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Categories : CCIE revision notes, cisco, IOS, L2TPv3
L2TPv3 has been designed to transport layer-2 frames of various types over a layer-3 backbone. Some aspects of the configuration are similar to that of EoMPLS – just without the need to deploy MPLS!
Packets are tunneled across the layer-3 network completely transparently, such that the two devices appear to be connected together. In the case of ethernet tunneling, there is no learning of MAC addresses – what goes in one side, comes out the other. That includes CDP, Spanning Tree and so on.
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Categories : CCIE revision notes, cisco
DPT and RPR (802.17) are both dual ring-topology networks, where the traffic in each ring rotates in different directions. DPT seems to have come first, it then became a standard of the IEEE in 2004, albeit with a few limitations. So Cisco support a kind of Cisco-proprietary RPR on some of their equipment (the ONS optical platforms) that they consider better. Read the rest of this entry »