I need to configure a subinterface eg g0/0.1 and g0/0.2 with a untagged VLAN for each subinterface on a Cisco 2821.
My configuration is:
Interface giga 0/0.1
encapsulation dot1q 10
In address 10.0.0.1 255.255.255.0
Interface giga 0/0.2
encapsulation dot1q 20
In address 220.127.116.11 255.255.255.0
With this configuration the IP Address is not reachable from any Clients.
untagged VLAN on subinterface Cisco 2821
It is possible and can you help me for the right configuration?
Since you are using one physical interface (gig0/0) with 2 different vlans (10,20) and subnets, than you need to tag them. If you don't want to tag them, than use one physical interface for one vlan/subnet and another one for the other vlan/subnet.
Dan has provided a good solution for one subnet/VLAN. But if I understand the original post correctly then Mirko wants both of the VLANs untagged. And I do not believe that this is possible. The trunking protocol allows for only a single untagged VLAN on the trunk.
Maybe you can elaborate on why you think you need both of these subs untagged, never have seen a reason for something like that .
I get one Network cable with 2 different Networks.
In both Networks are Clients located.
The idea was to start do splitt the Networks in to the Router with different subinterfaces.
I find the statement by Mirko slight ambiguous. When he says one network cable I am not sure whether that means a simple network with everything in one VLAN or whether he really means literally one cable from a switch to the router (which could conceivably be a trunk). My guess is that Dan is correct that it is multiple subnets within a single VLAN (for which secondary addressing is the solution). But I hope that Mirko will clarify for what what the environment really is.
Yes it is right, I have one cable from a Switch to the router with more than one Network.
I woult Splitt this Networks on the router in different VLAN.
We need a little more clarification. You tell us that it is a single cable from a switch with more than one network. We also need to know whether the connection on the switch is configured as an access port (there is only a single VLAN on the connection) or whether the connection of the switch is configured as a trunk (there is more than one VLAN on the connection).
From the previous posts I would assume that the switch connection is an access port with only a single VLAN but we need to know this for sure to be able to give you an accurate answer.
If the switch connection is an access port then the implementation of secondary addressing on the router will give you access to both networks. But it would not allow you to split them into separate VLANs on the router.