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doctorchd
6 Indium

PowerConnect 5548: incorrect VLAN trunk configuration when loading config

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Firmware version: 4.1.0.8.

This is how to reproduce the problem:

1) configure 802.1q trunk with native VLAN other then 1, for example:

interface gigabitethernet1/0/1
 switchport mode trunk
 switchport trunk native vlan 30
 switchport trunk allowed vlan add 30,101

2) save switch config on TFTP server or locally via HTTP

in the saved file VLAN configuration on interface looks like this:

interface gigabitethernet1/0/1
 switchport mode trunk
 switchport trunk native vlan 30
 switchport trunk allowed vlan remove 1-29,31-100,102-4094

3) load saved configuration as startup-config

check loaded config ('more  startup-config'):

interface gigabitethernet1/0/1
 switchport mode trunk
 switchport trunk native vlan 30
 switchport trunk allowed vlan none

As a result interface is not operational.

If you edit saved file like this:

 interface gigabitethernet1/0/1
  switchport mode trunk
  switchport trunk native vlan 30
- switchport trunk allowed vlan remove 1-29,31-100,102-4094
+ switchport trunk allowed vlan add 30,101

configuration is loaded correctly.

This looks like not completely fixed bug from 4.1.0.1 when you were getting 'allowed vlan none' also in case of native vlan 1.







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Moderator
Moderator

Re: PowerConnect 5548: incorrect VLAN trunk configuration when loading config

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With these type of VLAN settings you can also use the switch port General mode instead of trunking mode. General mode allows you to be more specific on creating the vlans  and setting what you want to be the native vlan and what you want to set as the tagged vlans.  I recommend to not use trunk mode if you want to specifically assign native vlans beside the default vlan 1.   

The issue you have shown here very well could be an issue in the firmware. To properly document this issue I would suggest calling into support at 1-800-945-3355, Where a case can be opened, documented, and escalated if need be.

Thanks.

Daniel Covey
Dell EMC| Enterprise Support Services
Get support on Twitter:@DellCaresPRO
Download our QRL app:iOS, Android, Windows
Dell Networking Resources

3 Replies
Moderator
Moderator

Re: PowerConnect 5548: incorrect VLAN trunk configuration when loading config

Jump to solution

With these type of VLAN settings you can also use the switch port General mode instead of trunking mode. General mode allows you to be more specific on creating the vlans  and setting what you want to be the native vlan and what you want to set as the tagged vlans.  I recommend to not use trunk mode if you want to specifically assign native vlans beside the default vlan 1.   

The issue you have shown here very well could be an issue in the firmware. To properly document this issue I would suggest calling into support at 1-800-945-3355, Where a case can be opened, documented, and escalated if need be.

Thanks.

Daniel Covey
Dell EMC| Enterprise Support Services
Get support on Twitter:@DellCaresPRO
Download our QRL app:iOS, Android, Windows
Dell Networking Resources

doctorchd
6 Indium

Re: PowerConnect 5548: incorrect VLAN trunk configuration when loading config

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Thanks for the advice. The problem is not critical for me as long as I have a solution. I just hope that this info reaches Dell engineers.

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Moderator
Moderator

Re: PowerConnect 5548: incorrect VLAN trunk configuration when loading config

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I have passed this information along, and hope to see future firmware revision have this resolved.

Thanks

Daniel Covey
Dell EMC| Enterprise Support Services
Get support on Twitter:@DellCaresPRO
Download our QRL app:iOS, Android, Windows
Dell Networking Resources

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