Use of Hub on trunk port...please help

[samirshaikh52]

Hello Experts,

I have small problem. I explaing the scenarion We have switchport of cisco 3560 in a room, a 6 port 3com hub is hooked up to this port and moreover a 1131AG WAp is connected to this 3com hub . A AP is confured with 2 SSID' in a vlan environment. The switchport is configured a trunk. Now the problem is that the client directly connected to 3com hub cannot access the nework but AP clients can access succesfully.

Please can someone help me to resolve this issue.

Samir

[Jon Marshall]

Samir

The client directly connected to the hub, what vlan is it meant to be in ? Whichever vlan this is you will need to make sure that that vlan is the native vlan configured on the trunk link on the switch. This is because the client will be sending untagged packets so the switch will associate these with the native vlan.

So if your client is in vlan 10 then you need to make the native vlan on the trunk vlan 10. Note that if you have configured the AP to be a trunk link as well then you will need to make vlan 10 the native vlan on that as well.

Jon

[samirshaikh52]

Hi,

Thanks for your reply. My clients are in vlan 3 and native vlan on switch is vlan 25. Why ?? Because the AP mangement ip is in vlan 25.

I have a SSID on AP configured for vlan 3

Here is my port configuration

interface gi0/3

switchport trunk encapsulation dot1q

switchport trunk native vlan 25

switchport trunk allowed  vlan 3,25

switchport mode trunk.

Regard's

Samir

[Jon Marshall · Accepted solution]

Well, i've explained why that won't work. The clients on the hib must be in the native vlan on that trunk link so you need to change the native vlan to be vlan 3 on both ends of the trunk ie. the switch and AP or move the clients into vlan 25.

Jon

[samirshaikh52]

Hi,

Thanks for your help and explanation.

I've changed the managment ip on AP and move it to vlan 3 subnet. Now everything works fine.

Regard's

Samir