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How to assign multiple VLANS to a port?

Last updated on January 27, 2021

        I have  a simple question about a network (I am new to this concept so please correct me if I am wrong).
I have a simple network as shown (GNS3): The network have 3VLANS (VLAN10 = DesignTeam, VLAN30 = EngTeam and VLAN20=Storage). What I would like is for Vlan30 to be accessed by VLAN10 & VLAN30. I have done some research and I do few things here i.e use router on a stick method but I want to do this via multi-layer switch. enter image description here This is what I have done: First created Vlans Second assigned port to my VLAN's: VLAN10 = f1/3 VLAN30 = f1/0 VLAN20 = f1/4 Third Assign ports to VLAN's: MainSwitch#conf t MainSwitch(config)#interface fastEthernet 1/4 MainSwitch(config-if)#switchport access vlan 10 MainSwitch(config-if)#switchport access vlan 30 and then if I run show vlan-switch I get different output each time (some port gets assigned to wrong VLAN's) Am I doing anything wrong, anything I shod read further? EDIT: if I do: show ip int br i get:
Vlan10                     192.168.10.1    YES manual up                    up      
Vlan20                     192.168.20.1    YES manual up                    up      
Vlan30                     192.168.30.1    YES manual up                    up 
I did show lan-switch and I get:
1    default                          active    Fa1/1, Fa1/2, Fa1/5, Fa1/6
                                            Fa1/7, Fa1/8, Fa1/9, Fa1/10

10   DesignTeam                       active    Fa1/3
20   Storage                          active    Fa1/4
30   EngTeam                          active    Fa1/0
If I access fa1/3 and do switch port access vlan10 then I get:
 1    default                          active    Fa1/1, Fa1/2, Fa1/5, Fa1/6
                                        Fa1/7, Fa1/8, Fa1/9, Fa1/10

10   DesignTeam                       active    Fa1/3 Fa1/4
20   Storage                          active    
30   EngTeam                          active    Fa1/0
As you can see the storage port moved to VLAN10 This is what I want (VLAN 10 & 30 have access to 20):
 1    default                          active    Fa1/1, Fa1/2, Fa1/5, Fa1/6
                                        Fa1/7, Fa1/8, Fa1/9, Fa1/10

10   DesignTeam                       active    Fa1/3 Fa1/4
20   Storage                          active    Fa1/4
30   EngTeam                          active    Fa1/0 Fa1/4
Am I still doing anything wrong?

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