Cabletron Systems DLE33-MA, DLE22-MA, DLE32-MA, DLE23-MA manual SmartTrunk Configuration Screen

Chapter 5: Local Management

6.You must enable Spanning Tree before enabling SmartTrunk. Spanning Tree will ‘block’ any ports not used by SmartTrunk that are looped. This can include NETWORK and USER ports. The reason for the blocking of a NETWORK port is that the port at the other end of the link may be configured as a USER port.

Other Considerations

•If a network loop exists and SmartTrunk becomes disabled, and Spanning Tree is operational, then the Spanning Tree Algorithm will respond and block the necessary ports.

•If SmartTrunk becomes disabled, and a network loop exists, and Spanning Tree is not-operational (disabled), then an infinite packet loop would occur, taking down the network.

•If a port is disabled and as a result SmartTrunk is no longer active, then all traffic is redirected over the remaining port(s).

•If three or more interface m odules, such as the DLE2X-MA and DLE3X-MA, or standalone devices are connected together in a loop condition and all the ports that connect the loop are set to

“ NETWORK,” the results are unpredictable. In this case all ports are assigned as “ NETWORK” ports and none are configured as “ USER” ports. This is deemed an illegal configuration.

•If a network loop exists when a port is disabled, then SmartTrunk will reconfigure the remaining ports and continue to distribute traffic.

5.20.2 SmartTrunk Configuration Screen

The SmartTrunk Configuration screen may not be available if the operational mode of the module has been set to 802.1Q SWITCHING. Refer to your Release Notes to see if the SmartTrunking feature is supported.

Section 5.15.9 describes how to set the operational mode.

The SmartTrunk Configuration screen, Figure 5-25, allows the user to logically group interfaces together between devices to achieve greater bandwidth between the devices.

Access the SmartTrunk Configuration screen from the Module Specific Configuration Menu screen by using the arrow keys to highlight the

5-64 DLE22-MA,DLE32-MA,DLE23-MA and DLE33-MA User’s Guide