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Knowledge Base

The Link Between a Brocade Switch and Cisco Switch Is Down

Publication Date:  2013-12-12  |   Views:  1616  |   Downloads:  0  |   Author:  x00482952  |   Document ID:  EKB1000037511


Issue Description

A Brocade switch is connected to Cisco9134 switch 19 using a multi-mode optical fiber. The port indicator is in the normal state. However, the port is in the down state on the Cisco switch:
fc1/19 is down (Isolation due to zone merge failure)
The optical fiber link between the blade and the Cisco switch is down.

Alarm Information

The port is in the down state on the Cisco switch.

Handling Process

Enable the AG mode for the Brocade switch. On the Brocade switch, each port that connects to a blade is mapped to 15 ports (external ports that connect to the Cisco switch). Enable the NPIV function of the Cisco switch. Then the link between the Brocade switch and Cisco switch is up. For details, see the attachment.

Root Cause

Heterogeneous Fibre Channel switches must be interconnected in AG mode.


Connect heterogeneous Fibre Channel switches in AG mode.