Trunk port, access port and voice vlan workability with 802.1x closed mode

[getaway51]

Hi,

I was wondering if 802.1x works with these 3 interface config. I noticed tht 3 config work in terms of networking concept. But with 802.1x closed mode, some might work some might not. Is there any reason why?

1)interface GigabitEthernet1/0/1

switchport mode access
switchport voice vlan 3

2)interface GigabitEthernet1/0/1

switchport mode trunk
switchport voice vlan 3

3)interface GigabitEthernet1/0/1

switchport mode trunk

[Colby LeMaire]

802.1x should not be used on trunk ports.  Don't do it.  And if you search for 802.1x supported on trunk ports, you will see many answers saying no and documentation showing the same thing.  Here is just one example:

https://community.cisco.com/t5/policy-and-access/dot1x-on-trunk-port/td-p/2458101

[Jason Kunst · Accepted solution]

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@Colby LeMaire wrote:

802.1x should not be used on trunk ports.  Don't do it.  And if you search for 802.1x supported on trunk ports, you will see many answers saying no and documentation showing the same thing.  Here is just one example:

https://community.cisco.com/t5/policy-and-access/dot1x-on-trunk-port/td-p/2458101

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Also good to reference the wired guide

https://community.cisco.com/t5/security-documents/ise-secure-wired-access-prescriptive-deployment-guide/ta-p/3641515

[getaway51]

Hi,

Is below the best practise switchport config to use for 802.1x activation?

int gix/x/x

switchport mode access

switchport access vlan xx

switchport voice vlan x