What is difference between IP Routing and MPLS VPN Routing ?
In IP routing as an IP packet travels from one router to the next, every router makes it’s own decision on where the packet should go. Each Router reads the IP packet header, and then runs a routing algorithm against the destination address to determine the next hop. Every router then chooses its own next hop for the packet based on the packets header and the routing algorithm.
In IP routingas an IP packet travels from one router to the next, every router makes its own decision on where the packet should go .Each Router reads the IP packet header, and then runs a routing algorithm against the destination address to determine the next hop. Every router then chooses its own next hop for the packet based on the packets header and the routing algorithm. Routers will assign each packet into a set of Forwarding Equivalence Classes (FECs) They will then map each FEC to a next hop. With MPLSevery packet only has its IP layer header examined once, when it enters the MPLS network. After the initial FEC assignment a 32 bit fixed length label(called MPLS Label Header or Shim Header) is inserted into the packet that contains the assigned FEC then is sent to the next hop router with the label attached. The label is of local significance only. When MPLS routers, which are called label switch routers(LSRs), are provisioned they will set up a table of label to FEC mappings. E
