Networking, Python, BigData and Linux

In this blog, I'll tell you how to configure the basic MPLS on the Core. Before we begin with the MPLS configuration, we should make sure that all nodes are reachable from each other. In the above topology, i've already configured ip configuration as per the IP addresses shown in the diagram, ibgp & eigrp in the core and ebgp in the external links. Hence, i can reach to anynode from anynode in the above diagram. Why the reachability is needed? thats because MPLS uses labels to switch the packets and those labels are distributed using the tcp 646 for ldp. However, while discovering the label distribution protocol neighbors, hello packets are exchanged using udp. Now, lets configure the MPLS ldp in the above core: on R1(PE): R1#config t R1(config)#mpls ip R1(config)#inetrface FastEthernet 0/0 R1(config-if)#mpls ip R1(config-if)#inetrface FastEthernet 2/0 R1(config-if)#mpls ip R1(config-if)#end R1#wr mem On R6(PE): R6#config t R6(config)#mpls ip R6(con

In this blog, i provide the detailed steps for configuring the bgp. I use the above topology to configure the bgp. In the above topology, i'm going to configure ebgp between R5 & R1 and between R4 & R3. In the core Autonomous system AS100, i'm going to configure the eigrp protocol. The most important thing you should keep in mind is, the neighbour id is the loopback ip address for all the bgp nodes. However, in the case of e-bgp the TTL is always set to 1, which causes the packets to get dropped while setting up the TCP connection. & hence i'll enforce the TTL value to 2 using ebgp-multihop 2 command. Rest of the things are pretty much straight forward, just try out the configurations in your setup, you will learn easily. Following are the steps you need to follow to configure the bgp on the above topology. Step1:  Lets configure the router R5: interface Loopback0 ip address 5.5.5.5 255.255.255.255 interface Loopback1 ip address 55.55.55.55 255.25