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:
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.
Note: 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.
Advanced Traffic Management Guide, 3800 Switches
http://h20565.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c03018186