Linksys SGE2000 Cisco Small Business SFE/SGE2xxx Series Managed Switches Admin - Page 27
possible, by Automatic Unit ID Assignment., STEP 1
UPC - 745883572120
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Managing Device Information Managing Stacking 2 STEP 1 When inserting a unit into a running stack, units that are members of the existing stack retain their Unit IDs. Therefore: • If an automatically numbered unit was inserted into a running stack, the existing unit retains its Unit ID and the newer unit is reset to Unit ID=0. • If a manually numbered unit was inserted into a running stack, the existing unit retains its Unit ID and the manually numbered unit is shut down because its Unit ID cannot be changed automatically. STEP 2 When adding a unit to a stack at stack reset (boot), units with duplicate Unit IDs contend with each other for the same Unit ID according to the rules and restrictions imposed upon their unit class. • Master-enabled units with duplicate Unit IDs compete with each other in the Master Election. • If two units are contending for the same Unit ID, the Master decides as follows: - If one unit is manually numbered and the other unit is automatically numbered, the manually numbered unit retains its Unit ID and the automatically numbered unit is reset to Unit ID=0. - If both units are automatically numbered, the unit with the lower MAC address retains its Unit ID and the other unit is reset to Unit ID=0. - If both units are manually numbered, the unit with the lower MAC address retains its Unit ID and the other unit is shut down. STEP 3 Two manually numbered units with the same Unit ID can never be added or inserted into a stack simultaneously. Both units are shut down. STEP 4 When inserting new units into a running stack, if the resulting total number of old and new units exceeds the maximum allowed (eight), all the new units are shut down. STEP 5 Connecting more than the maximum number (eight) of units in a new stack may produce unpredictable results due to race conditions among the units. STEP 6 Any units that have been reset to Unit ID 0 are then reassigned new Unit IDs, if possible, by Automatic Unit ID Assignment. Cisco Small Business SFE/SGE Managed Switches Administration Guide 18