| CPC H04L 67/146 (2013.01) [H04L 41/04 (2013.01); H04L 67/55 (2022.05)] | 20 Claims |

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1. A method for device management by a first network management device, the method comprising:
obtaining, by the first network management device, subscription parameter information expressed in a YANG data model, wherein the subscription parameter information expressed in the YANG data model indicates a subscription parameter used during a process of establishing a first subscription session indicating a first network device to send subscription data to a network management device managing the first network device;
after the first network management device having determined that the first subscription session is interrupted, generating, by the first network management device, a request message comprising the subscription parameter information for establishing a second subscription session indicating a network device managed by the first network management device to send subscription data to the first network management device; the network device comprising a second network device or the first network device; and
sending, by the first network management device, the request message to the network device managed by the first network management device to establish the second subscription session between the network device and the first network management device without manual configuration.
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