Your customer adds two Brocade VDX 6740s to an existing Brocade VCS Fabric in logical
chassis mode with VCSID 11. After enabling logical chassis mode on both new switches, a
connection is made between the two switches. A cable is then connected between one of
the switches of the logical chassis. The ISL to the logical chassis is isolated with an
Exchange Switch Capabilities (ESC) error, detailing a database mismatch. What caused the
problem?

A.
enabling logical switch mode with the default configuration

B.
enabling logical chassis mode with a duplicate RBridge ID of the logical chassis

C.
connecting the two new switches together before adding to the logical chassis

D.
connecting only one ISL from the new switches to the logical chassis