Hi Amit, Think about what happens when a switch receives a broadcast, unknown-unicast (that is a frame destined for a unicast receiver that the switch doesn't know how to reach yet) or a multicast frame sometimes referred to as BUM frames.
The switch will send it out all ports except the one it received the frame from. This isn't a problem except if you start to introduce physical loops into your network to provide resiliency against a link failure, you can get a BUM frame spinning around the network. Unlike IP there is no TTL that decreases and eventually hits zero and gets dropped, that guy is there until something breaks the path. Spanning Tree protocol is a mechanism to detect and deterministically break the loop by blocking a link. Cheers, Adam On Thu, Apr 14, 2011 at 4:39 PM, Amit Jp <[email protected]> wrote: > I,need to know what is switching loop how a frame is moved across I have > read bcmsn but some parts aren't clearly > explained > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
