Stp computer education

In a LAN, redundant links are added to improve the network availability of LAN. But these redundant links may cause the frame to loop in the network for an infinite time until some action is taken, e.g, some links are taken down. To cope with the problem of frame looping, Spanning Tree Protocol (STP) comes into play. Need for Spanning Tree: Consider the scenario below with 3 switches with one user attached to each switch. Arvind sends a broadcast frame to LAN and as nature of switch frame are send out from other ports (Gi0/1 & Gi0/2) except receiving port (Fa0/3). Now, this frame goes to SW2, SW2 also broadcast frame out of Gi0/2 and Fa0/2 ports. SW1 receives frame in its Gi0/1 ports. SW1 also broadcast frame then this frame goes to SW3 and frame broadcasting goes on. Remember that this frame broadcast also occurs in other direction from SW3 out of Gi0/1 port. Above discussed frame looping was from SW3’s Gi0/2 ports. You can imagine the frame flooding in that small LAN. This forever looping of frames around LAN is called Broadcast storm. This Looping of frames causes three problems as stated below: • MAC table instability – Due to looping of frame around LAN, MAC-Table of switch get changed frequently. Looping causes incorrect MAC-table entries resulting in incorrect frame delivery. • Broadcast Storm – Repeated forwarding of frames around links in LAN causes the inefficient use of links. • Multiple Frame Transmission – A very serious negative effect of looping is that mu...

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