Guest

Cisco uBR7200 Series Universal Broadband Routers

Field Notice: BPI Modems Display the Modem State Incorrectly in the show cable modem Command


February 29, 2000




Products Affected



uBR7223
uBR7246
uBR7246VXR

Problem Description



Affected versions of Cisco IOS® Software for uBR will incorrectly display the state of Data-Over-Cable Systems Interface Specifications (DOCSIS) 1.0 Baseline Privacy Interface (BPI) modems in certain instances when using the show cable modem command. This occurs during traffic encryption keys (TEK) negotiation.

This defect has Cisco bug ID CSCdp66031. If you are a registered CCO user and you have logged in, you can view the bug details.

Background

There are two scenarios when the output from the show cable modem command may show the modem state incorrectly:

  1. The normal flow of a BPI modem coming online is online -> online(pk) online(pt). The modem may incorrectly display online-> reject(pt)-> online(pt). The transient reject(pt) state is benign and does not affect the modem in any way. The state should quickly change to online(pt). This issue will be corrected in Cisco IOS Software Release 12.1(1)T.
  1. Modems that actually are rejected with an invalid TEKs appear to be stuck in the online(pk) state. The modem state flow in this case should be online-> reject(pt); however, the modems are displaying online-> reject(pt)-> online(pk). The modem will remain in reject(pt) for some time until it tries to register again. The modem will continue to move through these same transition states without coming online.



Problem Symptoms

The show cable modem command will display the reject(pt) state before going online(pt). This is a benign message and should be ignored.

The show cable modem command will appear to be stuck in the online(pk) state for a modem that was rejected with an invalid TEK. The modem should instead display a reject(pt) state or go offline.
 

Workaround/Solution

There is no workaround. Cisco IOS Software Release 12.1(1)T will include a fix for this issue.

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) at (800) 553-24HR, (408) 526-7209, or send e-mail to tac@cisco.com