Features 21FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\Dell Astute\UserGuide\Dell_Astute_Features.fmD E L L C O N F I D E N T I A L – P R E L I M I N A R Y 8 / 9 / 1 6 - F O R P R O O F O N L YPrivate VLANThe Private VLAN feature provides Layer 2 isolation between ports that sharethe same Broadcast domain, or in other words, it creates a point-to-multipoint Broadcast domain. The ports can be located anywhere in theLayer 2 network.For more information, see Private VLAN .Multicast TV VLANThe Multicast TV VLAN feature provides the ability to supply multicasttransmissions to Layer 2-isolated subscribers, without replicating themulticast transmissions for each subscriber VLAN. The subscribers are theonly receivers of the multicast transmissions.For more information, see Multicast TV VLAN.Spanning Tree Protocol FeaturesSpanning Tree Protocol (STP)802.1d Spanning Tree is a standard Layer 2 switch requirement that enablesbridges to automatically prevent and resolve Layer 2 forwarding loops.Switches exchange configuration messages using specifically-formattedframes, and selectively enable and disable forwarding on ports.For more information, see Rapid Spanning Tree .Fast LinkSTP can take 30–60 seconds to converge. During this time, STP detectspossible loops, enabling time for status changes to propagate and for relevantdevices to respond. This period of 30-60 seconds is considered too long aresponse time for many applications. The Fast Link option bypasses thisdelay, and can be used in network topologies where forwarding loops do notoccur, for example, on edge ports connecting to endpoint devices.For more information on enabling Fast Link for ports and LAGs, see RapidSpanning Tree.
