Some switch one we're going to shut the interface down to force traffic to go via the hub interface
gigabit zero to shut it down.
Show interface gigabit zero or three switch port this port gigabit series three is acting as a trunk
using editor the one key all villains are allowed.
So let's do a capture on the hub.
We were receiving previous information and noticed the difference here has an or that one Q header.
So we have eaten it.
But notice the type is not IP version for the type is a result of one.
Q So the type is zero x 8 100 rather than zero x zero a hundred for IP.
So for one keyframe we can see here that the villain ID for this previous message is VLAN 1 pavilion
spending three cents what are called BPT use on every villain.
So here we can see some spending information and as we scroll down we can see that as an example CGP
and VCP messages on this case DTP is sent as an untagged frame so we can see some DTP information are
arriving here.
And that will continue on.
So let's do a ping from rodded to acting as PC two to four and see if we can see why the frames are
not permitted
so ICMP showing nothing.
So we can see a broadcast here.
This is an OP message saying who has 10 1 2 4.
So in this op message I'll just stop that capture for a moment.
Here's the OP you can see it's an Ethan a two frame with a cost.
So the destination is a broadcast source MAC address is the MAC address of rockety.
We can see that by looking at the interface.
It's a show interface.
If there zero notice there's the MAC address of the router.
And there it is shown in the shock capture.
But notice the type is once again added to the one key and the villain is set to villain to.
So in other words the router is sending the frame untagged to the switch.
But when it goes across this link it's going as a tagged frame.
The switch is setting the violent tag to two because it arrived on this port which is in V land to just
reset that capture what I want to show you is on this port is going to show is untagged standeth in
it.
But on this one it's going to show is tagged because the switch is tagging the frame
so do the ping again.
Now this is the frame to the switch from the router and we'll do a search for up.
You can see there's the traffic from the router to a broadcast address.
It's untagged.
This is the type for up there is no ADA to the one queue headache here at all.
But when we look for up on the link between the switches notice you can see the ADA two to one queue
tag set to.
So the traffic is arriving here is untagged and the switches tagging it to send the frame to switch
to.
The problem here is when the traffic hits switch to switch to is not configured with trunking.
This is just an access port in villaine one so that traffic will be sent on to this port but not out
of this port which is invalid to switch to let's see if we can see that show interface trunk.
At the moment no interfaces are trunking show interface.
Gigabit zeros three.
And let's put switch port at the end.
So show interfaces gigabit is three switch port the interface Gingrich rich 0 3 is enabled.
It's set for negotiation of trunking.
So it's in a LAN one.
This port belongs to veel and one it's an access port.
No trunking is enabled.
So traffic from router to is simply going to be sent out of this port.
So let's do a capture there to prove that
and then we'll do a capture on this port to check if any traffic arrives on this port.
So there's the washup capture do the ping again on Broadway to do a full time for AAP.
And notice there's the broadcast traffic from 10 1 to 2 which is routed to
asking for the mac address of 10 1 to 4 Sarada 2 is asking for the MAC address of rota for.
But it never receives that.
So what you'll also notice here is there is no added to the queue tag.
So the frame was St. untagged here.
It was sent tagged across here arrived yet.
But this port was configured as an access port and we learned one.
So the traffic was simply copied out of this port in the land one with no tag the traffic never arrived
on this port.
So let's prove that to capture here.
Well do the ping again and try and filter for up and what you'll notice is there's no up traffic because
the traffic is arriving on an access port Port one.
It's only going to be sent out of this port which is port one.
It's not going to be sent out of this port at all.
So let's stop all captures and then what we'll do now is configured this port to be a trunk port and
the port to be a trunk port.
But we'll leave the port shut down for the moment so that we can see the traffic being captured.