[j-nsp] Re: VLAN tagging

[Daniel Roesen]

On Tue, Jan 18, 2005 at 04:35:42PM +1300, Thomas Salmen wrote:
> On a Cisco router, it is possible to do this:
> 
> interface FastEthernet4/0
>  ip address 192.168.1.1 255.255.255.252
> !
> interface FastEthernet4/0.100
> encapsulation dot1Q 100
>  ip address 10.100.100.1 255.255.255.252
> !
> interface FastEthernet4/0.200
> encapsulation dot1Q 200
> ip address 10.200.200.1 255.255.255.252
> 
> That is, add VLAN-tagged logical subinterfaces to a non-tagged physical
> interface.
> 
> Does anyone know if this can be duplicated on an M-series?

No, impossible. An ethernet interface with enabled vlan-tagging does
tag each and every VLAN. You can't send untagged frames with that.

You'll need to adapt your trunk to tag anything. JunOS has no concept
of "native" (untagged) VLAN.


Best regards,
Daniel

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