IBM 8260 Show Port slot.port Verbose, Static Switch Display for Active Per-Port Switching Ports

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