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AppleTalk generally uses RTMP to transmit routing information to neighboring routers. It broadcasts its routing information every 10 seconds to all directly connected networks.
To save network bandwidth, RTMP provides distance vector, split-horizon routing . In split-horizon routing, a router does not advertise routes it learns from an interface through the same interface, because neighboring routers reachable through that interface know the information already.
RTMP has a maximum hop count of 15. (Hop count is the number of routers, or hops, that must be traversed to reach the destination network.) If nodes on an AppleTalk internetwork are separated by more than 15 routers, they cannot communicate.
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