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5. Participation in neighbor notification
By participating in the neighbor notification, the station learns the address of
its Nearest Active Upstream Neighbor (NAUN). It also identifies itself to
nearest active downstream neighbor.
6. Request initialization
The station issues a Request Initialization MAC frame which will be sent to
the Ring Parameter Server (RPS) functional address. This frame is used to
request operational parameters such as the ″ring segment number″ and
″Soft Error Timer Value″ from the Ring Parameter Server if one present. The
Ring Parameter Server will provide this information to the station by
transmitting an Initialize Ring Station MAC frame.
The Request Initialization MAC frame is also used to register the station with
the LAN Network Manager if one is present on the network.
In a per-port switching module, if you switch a port from one ring to another,
while the adapter is open, the station will not perform some of these functions
such as testing for duplicate MAC address. It is, therefore, conceivable that if
the administrator is not careful, an open adapter can be moved to another ring
which contains an adapter with the same address. This will result in having two
stations on the same ring which can produce unpredictable results.
To prevent a station from being able to be switched from one network to
another, the static switch can be set to
enabled
. In that case, you can only
switch the port if the phantom voltage on that port is dropped. In other words,
when the static switch is enabled, you can not switch an open adapter from one
ring to another.
You can display the status of the static switch for each port by using the
following DMM command:
SHOW PORT {slot.port} VERBOSE
An example of the output from this command is shown in Figure 88.
8260> show port 6.1 verbose
Port Display for Module T18PSA :
Port Mode Status Network General Information
----- -------- ------------------- ---------------- --------------------
06.01 ENABLED OKAY TOKEN_RING_10
Alert Filter: DISABLED
Port Connector: RJ45S
Dip Network Setting: TOKEN_RING_1
Static Switch: DISABLED
8260>
Figure 88. Static Switch Display for Active Per-Port Switching Ports
You can modify the status of the static switch for each port using the following
DMM command:
146 8260 Multiprotocol Intelligent Switching Hub