MPLS L3VPN with OSPF as PE-CE routing protocol

MPLS L3VPN with OSPF as PE-CE routing protocol

In this scenario we have a sample topology that is shown below. Routers R1, R2, R6 and R8 are owned by a customer and he wants us to establish reachability between these two sites through our SP network. Routers at site A are located inside a rack at Istanbul and routers R6 and R8 are located inside a server room at Ankara, Turkey. Our SP network extends across whole country so we have PoP at these two cities. Meantime we are using “OSPF 1” inside our SP network alongside BGP. The IPv4 BGP…Read more …
DMVPN redundancy

DMVPN redundancy

In this post I want to show you how to implement redundancy in DMVPN network. Cisco DMVPN design guide says that there are two kinds of redundancy in DMVPN networks: 1- Dual hub/Single DMVPN cloud 2- Dual hub/Dual DMVPN cloud Cisco does not recommend the first one in which we have 2 central hubs but both of them uses the IP from the same L3 network on their mGRE tunnels. The sample for this could be 192.168.1.1/24 for first hub, 192.168.1.2/24 for second hub and 192.168.1.3 to 192.168.1.254 for spokes. The disadvantages of…Read more …