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vlan dot1q configuration on cisco

Posted on 2006-10-19
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Last Modified: 2012-06-21
Hello,
i have the following configuration on a cisco router and it works. Our QoS policy was based on ip addresses.

interface FastEthernet0/0
 no ip address
 speed 100
 full-duplex
!        
interface FastEthernet0/0.1
 description DreamNet Vlan 1
 encapsulation dot1Q 1 native
 ip address X.X.X.X 255.255.255.0
!        
interface FastEthernet0/0.2
 description DreamNet Vlan 2
 encapsulation dot1Q 2
 ip address Y.Y.Y.Y 255.255.255.0
!        
interface FastEthernet0/0.3
 description DreamNet Vlan 3
 encapsulation dot1Q 3
 ip address Z.Z.Z.Z 255.255.255.0


Now we are changing our QoS policy on vlan id, so all users from all vlans will use the same ip addresses and we'll only control trafic based on vlan id. So i was wondering if the following configuration will work ?

interface FastEthernet0/0
 ip address X.X.X.X 255.255.255.0
 ip address Y.Y.Y.Y 255.255.255.0 secondary
 ip address Z.Z.Z.Z 255.255.255.0 secondary
 speed 100
 full-duplex
!        
interface FastEthernet0/0.1
 description DreamNet Vlan 1
 encapsulation dot1Q 1 native
 
!        
interface FastEthernet0/0.2
 description DreamNet Vlan 2
 encapsulation dot1Q 2
 
!        
interface FastEthernet0/0.3
 description DreamNet Vlan 3
 encapsulation dot1Q 3
 


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Question by:lemaitre75
1 Comment
 
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lrmoore earned 500 total points
ID: 17770811
Nope. Each sub-interface must have its own IP subnet address or there is no routing between subnets.
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