A network administrator is completing an In-Service Software Upgrade (ISSU) for an Intelligent Resilient
Framework (IRF) virtual devices. The device has two members. Each member has one management module.
Member1 is currently the master. The administrator has initiated a rollback time for this upgrade.
When should the administrator accept the upgrade?

A.
After upgrading both members of the IRF virtual device

B.
After checking the new software’s ISSU compatibility but before upgrading either member

C.
After upgrading member 1 but before switching over to and upgrading member 2

D.
After upgrading and switching over to member 2 but before upgrading member 1

Explanation:
Performing an ISSU for a multi-member IRF fabric
ISSU for a multi-member IRF fabric should be performed as per member in two steps: first upgrade a
subordinate member, and then upgrade the master and the other subordinate members.
08-ISSU configuration
http://www.h3c.com/portal/Technical_Support___Documents/Technical_Documents/Switches/
H3C_S12500_Series_Switches/Configuration/Operation_Manual/H3C_S12500_CG-Release7128-
6W710/01/201301/772597_1285_0.htm