Switchport in Access and Trunk modes

[silks101]

What effect does this have

switchport access vlan 103
switchport mode trunk

as we have it configured on our link ports between 2 switches (which we are having problems with) - I thought it could only be one or the other

Many thanks for your advice

Steve Lindley
CCNA

 

[ADB100]

With IOS-based switches the command 'switchport access vlan xx' sets the access vlan should the port NOT be a trunk. The fact that you have 'forced' the port to be a trunk makes the command redundant until you make the port an access port again. With CatOS switches setting the access vlan of a switchport also sets the native vlan of the port becomes a trunk. With IOS-based switches to set the native vlan use the command 'switchport trunk native vlan xx'. I always set both the access vlan and native vlan the same when configuring trunks with IOS switches.

interface GigabitEthernet5/6
switchport
switchport access vlan 100
switchport trunk encapsulation dot1q
switchport trunk native vlan 100
switchport trunk allowed vlan 119,247
!

Bear in mind there are quite a few differences/limitations with the older IOS-based switches (2900XL & 3500XL).

Andy