3Com 5101M-MGT installation and operation guide Assigning Module Mastership Priority

If you isolate a module, the isolated module cannot send or receive any traffic from other modules in the concentrator. Initially, all ONline modules are factory-set to network 1, but will come up isolated if a management module is installed in the concentrator.

Use the following command to assign the Ethernet module in slot 7 to network ethernet_1:

ONline> set module 7 network ethernet_1 [ENTER]

Assigning Module Mastership Priority

All ONline management modules are shipped from the factory with a mastership priority level of 10. Ten is the highest priority. When multiple management modules reside in the same concentrator, the SET MODULE MASTERSHIP_PRIORITY command enables you to establish one of the modules as master management module and all other modules as slaves.

An EMM master manages the network to which it is assigned, controls all configuration, and supplies all fault-detection capabilities for the entire concentrator. A slave management module can only listen to its assigned network's activity. Both master and slaves can collect statistics on only one network at a time.

The first EMM you place in a concentrator should maintain the default mastership priority level of 10. Once installed, the priority levels of all other EMMs should be changed to a different mastership priority level.

Use the following command to set the EMM in slot 3 to mastership priority 10:

ONline> set module 3 mastership_priority 10 [ENTER]

Once mastership priorities are assigned, you must issue the RESET MASTERSHIP command to initiate an election. During an election, the management module with the highest assigned mastership priority becomes the master. The new mastership setting is in effect immediately, but you must use the SAVE MODULE_PORT command to save this priority permanently.

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