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Switch VLAN theory

rhinoceros asked
Last Modified: 2012-04-10
Switch 1 , Switch 2, Switch 3 and  Switch 4

It is a single local network by uplink connection.Now we want to setup different subnets by Switch VLAN as the following

            Switch 2 (NO VLAN)         Switch 3 (E0/1 - E0/24 VLAN 1)
                               |                                             |
                               |                                             |
                 Switch 1 (E0/10 - E0/24 VLAN 1) - E0/23 Trunk to Switch 3 E0/1
                                                                                     E0/24 UPlink to Switch 2 E0/1
                 Switch 1 (E0/6 - E0/9  VLAN 3)
                 Switch 1 (E0/1 - E0/5  VLAN 2)  - E0/1 Uplink to Switch 4 E0/1
                 Switch 4 (NO VLAN)  

1. The theory is correct?

 - Are Switch 1 and Switch 2 possible worked (Uplink and NO VLAN) ? I mean we MUST have same VLAN Name between 2 switch trunking ?

 - Switch 1 and Swtich 3 ?


   #[Switch 1]interface ethernet 0/23  
   #[Switch 1-Ethernet 0/23]port link-type trunk  
   #[Switch 1-Ethernet 0/23] port trunk permit vlan all  

   #[Switch 3]interface ethernet 0/1  
   #[Switch 3-Ethernet 0/1]port link-type trunk  
   #[Switch 3-Ethernet 0/1] port trunk permit vlan all  

 - IF PC is located on Switch 3, can find it from Switch 1 VLAN 3?


   #[Switch 1]interface ethernet 0/6
   #[Switch 1-interface ethernet 0/6]port link-type hybrid
   #[Switch 1-interface ethernet 0/6]port hybrid vlan 1 untagged

   #[Switch 1]interface ethernet 0/10
   #[Switch 1-interface ethernet 0/10]port link-type hybrid
   #[Switch 1-interface ethernet 0/10]port hybrid vlan 3 untagged

2. Switch 1, 2 and 3 are same model and Switch 4 is other brand name, is it also good for VLAN connection between Switch 1 and Switch 4 for trunk?

3. Is it also a working plan?

            Switch 2 (NO VLAN)    
                 Switch 1 (E0/1 - E0/10 NO VLAN)   - E0/1 Uplink to Switch 2 E0/1
                 Switch 1 (E0/11 - E0/24  VLAN 1)  - E0/11 Trunk to Switch 3 E0/1
                 Switch 3 (E0/1 - E0/24  VLAN 1)  

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Top Expert 2011

Yes, everything looks fine, you configure a trunk between switches which support it, and you connect your NO VLAN switches to access-ports of switch 1. So, if you connect your switch 2 to E0/24 switch 1, and E0/24 port is access-vlan 1, all ports on switch 2 will get vlan 1


I see, for furhter confirm...

1. When we setup VLAN to seperate different subnets, we may not need to create "ALL"

Example: Like as the question 3

( VLAN 1 + VLAN 2 ) is equal to (VLAN 1 + other zone NO VLAN), rite ?

It is worked?

            Switch 2 (NO VLAN)    
                 Switch 1 (E0/1 - E0/10 NO VLAN)   - E0/1 Uplink to Switch 2 E0/1
                 Switch 1 (E0/11 - E0/24  VLAN 1)  - E0/11 Trunk to Switch 3 E0/1
                 Switch 3 (E0/1 - E0/24  VLAN 1)  

2. We must create both physical VLAN zones (VLAN 1 + VLAN2), when it will have traffic exchange between both VLAN zones
(* for VLAN port link-type hybrid), rite ?

Thanks a lot !
Top Expert 2011
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