10-04-2017, 09:08 PM
Network Border Patrol (NBP) is a congestion avoidance mechanism. whichallows routers on the borders (or edges) of a network to perform flowclassification and maintain per-flow state but does not allow routers at thecore of the network to do so.
Depending on which flowit is operating on, an edge router may be viewed as ingress or an egressrouter. An edge router operating on a flow passing into a network is called aningress router, whereas an edge router operating on a flow passing out of anetwork is called an egress router.
NBP prevents congestioncollapse through a combination of per-flow rate monitoring at egress routersand per-flow rate control at ingress routers. Rate monitoring allows an egressrouter to determine how rapidly each flow's packets are leaving the network,whereas rate control allows an ingress router to police the rate at which eachflow's packets enter the network.
Drawbacks of existing system
Packets are buffered in the routers presentin the network which causes Congestion collapse from undelivered packets ariseswhen bandwidth is continuously consumed by packets that are dropped beforereaching their ultimate destinations.
Retransmission of undelivered packets isrequired to ensure no loss of data.
Unfair bandwidth allocation arises in theInternet due to the presence of undelivered packets.
The solution strategiesare developed based on the thorough discussion with superiors and the trustedprofessionals of the concern. The Network Border Patrol is used to prevent thecongestion collapse in the network.
Advantages of proposedSystem:
Buffering of packets is carried out in theedge routers rather than in the core routers.
The packets are sent into the network basedon the capacity of the network and hence there is no possibility of anyundelivered packets present in the network.
Absence of undelivered packets avoidsoverload due to retransmission.
Fair allocation of bandwidth is ensured.
