitTable

Siblings

3