topic Re: Detect Cisco device interface linkdown in Extensions

Detect Cisco device interface linkdown

Shirai — Tue, 28 Oct 2025 06:46:45 GMT

I am using the Generic Cisco Device Extension to monitor Cisco devices. I am planning to use a metric event to detect interface link downs. I thought I could achieve this by monitoring the metric "com.dynatrace.extension.network_device.if.status", but the value of this metric is always 1, and Link Up/Down is defined as a dimension. Is it possible to use this metric to detect link downs as a metric event?

Re: Detect Cisco device interface linkdown

p_devulapalli — Tue, 28 Oct 2025 06:08:02 GMT

@Shirai You can use these

Key: oper.status
Usage: The operational state of the interface (up/down/etc.).
Key: admin.status
Usage: The admin state of the interface (up/down/etc.).

Re: Detect Cisco device interface linkdown

Shirai — Wed, 29 Oct 2025 00:30:54 GMT

@p_devulapalli-san. Thanks for the reply.

I understand that oper.status indicates Link up/down, but I don't know how to define a change in oper.status as a metric event.

I tried the metric event setting screen below, but I was unable to set "oper.status" in the Metric key field.

Re: Detect Cisco device interface linkdown

p_devulapalli — Wed, 29 Oct 2025 03:33:20 GMT

@Shirai You can use the Dimension Filter along with monitoring strategy to set the threshold , please see below example

Re: Detect Cisco device interface linkdown

Shirai — Wed, 29 Oct 2025 04:58:54 GMT

@p_devulapalli

Let me ask a few more questions. In the configuration you provided, the Dimension value is set to "up(1)". In this case, will it detect a link up or a link down?