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The show trunk detail command shows the unknown status in Cisco Catalyst switches running CatOS system software

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Core issue

The unknown status is displayed by the show trunk [mod/port] detail command in these fields:

  • peer-port

  • mode

  • encapsulation

  • status

Sample output:

Switch (enable) show trunk 2/1 detail
* - indicates vtp domain mismatch
Port  Mode  Encapsulation  Status  Native
vlan
--------  -----------  -------------  ------------  -----------
2/1  auto  dot1q  not-trunking  15

Port  Peer-Port  Mode  Encapsulation  Status
--------  ---------  -----------  -------------  ------------
2/1  unknown  unknown  unknown  unknown
 

This is only a cosmetic issue and does not affect network functioning. The trunk link is up and passes traffic.

Resolution

In the show trunk detail command output, the Peer-Port field displays either the module and port number of the peer connection, or multiple or unknown. Multiple is displayed if connected to shared media, and unknown is displayed if Dynamic Trunking Protocol (DTP) does not run on the other side.