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Monitoring Support for LTE Links on Dual CPEs

date_range 07-Jul-22

In single CPE deployments, when an LTE link goes down a critical alarm is generated. This behavior remains the same in dual CPE deployments if the LTE Mini-PIM is installed in only one node.

In dual CPE deployments with the LTE Mini-PIM installed in both the nodes, the Mini-PIMs operate in active / backup mode. By default, the LTE links are non-revertive—when a preferred active link goes down and the backup link becomes the active link, the backup link continues to be the active link until it fails. The preferred active link does not become the active link until the current active link fails. For example, consider a dual CPE deployment in which the LTE link on node 0 is preferred active. If the LTE link on node 0 fails, then the LTE link on node 1 becomes the active link. Now, even if the LTE link on node 0 becomes operational after some time, it does not become the active link. The link on node 1 continues to be the active link until it fails, at which point the node 0 link becomes the active link again.

When both the LTE links fail, CSO generates a critical alarm. If you configured the node 0 LTE link as the preferred active and node 1 LTE link becomes active, CSO generates a major alarm to indicate that the user preference is node 0 but the active LTE is on node 1. If the LTE link on node 0 becomes operational again, it does not automatically become active because of the non-revertive nature. As a result, CSO does not clear the alarm until the preferred active LTE link becomes active again.

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