Unanswered Question
Aug 9th, 2007

I need to implement Hub and Spoke MPLS L3 VPN. Scenario is we are

implementing 30 VPNs on one Router i.e. 10720 in single VRF and with same

RD. How can I implement Hub and Spoke in this case?

I have this problem too.
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htarra Tue, 08/14/2007 - 13:43

When you want to have an MPLS/vpn hub and spoke topology, the HUB-PE router will need to have 2 vrf's. One which we can call 'from-spokes' and another 'to-spokes'. In the first one, we will have the routes that are being received from the spokes. In the other one, we will have the routes that will be advertised to the spokes; in this one we will certainly NOT have the routes to the other spokes. The HUB-PE needs to have 2 interfaces or sub-interfaces connected towards the CE site. One interface will be in "from-spokes" VRF and the other one will be in "to-spokes VRF. That way the traffic coming from one spoke will always go to the CE via one vrf interface, then come back from the CE via the other vrf interface and sent out towards the other spoke. This is the general overview of a Hub-spoke mpls-vpn topology


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