Cabletron Systems TRMMIM manual Ins

Using the TRMMIM Hub View

FNB Bypass States

Figure 2-14shows that all three modules are inserted into FNB 1, as opposed to being bypassed from the FNB by a multiplexer. There are two possible status conditions for a Token Ring module:

INS

The Bypass multiplexer is disabled, and all station ports and ring ports can be connected to the FNB (depending on the status of the surrounding boards and FNB connections).

BYP

The module is Bypassed, and the MIM ports form a self-contained ring. Stations connected to the ports can communicate with each other, but they can’t pass frames to the main ring. Ring ports are unaffected by the Bypass state (unless you are modeling an older TRMIM-10R or TRMIM-20R; with these two modules, all ports on the board enter bypass state and are isolated from the main ring). They can communicate with other Token Ring modules if the FNB connection status allows, but station ports on the MIM are no longer connected to the ring ports.

Ring ports can be separately bypassed using the RP Bypass option in the Module FNB Configuration window. See Using the Module FNB Configuration Window for details.

Manipulating the FNB in the Hub View

To change a module’s FNB left and right connections from within the Hub View:

1.Click mouse button 1 on the appropriate FNB connection symbol to toggle between disabled and enabled.

To change a module’s FNB Bypass state from within the Hub View:

1.Click mouse button 1 on the Bypass State box at the top of the module to toggle between BYP and INS.

Using the Module FNB Configuration Window

The Module FNB Configuration window allows you to manipulate a module’s FNB left and right connections and FNB Bypass state. You can also bypass a module’s ring ports using this window. The window lists each FNB interface available for a module (for the TRMMIM, only FNB 1 is available), allowing you to select the FNB and quickly apply the desired settings. To open the Module FNB Configuration window:

1.Click mouse button 3 on the Module Name, FNB State, or Port Display Form box to display the Module menu.

2.Drag down to FNB Status, and release. The Module FNB Configuration window, Figure 2-15, will appear.

Managing the Hub at the Module Level 2-29