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[Junos] Major alarm 'Host 1 ECC 53 parity error' generated during dual Routing-Engine software upgrade

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Article ID: KB21580 KB Last Updated: 04 Mar 2017Version: 2.0
Summary:
A system alarm is always present on the primary RE, when Junos 10.4R3 is loaded on a node that has two Routing-Engines, and the second RE has an older version of Junos software loaded (for instance 10.4R2).
Symptoms:
When Junos 10.4R3 is loaded on a node that has two Routing-Engines, and the second RE has an older Junos software loaded (for instance 10.4R2), the following system alarm is always present on the primary RE:
user@router>show system alarms | no-more

1 alarms currently active
Alarm time Class Description
2011-04-dd hh:mm:ss CEST Major Host 1 ECC 53 parity error
A Red LED is turned on in the RE1 chassis.

In the 'messages' logs, we see the turning on of red LED for RE1:

Mar 31 20:29:35 router alarmd[1405]: Alarm set: RE color=RED, class=CHASSIS, reason=Host 1 ECC 53 parity error
Mar 31 20:29:35 router craftd[1406]: Major alarm set, Host 1 ECC 53 parity error

Solution:
The alarm refers to an ECC memory parity error on the other RE, which in this case is RE1. The alarm is harmless and does not affect operation. To get rid of this alarm and turn off the red LED, you need to load the Junos 10.4R3 build on the other RE. This always gets rid of the alarm.

It can be said that the alarm has no consequences and is acceptable. When the other RE eventually has the 10.4R3 Junos software loaded and the time comes to activate GRES, the alarm disappears. But during Junos software upgrade at a customer location, there is always a possibility of the backup RE staying on the older software, in case a switchover is needed.

Other observations:
  1. The alarm is not present on nodes with only one RE.
  2. This type of alarm has never been seen on 9.x or 10.2 Junos software.



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