Hello, everyone.
I'd like to introduce you how to troubleshoot registration failures of voice service boards on an optical network unit (ONU) because the CPU usage on the ONU control board is too high.
Fault Description
The ASNB voice service boards on multiple newly deployed ONUs occasionally fail to register with the control boards, and a large number of too high CPU usage alarms are generated on these ONUs.
Possible Causes
The control board CPU usage is too high. Therefore, the control boards fail to respond to the registration requests from the ASNB voice service boards.
Handling Procedure
1. Log in to the ONU to check the Address Resolution Protocol (ARP) entries. It is found that the ONU has learned a large number of ARP entries.
MA5620#display arp
{ aging-time|all|dynamic|ip_addr|static|vlan }:all
{ || }:
command:
display arp all
ip address mac address vlan id port ont type
10.11.32.1 0018-742d-a800 300 0/0 /1 - dynamic
10.11.24.1 0018-742d-a800 4001 0/0 /1 - dynamic
10.11.32.77 286e-d4ce-b15c 300 0/0 /1 - dynamic
10.11.39.156 781d-ba5b-da44 300 0/0 /1 - dynamic
--- 237 entries found ---
2. Analyze the ARP packet processing mechanism. The ARP packets need to be processed by the CPU. Therefore, it is suspected that the CPU usage becomes too high after processing a large number of ARP packets.
3. Delete associated service links on the optical line terminal (OLT) and then log in to the ONU 5 minutes later. It is found that the service boards can register with the control board successfully.
Thanks.
