Single trunk port can't access any Vlans

[AnthonySMillsIT]

Can anyone help me with this issue. I have all interfaces on a 24 port switch programed the same, but I get these random single ports that can't access anything on the network. You can see in this example port 5 is configured the same as the ones around it, but it doesn't show in vlan 1 or 100. Catalyst 2960x if that helps.

[M02@rt37]

Hello @AnthonySMillsIT 

Ensure that port Gi 1/0/5 is up ! Check witch #show interface status command.

[AnthonySMillsIT]

It is connected, vlan trunk. But not passing any traffic.

[acampbell]

Hi.

When you look at you show vlan output, although you are seeing the interface gi1/0/5 as UP
the port has not joined any vlan.

Has the end device lost its settings/config ? - Is it sending in any packets with a valid MAC ?

Also this seems the old way to build port configs for Voice & Data type ports, now-a-days we usuallly use
somthing like this:-

!
int g1/0/5
switchport
switchport host
switcport access vlan XXX
switchport voice vlan YYY
desc PC & Voice Port
!

Hope this helps

[Martin L]

who/what is connected to it and show us show interface Gi1/0/5 switchport 

Regards, ML
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[AnthonySMillsIT]

Windows 10 machine, no end user. Going to sit in the server room and be used for a quick glace monitoring of our remote site's comms.

#show interface gi1/0/5 switchport
Name: Gi1/0/5
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: 100 (VLAN0100)
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none

[Martin L]

interface is down; see Operational Mode: down above; User probably turn PC off ? is there a IP phone also ?  once port is up, use show mac-address interface xyz to see if there are 1 or 2 MACs  (of phone and PC)

use show interface status and show interface status err-disable for more info

Regards, ML
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