"Core layer is designed for fast processing of packets and hence spanning tree is not extended to this layer"
Does STP affect switching? As I know Core swithces become the root bridge for STP operations that affect switching and consume switch resources like intervlan routing, routing, qos, filterings, access-lists take place in distribution layer and core layer switches utilizes their resources for these tailored frames by dist layer, pure switching.
"you would require L3 links to your distribution "
Yes you need L3 on the distribution in to the Core layer.
Core layer: This layer is considered the backbone of the network and includes the high-end switches This layer of the network does not route traffic at the LAN. In addition, no packet manipulation is done by devices in this layer. Rather, this layer is concerned with speed and ensures reliable delivery of packets.
Distribution layer: This layer includes LAN-based routers and layer 3 switches. This layer ensures that packets are properly routed between subnets and VLANs in your enterprise. This layer is also called the Workgroup layer.
layer 3 handles the routing of the data (sending it in the right direction to the right destination on outgoing transmissions and receiving incoming transmissions at the packet level). The L3 does routing and forwarding. Routers and Multilayer switches are part of this layer.
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