TS-7840 Ethernet

The TS-7840 supports 7 total Ethernets. The CPU offers a total of 3 Ethernet ports which each have 1Gb/s of bandwidth available. The eth0/eth1 ports directly provide a connection to a dedicated CPU Ethernet. The eth2 port is connected to a Marvell 88E6352 gigabit switch.

The gigabit switch provides 5 external Ethernet ports. On startup all ports are disabled and Linux configures all 5 ports (lan0-lan4) to forward packets only to and from the CPU Ethernet port. These interfaces will act as individual Ethernet ports, with the exception that they share 1Gb/s to the CPU. If ports are bridged with brctl, the switch will connect their internal VLANs and forward packets between them without requiring the CPU's intervention. The WAN ports can also be forwarded to LAN ports the same with with brctl, but this will use CPU time instead to coordinate bridging the ports.