The following fields are shown on the screen:
Unit ID—Identifies the currently selected Switch unit.
Port ID—Displays the current module type. It should read TIF.
Admin. State—This field allows you to *Enable* or *Disable* the TR-in-FE port.
Internal Priority—This field allows you to distribute the available bandwidth among the ports. *High* pri- ority ports are given priority access to internal resources, taking priority over *Normal* priority ports.
Full Duplex—The TR-in-FE Module works with either a Full Duplex or Half Duplex mode of operation. The Full Duplex field allows you to *Enable* or *Disable* Full Duplex mode. Disabling Full Duplex automatically puts the TR-in-FE Module in Half Duplex mode.
Max Packet Size—This field allows you two choices for setting the maximum packet size.
■1518—Use this value in traditional Fast Ethernet environments.
■4544—Use this value for larger packets when configured with a SuperStack II Switch 3000.
Jamming Mode—This field allows you to restrict the amount of packet loss allowable when configured with conventional switches. Jamming provides a vari- able parameter for determining the number of colli- sions. This feature is most helpful in networks using lots of repeaters. Choose from J6 through J13 where
J6 indicates the least amount of effort by the port to back off collisions. A value of J13 indicates more effort on the port. This feature is reserved for quali- fied and knowledgeable network managers.
VLAN Enable Mask—This field allows you to restrict or allow for membership in specific VLAN groups. Each bit in the two-byte field represents a VLAN denomination from 1 to 16 in hexadecimal. Refer to “Setting Up a VLAN” on page 5-5 for more informa- tion.
It is strongly recommended that you do not alter these settings.
Bridge Parameters
This section describes how to set bridge parameters for the TR-in-FE.
Spanning Tree
Spanning Tree is an algorithm designed to eliminate loops in networks. The algorithm detects and logically prohibits redundant paths by placing some bridge ports in the blocking state so that only one route exits between any two LANs and therefore any two sta- tions. After Spanning Tree eliminates redundant paths, the network reconfigures and stabilizes. Any time the network topology changes, the algorithm automatically relearns the new configuration and adjusts the bridge ports accordingly. This guarantees that all stations are connected.
■Priority—Priority determines the choice of port when the Switch 2000 TR has two ports connected to the same LAN, creating a loop.
