MPLS

Hai friends happy to catch you all back.... And now i'm back with an new stuff, MPLS.
Itz quite new to all those hear first but the cnceptual ideas on it were quite intresting.
MPLS - Multi Protocol Label Switching. This mechanism is quite obviously based on telecommunicattion network and further done on the cases as the transfer is between two network nodes.

Eventually the functioning will be of MPLS-labeled packets are switched after a label lookup/switch instead of a lookup into the IP table.When an unlabeled packet enters the ingress router and needs to be passed on to an MPLS tunnel, the router first determines the forwarding equivalence class (FEC) the packet should be in, and then inserts one or more labels in the packet's newly-created MPLS header. The packet is then passed on to the next hop router for this tunnel.


When a labeled packet is received by an MPLS router, the topmost label is examined. Based on the contents of the label a swap, push (impose) or pop (dispose) operation can be performed on the packet's label stack. Routers can have prebuilt lookup tables that tell them which kind of operation to do based on the topmost label of the incoming packet so they can process the packet very quickly.

A number of different technologies were previously deployed with essentially identical goals, such as frame relay and ATM. MPLS technologies have evolved with the strengths and weaknesses of ATM in mind. Many network engineers agree that ATM should be replaced with a protocol that requires less overhead, while providing connection-oriented services for variable-length frames. MPLS is currently replacing some of these technologies in the marketplace. It is highly possible that MPLS will completely replace these technologies in the future, thus aligning these technologies with current and future technology needs.