
AppleTalk Overview
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AppleTalk routers that connect to an AURP tunnel are exterior routers. Exterior
routers function as AppleTalk routers within the AppleTalk internet, and as end
nodes within the IP internet. Exterior routers assign unique domain identifiers
(DI) to AppleTalk internets to distinguish between multiple AppleTalk internets
connected to the same tunnel.
Figure 1-9. AURP Tunneling across an IP Internet
A Bay Networks AppleTalk router supports one fully connected or partially
connected tunnel with multiple connections. In a fully connected tunnel, all
exterior routers have connections to all other exterior routers in the tunnel and, as
a result, have full access to all resources these routers provide (Figure 1-10).
IP internet
Tunnel
Exterior
router
AppleTalk
internet
AppleTalk
internet
APT0009A
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