Sam or Bill Ok, fair enough. But if I create an uplink to a router and specifically define VLANs e.g. 25, 26, 27 etc. I assume (yes, I realize the danger) that VLAN 1 will be included. However, I am concerned on how to create the router interface the switch is linking to. In the config I posted I created sub-interfaces and ties the VLANs to them and defined the subnet (albeit only /30's) that is in the VLAN. I am wondering how the VLAN 1 traffic will react to the interface. I would like to be able to route from the VLAN 1 interface on the 3550 to the router. I am not sure about the "untagged" comment. When the traffic leaves the 3550 on it's way to the router is there a VLAN ID of 1? I somehow doubt it. I believe the VLAN 1 is used in the switch itself. Perhaps I am wrong, but it seems to me with the scenario I am working that there would be traffic that has an explicit VLAN ID defined and other traffic that has no VLAN ID set (untagged) This is just what I assume and am not sure however. Is it the case that if the traffic leaves the switch on a trunk port it populates the VLAN ID with 1?
Thank you for your response. I am still looking for answers/input as well. ----- Original Message ----- From: "Bill" To: Sent: Tuesday, March 04, 2003 8:19 PM Subject: Re: Native VLAN question [7:64431] > Hey Jim > Supposing you take a new switch out of the box and don't configure any > vlan's etc, all the ports will still be using a vlan. That vlan is called > vlan1 and all ports are on vlan1 by default. The devices on those ports > wouldn't need any router to route traffic since they all belong to the same > vlan and can talk directly. > > Hence, there is no such thing as untagged traffic. > And yes, to answer your question-all the packets you talked about will route > fine. > > I'll appreciate comments by experts on this list if I am talking correct. > Sam > > ""Jim Devane"" wrote in message > news:[EMAIL PROTECTED] > > I am kinda new to VLANs and need some advice. > > I have a router which I have broken an interface into FastEthernet > > subinterfaces. Each subinterface defines the VLAN. This has worked very > > well. But I am wondering if it is possible to make this port a trunk port > > and have other non-tagged traffic arrive on this port as well. > > Basically, I want to have tagged traffic and untagged traffic go to the > same > > Ethernet port, route the untagged traffic and tag the VLAN traffic. I am > not > > sure if I can have both types of frames on the same port > > I have posted my router's config below: > > I need to know how to allow other untagged traffic to be recieved on this > > port. > > > > thanks, > > jim > > interface FastEthernet0/1 > > description TRUNK_PORT > > no ip address > > no ip directed-broadcast > > no ip mroute-cache > > load-interval 30 > > duplex full > > ! > > interface FastEthernet0/1.25 > > description VLAN > > encapsulation dot1Q 25 > > ip address 192.168.64.101 255.255.255.252 > > no ip directed-broadcast > > ! > > interface FastEthernet0/1.26 > > description VLAN 26 > > encapsulation dot1Q 26 > > ip address 192.168.64.97 255.255.255.252 > > no ip directed-broadcast Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=64441&t=64431 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
