End devices need running under VLAN

[machiasiaweb]

Hello,

I have some PC which require running in environment with VLAN.  However, some of them could not configure with VLAN tag but some can.  So simple drawing

PC (cannot config VLAN) <-----> CISCO 2960 <-----> Server (can support VLAN tag)

How should I config it? Example

!PC

interface FastEthernet0/9

switchport access vlan 20

switchport mode access

!Server

interface FastEthernet0/9

switchport access vlan 20

switchport mode access

or

interface FastEthernet0/9

switchport mode truck

switchport trunk allowed vlan 20

Thanks!

[darren.g]

Machi Ma wrote:
Hello,
I have some PC which require running in environment with VLAN.  However, some of them could not configure with VLAN tag but some can.  So simple drawing
PC (cannot config VLAN) <-----> CISCO 2960 <-----> Server (can support VLAN tag)
How should I config it? Example 
!PC
interface FastEthernet0/9
 switchport access vlan 20
 switchport mode access
!Server
interface FastEthernet0/9
 switchport access vlan 20
 switchport mode access
or 
interface FastEthernet0/9
 switchport mode truck
 switchport trunk allowed vlan 20
Thanks!

Generally speaking, there should be no need to configure a VLAN tag on an end device such as a PC or server *unless* that device runs some form of VM or multiple-machine and has a virtual NIC or trunk requirement.

You should just be able to configure both your PC and your server with an IP address and no VLAN tag, and plug them into access ports such as your first example.

*If* your server does need multiple VLAN's on the one physical NIC (and supports VLAN tagging), then you need a combination of your two scenarios - configure your PC as an access port in VLAN 20, and your server port as a trunk with VLAN20 as an allowed VLAN, then configure your server VNIC with VLAN 20 and an appropriate IP address.

The only time you should need the latter is if you're doing virtualisation on your server, and need servers in different VLAN's for some reason. Otherwise two access ports should just work - as long as you DON'T tell your server to add a VLAN tag.

Cheers.

[machiasiaweb]

Hello,

Thanks for your suggestion.  I will try it. 

Additional question is that PC also require to access another VLAN say VLAN 30.  That means access VLAN 20 and VLAN 30 too.  How should I config in switch?

Thanks!

[darren.g]

Machi Ma wrote:
Hello,
Thanks for your suggestion.  I will try it.  
Additional question is that PC also require to access another VLAN say VLAN 30.  That means access VLAN 20 and VLAN 30 too.  How should I config in switch?
Thanks!

The PC needs to only be in one VLAN. Routing between VLAN's should be done either via an SVI on the switch (interface VLAN20 and interface VLAN30 rather than VLAN20 and VLAN30), or via an external router which is connected to each VLAN.

[pjmonline]

Pc should only be in one Vlan. That Vlan should be routed by layer 3 switch or router to the other Vlan.

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