2851 Router VLAN's on BVI?

gregsmales · ‎06-11-2007

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.

paolo bevilacqua · ‎06-11-2007

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.

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gregsmales · ‎06-11-2007

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

paolo bevilacqua · ‎06-11-2007

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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gregsmales · ‎06-11-2007

Ok, thanks for your help. That sounds like the solution to me.