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Now how do you switches learn about each other.
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As mentioned bridge protocol data units or BPT use are sent out of all ports on switches by default
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every two seconds when running spending three switches will learn about each other when they receive
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BPT use from other switches on their ports.
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As an example in this typology switch one will know that there's a loop because it's receiving a PPD
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from switch to on port 2 as well as Port three.
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So BPT use from a switch with the same bridge ID are received on multiple ports and thus switch one
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knows that there's a loop between itself and switch to in the same way switch to knows that there's
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a loop because it receives BPT use from switch one on both port 1 and port 3.
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In other words it's receiving BPT use from the same switch on multiple ports.
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Hence they must be a loop.
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Now PPD use contain lots of information and I'll demonstrate that in a moment.
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One of the pieces of information that a BPT contains is the bridge ID of the sending switch a spending
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tree bridge IDs an 8 byte value unique to the switch.
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It consists once again of a two by two party field and a six binary system ID with a system id being
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based on the burnt in MAC address of the switch.
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So in other words the bridge I.D. consists of the property 6:57 6:08 by default in decimal or eight
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thousand in hexadecimal and the MAC address of the switch.
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That means that the bridge is going to be unique in spending three.
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So BPT use contain information about spending tree switches.
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S. BPT use using a unique MAC address to a destination multicast address of because 0 1 ADC 2 0 0 0
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0 0 0.
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Or if using Poovey and spending 3 0 1 0 0 0 0 C C C C C C D.
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There are three kinds of people who use a configuration BPU which is used by spending tree to provide
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information to switches a topology change PPD you to tell switches of a change and an acknowledgement
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PPD which is used to confirm the receipt of a topology change notification are sent by default every
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two seconds once again.
3011
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