2851 Router VLAN's on BVI?

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Jun 11th, 2007
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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
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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 Mon, 06/11/2007 - 13:59
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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
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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 Mon, 06/11/2007 - 14:13
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Ok, thanks for your help. That sounds like the solution to me.

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