From: ccie2be (ccie2be@nyc.rr.com)
Date: Sat Oct 11 2003 - 04:37:10 GMT-3
Hi Hunt,
Typically, you're right - the link between a workstation and a switch is
usually a plain old access link. However, there are Ethernet nic's that
support ISL trunking and I imagine that there are also nic's that support
802.1q but on this last point I don't know for sure.
As far as whether such a nic would also support DTP or PagP, I couldn't say,
but I wouldn't be surprised if some did.
Having a nic that supports trunking could also be very useful. Imagine a
server which should be accessible from multiple vlan's. Without a nic that
supports trunking, a router function is needed.
HTH, dt
----- Original Message -----
From: "Hunt Lee" <hunt_lee@bigpond.net.au>
To: "Kenneth Wygand" <KWygand@customonline.com>
Cc: <ccielab@groupstudy.com>
Sent: Saturday, October 11, 2003 1:54 AM
Subject: Re: switchport command
> Hi Ken,
>
> Thank you!!
>
> I can see that this setup would be useful for switchports between this
3550
> and a router that supports trunking capabilities.
>
> But for normal workstations, can they form trunks with the switch? I never
> have thought that it is possible.
>
> Would this setup be useful for IP Phones and appliance devices to
> communicate with all the other ports?
>
> I just try to think of scenarios where this may be useful =)
>
> Thanks,
> Hunt
>
>
> ----- Original Message -----
> From: "Kenneth Wygand" <KWygand@customonline.com>
> To: "Hunt Lee" <hunt_lee@bigpond.net.au>; <ccielab@groupstudy.com>
> Sent: Saturday, October 11, 2003 3:26 PM
> Subject: RE: switchport command
>
>
> > Lee,
> >
> > Yes, "switchport mode dynamic desirable" tells the port to send DTP
frames
> (Dynamic Trunking Protocol) to the other switch requesting that a trunk be
> dynamically setup. If the other side is listening to DTP packets (set to
> AUTO or DESIRABLE), the trunk will form. Also, if the other side is set
to
> ON, it will not use the DTP packets but will automatically be a trunk
> because it's "nailed on" at the remote end.
> >
> > Once the port becomes a trunk, the "switchport access vlan 120" command
> has no effect. If the switchport does NOT become a trunk, it will be an
> access port on vlan 120.
> >
> > The configuration you've provided essentially says "Try to become a
trunk
> port which will forward all VLANs by default... if you cannot become a
trunk
> port, you will be an access port - if you do in fact become an access
port,
> operate on VLAN 120". It's sort of a fallback, for lack of a better term.
> >
> > Am I clear in my explanation? If not, please let me know and I'll
> elaborate further.
> >
> > Thanks!
> > Ken
> >
> > -----Original Message-----
> > From: Hunt Lee [mailto:hunt_lee@bigpond.net.au]
> > Sent: Sat 10/11/2003 12:29 AM
> > To: ccielab@groupstudy.com
> > Cc:
> > Subject: switchport command
> >
> >
> >
> > Hi Group,
> >
> > Can someone please explain to me when one will use the following
command?
> >
> > int fa0/6
> > switchport access vlan 120
> > switchport mode dynamic desirable
> >
> > And on my practice exerices, they pretty much use these on all the
> switchports, including ones that are for connecting to routers and
> workstations.
> >
> > What I don't understand is, isn't the dynamic desirable command will get
> the switchport to try to neogotatie and become a trunk? If it is the case,
> why using it with switchport access vlan command ?
> >
> > And when would you use the switchport mode dynamic desirable command?
> >
> > Any help would be greatly appreciated.
> > Lee
> >
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