Multiple VLANS on the same Interface range

[dmclarnon]

I want to know how to

assign multiple VLANS to the same switchport, the scenario is that there is an end client on

172.17.10.44 witha default gateway of 172.17.10.20 on a router with the end client connected to fastethernet 0/1 of a 3550 multi-layer switch, the mamanagment VLAN of the switch is VLAN 2 and the ip address is 172.17.10.1, but i cant get the client to ping the rouiter and i cant ge the router to ping the switch, surely in the real world and I think ive seen this type of topology before of a multilayer switch connected to a router with the multi-layer switch passing traffic for multiple VLANS on some or all of its interfaces, please help me out

[George Stefanick]

It could be a few things. First i would start by putting 2 deivces in the same vlan and make sure you can ping them. Can you post your swicth config ? Perhaps you need to assign the ip default gw ..

[cadet alain]

Hi,

On your  router: sh ip int br and sh run | s int as well as sh cdp nei

On your switch: sh int status, sh ip int br | in Vlan and sh run | s int

Regards.

Alain.

[dmclarnon]

Thanks to you guys that replied, I know where i wass going wrong now,  I should have used

conf t

interface gigiabitethernet 0/1

switchport mode trunk

switchport trunk allowed vlan 1,2,3

i originally configued the interface with seperate VLANS and that was the problem

the underlined part of the config is where i went wrong, cheers people.

Cheers