Jul
05
UDLD (Unidirectional Link Detection) is Cisco proprietary extension for detecting a mis-configured link. The idea behind it is pretty strighforward - allow two switches to verify if they can both send and receive data on a point-to-point connection. Consider a network with two switches, A and B connected by two links: "A=B". Naturally, if "A" is the root of spanning tree, one of the ports on "B" will be blocking, constantly receiving BPDUs from "A". If this link would turn uni-directional and... Read More

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