Spanning Tree Protocol
Loop protection Connect two switches to each other They'll send traffic back and forth forever There's no "counting" mechanism at the MAC layer This is an easy way to bring down a network And somewhat difficult to troubleshoot Relatively easy to resolve IEEE standard 802.1D to prevent loops in bridged (switched) networks (1990) Switch operation Forwarding decisions made by MAC address Keeps a big table of MAC address that have been seen All forwarding decisions are filtered through this list If the destination MAC is unknown, the frame is flooded Sent to every switch port in the local subnet/VLAN Hopefully the destination station will respond Flooding is hopefully a temporary process Directed traffic resumes when the MAC is seen STP port states Blocking - Not forwarding to prevent a loop Listening - Not forwarding and cleaning the MAC table Learning - Not forwarding and adding to the MAC table Forwarding - Data passes through and is fully operational Disabled - Admini...
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