2851 Router VLAN's on BVI?

Unanswered Question
Jun 11th, 2007

Hi all,


Does anyone know how to implement VLAN's on a 2851 using the two Gig Ethernet ports whilst maintaining redundancy between both ports (ie BVI)?


I realise you can create subinterfaces on an individual port basis, however that won't provide redundancy across both built-in ports.

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Paolo Bevilacqua Mon, 06/11/2007 - 02:21

On the interfaces, put no ip address and a bridge-group. On the BVI, IP address. Globally, bridge irb and route ip. You can do that also at subinterface level. One interface will go "blocked" by STP.


Hope this helps, please rate post if it does!

gregsmales Mon, 06/11/2007 - 13:59

Yes, however can you create subinterfaces on BVI's? My understanding was that you couldn't do this

Paolo Bevilacqua Mon, 06/11/2007 - 14:07

No you will create the subinterfaces on the physical interfaces and defined the desired VLAN with "encapsulation dot1q ". After that you configure said subinterface in a bridge-group and said bridge-group will communicate with a BVI interface numbered like the bridge-group, that you need to configure as well. So you will have that many BVI interfaces as many subinterfaces, and as many bridge-groups.


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