# Detect Cisco device interface linkdown

**URL:** <https://community.dynatrace.com/t/detect-cisco-device-interface-linkdown/53883>\
**Category:** Extensions\
**Tags:** cisco, extensions\
**Created:** [October 28, 2025, 2:41am UTC](https://community.dynatrace.com/t/detect-cisco-device-interface-linkdown/53883 "2025-10-28T02:41:58Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Shirai](https://dub1.discourse-cdn.com/dynatrace/user_avatar/community.dynatrace.com/shirai/32/27711_2.png) [@Shirai](https://community.dynatrace.com/u/Shirai)\
**Post date:** [October 28, 2025, 2:41am UTC](https://community.dynatrace.com/t/detect-cisco-device-interface-linkdown/53883/1 "2025-10-28T02:41:58Z")

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Hi

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?

 ![Shirai_0-1761619026349.png](https://global.discourse-cdn.com/dynatrace/original/3X/b/5/b571d090714ce305274fe818db300bedfa6e788f.png)

 ![Shirai_1-1761619173037.png](https://global.discourse-cdn.com/dynatrace/original/2X/6/64922bbfbc886e1115d305c37e384538e0d61dd5.png)

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**Author:** ![p\_devulapalli](https://dub1.discourse-cdn.com/dynatrace/user_avatar/community.dynatrace.com/p_devulapalli/32/41590_2.png) [@p\_devulapalli](https://community.dynatrace.com/u/p_devulapalli)\
**Post date:** [October 28, 2025, 6:08am UTC](https://community.dynatrace.com/t/detect-cisco-device-interface-linkdown/53883/2 "2025-10-28T06:08:02Z")

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[@Shirai](https://community.dynatrace.com/user/32074)&nbsp;You can use these

- Key:&nbsp;oper.status

- Key:&nbsp;admin.status

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<div class="post-metadata">

**Author:** ![Shirai](https://dub1.discourse-cdn.com/dynatrace/user_avatar/community.dynatrace.com/shirai/32/27711_2.png) [@Shirai](https://community.dynatrace.com/u/Shirai)\
**Post date:** [October 29, 2025, 12:30am UTC](https://community.dynatrace.com/t/detect-cisco-device-interface-linkdown/53883/3 "2025-10-29T00:30:54Z")

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[@p\_devulapalli](https://community.dynatrace.com/user/21657)-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.

 ![Shirai_0-1761697477351.png](https://global.discourse-cdn.com/dynatrace/original/3X/5/6/566480ff3f0af3864c8d8a8a5abf1f4952138987.png)

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<div class="post-metadata">

**Author:** ![p\_devulapalli](https://dub1.discourse-cdn.com/dynatrace/user_avatar/community.dynatrace.com/p_devulapalli/32/41590_2.png) [@p\_devulapalli](https://community.dynatrace.com/u/p_devulapalli)\
**Post date:** [October 29, 2025, 3:31am UTC](https://community.dynatrace.com/t/detect-cisco-device-interface-linkdown/53883/4 "2025-10-29T03:31:57Z")

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[@Shirai](https://community.dynatrace.com/user/32074)&nbsp;You can use the Dimension Filter along with monitoring strategy to set the threshold , please see below example

 ![p_devulapalli_2-1761708782318.png](https://global.discourse-cdn.com/dynatrace/original/3X/3/9/3970129fb94e0a07d741a38eb3133d3b4f92535a.png)

 ![p_devulapalli_0-1761708595546.png](https://global.discourse-cdn.com/dynatrace/original/3X/b/1/b166be47ca8e8510438df4428e4708f35369b43e.png)

 ![p_devulapalli_1-1761708639179.png](https://global.discourse-cdn.com/dynatrace/original/3X/d/f/df8335eba82e373c926bab7f1c4a3d443e5f20e6.png)

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<div class="post-metadata">

**Author:** ![Shirai](https://dub1.discourse-cdn.com/dynatrace/user_avatar/community.dynatrace.com/shirai/32/27711_2.png) [@Shirai](https://community.dynatrace.com/u/Shirai)\
**Post date:** [October 29, 2025, 4:58am UTC](https://community.dynatrace.com/t/detect-cisco-device-interface-linkdown/53883/5 "2025-10-29T04:58:54Z")

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[@p\_devulapalli](https://community.dynatrace.com/user/21657)

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?