Cisco Bug: CSCtf04012 - Accept Ranging between DCC-RSP (depart) and DCC-RSP (arrive).
Oct 16, 2010
- Cisco uBR10000 Series Universal Broadband Routers
Known Affected Releases
Symptom: 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. Conditions: 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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