Description

The intention of the article is to provide a solution when below alarms are encountered on the box. 

show chassis alarms
May 24 05:35:13
1 alarms currently active
Alarm time       Class Description
2024-05-24 04:33:12 UTC Major Host 0 igb0 : Ethernet Link to other RE Down

Symptoms

Customer encountered the above alarms on the box after a scheduled maintenance to reseat the Backup RE . 
igb0 is an internal interface used for communication between the Master RE and Remote CB .  

image.png
The issue could be either on the Master RE or Remote CB. Collect below logs to check further. 
  • Collect Host Logs from both the RE's. 
  • From the Host logs check if eth2 interface is up or not. Eth2 is the NIC on the RE connecting to the remote CB.
  • Below logs from Host logs of Master RE confirmed that ETH2 came up during the RE reseat.
2024-05-24T04:33:12.897304+00:00 re0 kernel: igb 0000:01:00.1 eth2: igb: eth2      NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX

Solution

To confirm the issue which component is faulty , try below steps.
  1. Reseat the Backup RE again. Check if the alarms clear or not.
  2. If it doesn’t clear then proceed with CB1 reseat and check if that clears the alarm or not.
  3. If CB1 reseat also doesn’t help to clear then check if we have CB2 present on the box or not . If present swap CB2 with CB1 and then check if the alarm gets cleared or not.
  4. If the above steps doesn’t help then the problem is on the Master RE itself. Replacing the Master RE should clear the alarm. 

Modification History

2024-06-20 : Article Created