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Cisco Bug: CSCvs46644 - C9200L connected to each other not able not link up when using the same interface ID on both sides

Last Modified

Oct 28, 2020

Products (2)

  • Cisco LAN Switch Software
  • Cisco Catalyst 9300 Series Switches

Known Affected Releases

16.12.3 16.12.4 17.2.1 17.3.1 Amsterdam-17.2.1

Description (partial)

Link between C9200L switches is not coming up when using the same interface ID on both sides:


C9200L -- Gi1/0/1 ------ Gi1/0/1 -- C9200L
C9200L -- Gi1/0/5 ------ Gi1/0/5 -- C9200L
C9200L -- Gi1/0/15 ------ Gi1/0/15 -- C9200L

You'll see the following logs for the interfaces in use, i.e.:

**In this case we were using Gi1/0/36 on both sides**

*Jun 22 20:58:38.877: %ILPOWER-5-DETECT: Interface Gi1/0/36: Power Device detected: Cisco PD
*Jun 22 20:58:39.686: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/36: PD removed

Both switches running 16.12.3 / 16.12.3a.

The link is using the same interface ID on both sides.

Issue specific to C9200L switches.
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