US Robotics USR2410 Manual de usuario descargar pdf (Pagina 34)

5.2.2.2.

DSDVRouteTable

This element contained the routing table for the host router. It kept track of all of the information

known about the other routers in the network. The element kept track of such information as

whether the router was a gateway, if the router was online, the IP address of the router, the IP

address of the next hop router, and the number of hops needed to reach a router. The information

came from route advertisement packets. This element also periodically generated these route

advertisement packets.

5.2.2.3.

GridEncap

This element encapsulated a packet in a grid header. The grid header contained protocol specific

information, such as the source and next hop IP and MAC addresses of the packet. As well,

information regarding the purpose of the packet was included in the header. The two purposes

used in the mesh network were data packets and route advertisement packets.

5.2.2.4.

FromGridDev - Compound Element

All packets entering the router from the mesh wireless device were processed by this compound

element. All packets were first sent to a Classifier, which sent the packets to different outputs

based on their type. Packets with a grid header were sent to output zero. Packets containing

linkstat statistical information would have been sent to output one. Linkstat information was not

implemented in this mesh network. Packets that were not matched were sent on output two.

5.2.2.5.

ToGridDev - Compound Element

All packets leaving a router on the mesh wireless device went through this compound element. In

the mesh network, two types of packets were implemented, route advertisement packets and data

packets. They were classified and treated differently. A priority queue was created to manage

packets going to the wireless device. Route advertisement packets had their grid header source

address set. They were then given a higher priority in a priority queue.

Data packets had their destination address in their grid header set to the next hop required in order

to reach the actual destination. The next hop address was found from the DSDVRouteTable. The

data packets then had their grid header source address set to the current router’s address, and were

sent to the priority queue with a lower priority than the route advertisement packets. If the

destination was not in the DSDVRouteTable, the packet was dropped.

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US Robotics USR2410 Manual de usuario Pagina 34