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Cisco Bug: CSCtf04012 - Accept Ranging between DCC-RSP (depart) and DCC-RSP (arrive).

Last Modified

Oct 16, 2010

Products (1)

  • Cisco uBR10000 Series Universal Broadband Routers

Known Affected Releases


Description (partial)

In very rare instances, a modem may transmit a RNG-REQ on its old UPSTREAM 
after transmitting a DCC-RSP (depart), but before a DCC-RSP (arrive).  At 
this time, the CMTS is not equipped to receive this RNG-REQ on the old 
channel and if the DCC change is in the same MAC domain, CMTS will send a RNG-
RSP (abort) message.  The CMTS may send out that RNG-RSP (abort) message 
BEFORE or AFTER the DCC-RSP (arrive) is received, therefore it depends on 
timing as to whether or not the CMTS counts the DCC transaction as a success 
or failure.

CM may send RNG-REQ on old UPSTREAM after sending DCC-RSP (depart) but before 
DCC-RSP (arrive).  If US change does not occur during DCC transaction, this 
problem may still occur since the old DS channel ID may be used in the RNG-
REQ between the DCC-RSP (depart) and (arrive).

Whether or not the DCC transaction counts as a success or failure (according 
to the CMTS) depends on whether or not the RNG-RSP (abort) is sent out before 
or after the DCC-RSP (arrive) message is transmitted by the CM.
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Bug Details Include

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  • Status
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