Vlan with multiple switches

[vogelspinne24]

Hello!

ive got 3 cisco sg switches (sg300 20 port managed)

i want to make one portbased-vlan with those

i simulated the whole thing  in "cisco packet tracer" and it worked,

i set the the uplinks of each switch to trunk with vlan "1-1005" ( i once read on the cisco forums  that trunks admit all tagged frames from "1 to 1005" except defined otherwise ?, atleast for  enterprise switches, is it the same for small business switches ?)

i set "port 19" on switch 1 to access-port with  vlan-id 2 also  did the same thing with "switch 3"

the devices could connect with eachother and it worked perfectly fine (also i could add a second pc to a unconfigured port and ping it from another pc on a also unconfigured port on another  switch ("switch 1" to "switch 3")

now my questions are: will it work the same with sg300/200 switches?

is the following procedure correct?

1)  configure "port 19" as  access-port with "vlan id2" on "switch 1" and "switch 3"

2) do not configure anything else, because ports are trunked by default and should amit vlan "1-1005"

3) finish

question 2:   also, does cisco have something like a switchconfig converter ??

question 3:   is there a possibility to set "port 19" on "switch 3"  to trunk with vlan membership of "id 2", so i dont have to give the pc a second NIC just for the vlan

[jaredhoskins · Accepted solution]

Hey vogelspinne24,

Yes, trunking will work with the Cisco SG300/200 series switches. 

1) If you configure port 19 on switch 1 and 3, set trunk ports between switch 1 to 2 then switch 2 to 3 that allow vlan 2, yes traffic will flow.

2) You are correct in the fact that when you turn the switchport into trunk mode using 'switchport mode trunk' this will allow all vlans to pass.

3) It looks like you have two seperate IP schemes, are you using vlan 1 as your native for the 11.11.11.0/24 network and vlan 2 for the 10.10.10.0/24 network?

Question2: I'm not quite sure if Cisco has one or not. I would have to do a little bit more digging for that.

Question 3: If I understand right, you are wanting switchport 19 to talk on both vlan 1 and vlan 2 network? This is where you would need to put a router in the mix.

Hope this helps! 

[vogelspinne24]

so the config would look like this

......

interface gigabitethernet19
 switchport mode access
 switchport access vlan 2
!
interface gigabitethernet  "numberofuplink"
 switchport mode trunk   (is there anything else to write, so it lets all traffic flow?)
 ..........

[jaredhoskins]

The config is correct for the end device, just don't forget 'no shutdown' =)

As for the trunk ports you will need to include dot1q encapsulation so the switch knows what vlan the packet belongs to. So, the config will look like this:

interface gi0/x

 switchport trunk encapsulation dot1q

 switchport mode trunk

[vogelspinne24]

wait, isnt it aldready dot1q´d, because i tried to add dot1q once and it rejected uploading the config

[jaredhoskins]

I think it depends on what version and flavor of IOS you are running. I threw your config up in packet tracer and before it allowed me to trunk the interfaces between the two switches it screamed that I needed add the dot1q encapsulation before I could turn it into a trunk port.