Catalyst 3560-CX Trunk Ports?

[chueymtz]

Question, I just purchased 2 Cisco Catalyst 3560-CX, reason for this, I have a fiber that runs to 2 different locations on the property, they will run from an sfp on a 9300 from the main site to sfp's on each of the 3560's. Do I need to make the sfp ports trunk ports? I don't have much practice with trunk ports.

[Flavio Miranda]

Hello

 Trunk is not a requirement. But,  it is so usuall to have more then one vlan in a switch that trunk became a natural connection between switches.

 But, lets say you have only one vlan on the 9300 and this very same vlan will be on the 3650. On this scenario, the ports dont need to be in trunk.

 But, lets say you have two vlans on the 9300 and you want them to be extended to 3650, on this case trunk is necessary.

Hope I could clarify it.

[Joseph W. Doherty]

Additionally, if your switches are L3 switches (which I believe a yours can be) connecting link can be a routed link.

[chueymtz]

The 9300 is a layer 3 i'm not sure about the 3560

[Joseph W. Doherty]

3560s should be L3 capable, but whether your IOS supports it may be dependent on IOS features version and/or enabled feature licenses.

[chueymtz]

I have 3 vlans that will need to carry over. How do i create a trunk port?

[Flavio Miranda]

Yes you do.  Put the interfaces netween switches in trunk and you will be fine.

 You dont need to add the vlan on the trunk, it is not a requirement.

 Just enter on the interface and change it to trunk

nterface x/x

switchport mode trunk

This is it. No further config is required. People tend to allow the vlan on the trunk but it is not required.

[MHM Cisco World]

If one vlan then config access port 

If multi vlan then you need to config trunk port.

[chueymtz]

Thank you I have about 3 vlans that will need to carry over. How do i create a trunk port?

[MHM Cisco World]

interface x/x

switchport mode trunk 
switchport trunk vlan allow 1,x,y,z  <<- x,y,z is the VLAN you have 
no shut

[chueymtz]

Ok, so assuming my vlans are 100,200, and 300. Is this what i would type

interface x/x

switchport mode trunk

switchport trunk vlan allow 100, 200, 300

no shutdown

Also, do i have to configure anything on the 3560 aside from that? Like do i have to go thru the process of creating vlans on the 3560's and then assign ports to the vlans?

[MHM Cisco World]

also allow VALN1 and VLAN100,200,300

[chueymtz]

is there a different command i have to put in the host 9300 switch? I put the same command as above for the config. And do i have to do anything on the 3560 to allow ports to the certain vlans?