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Two Types of BPDUs To this point, the chapter has referred to all BPDUs as a single type. Actually, there are two types of BPDUs: ? Configuration BPDUs ? Topology Change Notification (TCN) BPDUs Configuration BPDUs are originated by the Root Bridge and flow outward along the active paths that radiate away from the Root
Read MoreMetric = (107 / minimum bandwidth) + (sum of delays) * 256 Metric = bandwidth (slowest link) + delay (sum of delays) Bandwidth: [107 / minimum bandwidth in the path] Delay: sums of delays (in tens of microseconds). 1. Bandwidth [107 / minimum bandwidth in the path] ? ? 10000000/1544 == 6476 2. ?Delay:
Read MoreCisco IOS Version Guide IOS version numbers are formatted as follows:x.y(z)t The “x” designates a major revision number. The “y” designates a minor revision number. The “z” designates an individual release number The “t” designates a train identifier. Thus, the third release of IOS version 12.4 would be identified as 12.4(3). The major and minor
Read MoreCollision and broadcast domain in switch Consider the above diagram. Remember that: ? Routers separate broadcast and collision domains. ? Switches separate collision domains. ? Hubs belong to only one collision domain. ? Switches and hubs both only belong to one broadcast domain. In the above case, where are THREE broadcast domains and EIGHT Collision
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