Reason for unavailability of the secondary gateway

Question:
Question: When NEs A and B are forcibly switched to secondary GNE C, the NEs become unreachable, namely the secondary gateway is not available.
Analysis:
1. When the primary GNE is used, the NEs are reachable. This means that the system control boards and software are normal, as well as the communication parameters. 2. The maximum number of route hops is 20, which is smaller than the actual value, resulting in the failure in backup route search. 3. The maximum number of route hops should be set to the default value 64, and the issue will be resolved.
Root cause:
The maximum number of route hops was set to 20 for NEs A and B. The actual number of hops between NEs and the GNE is greater than 20, resulting in the failure in locating the backup route and communication.
Answer:
The maximum number of route hops should be set to the default value 64, and the issue will be resolved.
Suggestion and conclusion:
Common causes for unreachable NEs are: incorrect communication parameters (NEID, subnet mask, or ECC modes), constant reset of the system control boards resulting in communication failures, and excessively large scale of the automatically extended ECC resulting in network instability.

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