Bay Networks 5390 Administering page 226

Communications server

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parameters a_router, zone, and node_id are hints for the Model 5390 server to use at startup

(AppleTalk-speciﬁc Model 5390 Parameters on page A10-3 describes these parameters).

The Model 5390 server behaves like an AppleTalk phase II end node. At startup, it listens for an

AppleTalk router in the startup network range and begins the process of ﬁnding its address. The

Model 5390 server selects as its A_Router the ﬁrst router it detects broadcasting an RTMP Route

Data Request. It acquires an address within the A_Router's net-range and then uses a ZIP GetNetInfo

and ZIP GetZoneList to ﬁnd the network's zones; otherwise The Model 5390 server obtains an

available address within the startup range.

The Model 5390 server also installs a net-range route and an AppleTalk default route from the

A_Router. If another router broadcasts an RTMP message, and its Ethernet address matches the

address deﬁned in the Model 5390 parameter a_router, the Model 5390 server discards the current

router information and tracks to this new router. If the Model 5390 server does not hear from the

current A_Router for 50 seconds, it selects a new A_Router. This 50 second hold-down prevents

the Model 5390 server from bouncing between routers.

When ARA clients connect to the Model 5390 port, the node_id parameter acts as a hint to acquire

an address for the client. The Model 5390 server then installs a proxy aarp entry and the client's

zone multicast address.