Dell PowerConnect PC7024 Anweisungen zum Stapeln - Seite 32
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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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