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Stacking Dell PowerConnect 7000 Series Switches

NSF Example 1

Assume Unit 1 is the Stack Manager and Unit 2 is the Standby switch. The following scenarios illustrate

how the network recovers when Unit 1 is powered down.



With NSF disabled: Unit 2 takes over as Manager with a cold restart and clears the

hardware tables. The video stream stops on Hosts 2 and 3 for at least 30 seconds as the

OSPF adjacency is rebuilt, multicast routes are relearned, and spanning tree

reconverges.



With NSF enabled: Unit 2 takes over as Manager with a warm restart. OSPF graceful

restart keeps the adjacency with Router 1 up and Router 1 continues to forward to the

stack. There is no perceivable outage of the video stream through the stack.

NSF Example 2:

Assume Unit 2 is the Stack Manager and Unit 3 is the Standby switch, and both ports are active on the

LAG. In this scenario, NSF is enabled and the initiate failover command is used.



Because the unit with the root port goes down, the stack stops forwarding until the

spanning tree control plane comes back and places the link on Unit 3 in the forwarding

state (about 3 seconds).

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