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[BTI] Circuit pack degrade alarm on ROB2 and ROB4 modules

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Article ID: KB34698 KB Last Updated: 26 Jun 2019Version: 1.0
Summary:

The ROADM on a Blade (ROB) module on the BTI7000 Series platform (7020, 7060, and 7200) may be seen to raise a non-service-affecting "Circuit pack degrade (REPLUNITDEGRADE) alarm after a couple of years in service. The condition would restrict users from making any provisioning changes until the alarm is cleared.

This article describes the reason for the alarm to be raised and the resolution for the problem.

 

Symptoms:

The alarm is reported against the ROB module, and can be reviewed in ProNX900, TL1, or CLI.

Below is an example of the alarm retrieved from the Command Line Interface (CLI):

 
BTI7000# show alarm all​
Alarm   Equipment   Sev  Date   Time     SA/NSA   Description
------- ----------- ---- ------ -------- -------- ----------------------
Pack    ROB-1/3     Maj  04-24  16:30:19  NSA     Circuit pack degraded 
​​
 

Note: The "Circuit pack degraded" alarm may be raised for numerous reasons. Contact Support to confirm whether the alarm is raised due to a bug via the backdoor procedure.

 

Cause:

This bug pertains to the WSS counter overflow on the ROB card.​ As a result, the WSS module locks the DPRAM interface, which prevents the software from being able to communicate with the card. Consequently, users cannot make any provisioning changes.

The counter overflows after approximately 4.5 years of uninterrupted uptime (in-service), leading to the non-traffic-affecting alarm condition.

A Warm reload does not reset the WSS counter. A Cold reload recovers the WSS module, and resets the counter. However, this will impact traffic for a brief period since the channel attenuation is ramped in software.

 

Solution:

The fix has been implemented in BTI7000 OS release 13.5.

Meanwhile, the condition can be cleared in two ways:

  • Perform a Cold reload on the ROB module, which will clear the WSS buffer and reset the counter.

  • Reset the counter through a non-service-affecting backdoor procedure, which can be performed only by a JTAC engineer.

Note: Cold reload will impact traffic momentarily until the module recovers.

 

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