User's Manual

System Architecture and Protocol Guide – 9-05 6 © 2005 SkyPilot Networks, Inc.
Routing Example
Example of mesh routing based on lowest link cost.
• SkyExtender A – This node, the first one deployed, receives a cost of 23 directly from the SkyGateway. The node selects to
route over this 36/24 Mbps link.
• SkyExtender B – This node receives a cost of 30 directly from the SkyGateway, and it selects to route over this 24/24Mbps
link.
• SkyExtender C – This node receives two cost messages, one from SkyExtender A advertising a cost of (23*1.1) + 21 = 47 and
one from SkyExtender B advertising a cost of (30*1.1) +30 = 63. This node selects to route via SkyExtender A and stores the
route via SkyExtender B as a backup route. Note that when SkyExtender C is added to the network, it forwards a cost related
to the SkyGateway/SkyExtender B route to SkyExtender A, as well as a cost related to the SkyGateway/SkyExtender A route
to SkyExtender B, thereby providing an alternate route to these nodes.
• SkyExtender D – This node receives a cost of 63 from SkyExtender B and a cost of 70 from SkyExtender C. Therefore, it
selects to route using two hops via SkyExtender B.
• SkyExtender E – This node receives a cost of 59 first from SkyExtender A then a cost of 70 from SkyExtender C. Therefore, it
selects to route using two hops via SkyExtender A.
• SkyExtender F – This node receives a cost of 110 from SkyExtender A and a cost of 86 from SkyExtender E. In this case,
SkyExtender F selects to route using a three-hop route via SkyExtender E and SkyExtender A.