Four HP 3800 Series Switches have formed a backplane stack in a ring topology. Member 1 is the
commander the two stacking links on the member 1 fail. What happens?
A.
If LACP Multi-Active Detection (MAD) is enabled and the stack connects to a ProVision switch
on a link aggregation, member 2, 3 and 4 and shutdown the ports Otherwise, no ports are disabled
B.
If LACP Multi-Active Detection (MAD) is enabled member 1 shuts down all of its ports.
Otherwise, no ports are disabled
C.
If the split policy is one-fragment-up member 1 shuts down all of its ports
D.
If the switch policy is one-fragment-up members 2, 3, and 4 shut down all of their ports
Explanation:
Results of Disconnecting a Stacking Cable
If a stacking cable becomes disconnected from one of the switches in the stack, the effect
depends on the stacking topology that is being used:
Mesh—The stack topology is temporarily changed to a ring. To recover, simply reconnect the
stacking cable; the mesh topology and the previous stack configuration is restored.
Ring—There is little effect. The stack topology is temporarily changed to a chain topology. To
recover, simply reconnect the stacking cable; the ring topology and the previous stack
configuration is restored.
Chain—The following occurs:
• The smaller section (fragment) of the stack that results from the disconnection becomes
Inactive (the Stack Status value shown in the output of the show stacking command is Inactive).
• If the two resulting fragments are the same size, the fragment that contains the Commander will
be Active, and the other fragment becomes Inactive.
• Both fragments will have a Commander and a Standby selected (if there is more than one switch
in each fragment).
• When the stacking cable is reconnected to reform the chain:
– The Commander and Standby of the Active fragment retain those roles for the resulting stack. If
the original Commander was not in that fragment, then the stack will have a new Commander
when the stack is reformed.
– The switches in the Inactive fragment reboot and assume their new roles in the reformed
chain.Stack fragment – A stack that previously had more members (that is, some of its previous
members are now missing). The fragment can
be Active or Inactive based on the rules described.
• Active Stack fragment – When a stack becomes fragmented, only one fragment remains Active;
the other fragments become Inactive
(all network ports are disabled). The active stack fragment inherits the MAC address and IP
addressing of the stack for management. The
fragment that has more switches in it will be the Active fragment. This allows more of the network
ports to remain operational. If the fragments have the same number of switches in them, then the
fragment that has the original Commander will be the Active fragment.
• Inactive Stack fragment – The switches in this fragment do not actively switch packets. They
are powered on, however, the network
ceases to carry traffic. All user ports are disabled. Only the OOBM and stack ports remain active.
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