multiple VLANs in one port

Posted on 2008-10-20
Last Modified: 2008-10-23
is it possible to have two or more vlans in one port
for example, port 1 can have vlan1 and vlan2 users
im using catalyst 3548 switch, and 1701 router for routing
Question by:ammadeyy2020
LVL 57

Expert Comment

by:Pete Long
ID: 22756047
Hello ammadeyy2020,

Yes multiple VLANS can run on one port - if that port is "Untagged" basically you configure it as a trunk post (A trunk can carry any VLAN tagged traffic), once a port is "tagged" to one vlan it only caries traffic for that VLAN



Expert Comment

ID: 22756054
It is possible in Procurve switches (the ones I work with). it is called tagged VLANs. Try to look in that direction for your switch. Sorry for not being able to help you further
LVL 50

Expert Comment

by:Don Johnston
ID: 22756414
On the 3548 side, designate the port connected to the router as a trunk port.

On the 1701 side, you'll also create a trunk.

You can use ISL or 802.1q as your trunking protocol. I'm using ISL in the example below.


int f0/1

 switchport trunk encapsulation isl

 switchport mode trunk


int f0.1

 encapsulation isl 1

 ip address

int f0.2

 encapsulation isl 2

 ip address

int f0

 no shut


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Author Comment

ID: 22784255
for one port can i assign two vlans? clients and clients can use port 1 of the switch?
LVL 50

Expert Comment

by:Don Johnston
ID: 22785075
How do plan on connecting these two clients to a single port on the switch?

Author Comment

ID: 22785182
using a hub (unmanaged switch)
LVL 50

Accepted Solution

Don Johnston earned 500 total points
ID: 22785205
Then the answer is no. You can not have two VLAN's on one port.

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