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VLAN Question
telecomops101
Member Posts: 128
in CCNA & CCENT
When there are multiple VLANS on a LAN along with non VLAN traffic (native VLAN 1) do I need two FA ports on the router to ensure Inter-VLAN Routing and one to pass the VLAN 1 traffic? Or, is there a way to add the non VLAN traffic on the sub-interface of the trunked link between the router and switch.
"Every job is a self-portrait of the person who did it. Autograph your work with excellence."
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networker050184
Mod Posts: 11,962 Mod
You can use the encapsulation dot1q 1 native command.An expert is a man who has made all the mistakes which can be made. -
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billscott92787
Member Posts: 933
With inter-VLAN routing you can use the traditional method or the router-on-a-stick method. The traditional method is where there is one interface PER VLAN. Router-on-a-stick, you can use to be able to communicate for each individual VLAN. Even VLAN 1 is a VLAN so you are dealing with VLAN traffic. You would configure create logical subinterfaces of that one interfaces, one sub interface for each VLAN. This will allow traffic management for multiple VLANs. For example you could have the following:
int fa0/0.1
encapsulation dot1q 1
ip address 192.168.1.1 255.255.255.0
int fa0/0.2
encapsulation dot1q 2
ip address 192.168.2.1 255.255.255.0
int fa0/0.3
encapsulation dot1q 3
ip address 192.168.3.1 255.255.255.0
and so on. -
Optionswastedtime
Member Posts: 586 ■■■■□□□□□□
I am assuming you are talking about 802.1q. The native traffic is untagged and anything else that is untagged is considered in the native vlan. Just because it isn't tagged doesn't mean that it isn't part of a vlan. So you would just need one port.
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Optionstelecomops101
Member Posts: 128
I understand how to enter the commands for the non-native vlans, so would I just need to enter the below command to pass my native vlan 1 traffic and only have to use one FA port?
Interface fa0/0.1
encapsulation dot1q native 1
ip address 192.168.1. 255.255.255.0"Every job is a self-portrait of the person who did it. Autograph your work with excellence." -
Optionsnetworker050184
Mod Posts: 11,962 Mod
telecomops101 wrote: »I understand how to enter the commands for the non-native vlans, so would I just need to enter the below command to pass my native vlan 1 traffic and only have to use one FA port?
Interface fa0/0.1
encapsulation dot1q native 1
ip address 192.168.1. 255.255.255.0
Yep thats it. And the same for any other VLAN you make the native.
Its encaps dot1q 1 native not the other way around though and of course a complete ip address.An expert is a man who has made all the mistakes which can be made.