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If you have ALL Cisco routers, then EIGRP is a better protocol for a full mesh. In order to control the source to destination traffic you must design the network with the appropriate IP address scheme => summarization, subnets, etc. You need to provi...
Make sure your ethernet connection is set to "autonegotiate" on both sides or manually set to whatever you decide: 100 Mbps/Full Duplex, 10 Mbps/Half Duplex, etc.