Specific VLAN isn't appearing on other side of trunk of 3850 switches.

[Mogwai]

I've got a set of 3850 switches & for some reason I can't get a specific vlan to appear on a down line switch.  The basic topolgy is as follows:

Switch1 (Trunk Te3/1/4) > Switch2 (Trunk Po1) > Switch3 (Trunk Gi1/1/1) > Client (Switch3 Gi1/0/15)

1. The VLAN already exists on Switch1 & I just added it to Te3/1/4 (switchport trunk allowed vlan add 4).

2. On Switch2, the trunk Po1 is set to allow all Vlans 2-2000. (I believe this is where the issue lies, as when I attempt to configure an access port on this switch with VLAN 4, it ends up creating VLAN 4 instead.)

Do I need to remove the VLAN range from the port-channel & list out the trunks individually on Switch2?  Not sure what the VLAN isn't traversing. 

[Flavio Miranda]

@Mogwai 

 Vlan must be create in all the switches. It is up to you allow only specific vlans or all vlans on the trunk but you need to have the vlan created in everything. Dont matter if you will assing the vlan to access port or not, you need to add the vlan.

[Mogwai]

@Flavio Miranda Thanks, I did that on the Switch2, but feel I'm still missing something as when a client is connected, the client isn't getting a network connection. 

On Switch2, I created the VLAN & added the same name from Switch1. I feel in the past I also had to add a gateway IP, but I believe that was on our router & not on the switch.  I can't seem to find the right show command on Switch1 to show the running config of VLAn4. When I try "show run int vlan4" it just provides a syntax error. 

[Flavio Miranda]

If you are crearing the vlan only in layer2 mode, the command you used has no use

 If you need to creste also layer3 for vlan, you need to use the command

Interface vlan  4

 IP address x.x.x.x  m.m.m.m

You need to have a layer3 somewhere , not necessarily on the switch.

[Mogwai]

Yes, the layer 3 aspect of the vlan is done by our core, so that isn't the issue. The issue just seems to be tied to the trunking of VLAN 4 from SW1 to SW2. 

[Flavio Miranda]

Right, if the layer3 is done on the core, all you need to do is configure the vlan 4 in all trunk from Core up to the last switch 3. And create the vlan in every switch, core included, with the command "vlan 4". Not necessary add name.

 After done that, you just need to add the interface where the PC is connected to vlan 4 with the command

switchport access vlan 4

And then add an IP address on the PC on the same ip address range configured in the core switch. Or left if as DHCP if DHCP is available on that vlan.

[Mogwai]

I guess that's why I'm confused.  I've attached a doc of the trunk configs. 

[Flavio Miranda]

I See you have Port-channel. Are both side with Port-channels?

Did you tried using the interface only as trunk?

Por-channel can cause issue and only make Sense If you are bounding interfaces

[Mogwai]

No, only the SW2 side is a port-channel. 

What do you mean by this? "Did you tried using the interface only as trunk?"

[Flavio Miranda]

Instead Port Channel, take one interface and configure as trunk.

For example,

Take interface g1/1 and connect to the second switch on g1/1

Put both interface as trunk.

So on so forth.

[MHM Cisco World]

Not sure what the VLAN isn't traversing. <<- what you meaning by this? if you talking about VTP ?

MHM

[MHM Cisco World]

I will send you PM 

MHM