Administrative Native VLAN Tagging - 3560 to Dell N4032F

[EdLaw]

Hi All,

I am looking at the Port-Channel configurations between these two devices and noticed that on one side it seems Native VLAN tagging is disabled and on the other side it appears to be enabled. Does anyone see an issue with these interface settings? thanks in advance!

Cisco 3560

Name: Po1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational 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: none
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 private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001

#show vlan dot1q tag native
dot1q native vlan tagging is disabled

interface Port-channel1
description Dell_Switch_1
switchport trunk encapsulation dot1q
switchport mode trunk
speed 1000
duplex full
end

Dell N4032F

Port: Po1
VLAN Membership Mode: Trunk Mode
Access Mode VLAN: 1 (default)
General Mode PVID: 1 (default)
General Mode Ingress Filtering: Enabled
General Mode Acceptable Frame Type: Admit All
General Mode Dynamically Added VLANs:
General Mode Untagged VLANs: 1
General Mode Tagged VLANs:
General Mode Forbidden VLANs:
Trunking Mode Native VLAN: 1 (default)
Trunking Mode Native VLAN Tagging: Disabled
Trunking Mode VLANs Enabled: All
Private VLAN Host Association: none
Private VLAN Mapping:
Private VLAN Operational Bindings:
Default Priority: 0

interface port-channel 1
description "Port Channel to Cisco 3560 Switches"
switchport mode trunk

[Cristian Matei · Accepted solution]

Hi,

    Looks like a cosmetic bug to me, in the output, as the feature does not seem to be enabled, based on your output.

Regards,

Cristian Matei.

[andrew.butterworth · Accepted solution]

I agree with Cristian.  Just tried the command on an old 3560 (15.0(2)SE11) and a 3560X running the latest (15.2(4)E9) and its the same output as yours even though native VLAN tagging is disabled in global config.  On a 3650 running IOS-XE 16.12.1 with the same global config however it says its disabled:

Name: Gi1/0/25
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: Off
Access Mode VLAN: 4090 (VMWare-Mgt)
Trunking Native Mode VLAN: 4090 (VMWare-Mgt)
Administrative Native VLAN tagging: disabled
Voice VLAN: none
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: 10,15,25,30,35,52,54,58,63,220,221,697-699,2001,3010,
     4065,4080,4085,4090,4092
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

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

[balaji.bandi]

Not Dell expert, look at the document the behaviour is defulat i guess :

https://www.dell.com/support/article/en-uk/how12148/how-to-configure-switchport-modes-on-dell-networking-n-series-switches?lang=en

[EdLaw]

Thank you for the assistance. Looks like I need to upgrade the firmware on this 3560.

Cisco IOS Software, C3560 Software (C3560-IPBASE-M), Version 12.2(35)SE5, RELEASE SOFTWARE (fc1)

[andrew.butterworth]

Depending on the hardware you will either be limited to 12.2(55)SE12 or 15.0(2)SE11.  The older 100Mbps switches had less Flash so can't go beyond 12.2(55)SE12, the newer switches - mainly the 1Gbps 'G' versions and the V2 100Mbps switches have more Flash and can use 12.2(58)SE and 15.0(2)SE versions.

The text in the release notes reads 

Not all Catalyst 3750 and 3560 switches can run this release.
These models are not supported in Cisco IOS Release 12.2(58)SE1 and later: WS-C3560-24TS,
WS-C3560-24PS. WS-C3560-48PS, WS-C3560-48TS, WS-C3750-24PS, WS-C3750-24TS, WS-C3750-48PS,
WS-C3750-48TS, WS-3750G-24T, WS-C3750G-12S, WS-C3750G-24TS, WS-C3750G-16TD.
For ongoing maintenance rebuilds for these models, use Cisco IOS Release 12.2(55)SE and later
(SE1, SE2, and so on).

Good luck.