Genie's Tech Blog

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OSPF Local-RIB

Hello Friends, Today, I will be sharing an interesting issue which we noticed during one of our migration projects. The feature that i am going to discuss today is the OSPF Local-RIB feature. In order to understand the feature, lets try to create the problematic condition. Consider the below topology: In the above topology, Rx router has the Loopback address of x.x.x.x/32 (ex. R1 has a loopback of 1.1.1.1/32). All the nodes are running basic OSPF configuration which is advertising the physical interface and the loopback interface. Thus we have a end to end reachability. Lets have a look at... [More]

Inter-AS MPLS VPN - Back to Back VRF

Hello All, Today, We are going to discuss about one of the very common topics on Inter-AS MPLS VPN's i.e. Inter-AS MPLS VPNs with Back to Back VRF. We are already aware of how Intra-AS MPLS VPN's work. This has been discussed deeply in one of our previous posts (Link Below). http://blog.codergenie.com/blog/page/MPLS-VPN-Basic.aspx In Inter-AS VPN, Customers connect their sites across AS boundaries. The very first and basic type of Inter-AS deployment is Back to Back VRF. In this approach, the ASBR of both AS's connect each other through multiple sub-interfaces where in each sub-interface se... [More]

OSPF Multi-Area Adjacency

Hey Guys, I am back again with an interesting topic. OSPF Multi-Area Adjacency, But before we get onto this topic, lets get to the background of OSPF and why we need this feature. OSPF always prefers intra-area routes over the inter-area routes. This may cause suboptimal routing depending on which area the link is configured. In real life scenarios, Virtual Links are also not the feasible solution to solve the suboptimal routing issue and neither adding parallel additional physical or logical links for each area as this would not scale from the aspect of cost, capacity and operational impact... [More]