Dell C1048P Port Extender Networking C1048P Getting Started Guide - Page 17

Figure 8. C1048P Stack in a Ring Topology 1. C1048P stack 2. Mini-SAS cables attached in a ring topology The C1048P stack in Figure 8 is connected in a ring topology with the following physical connections between port extenders. The PEs are numbered Unit 0 to Unit 2. After you power on the stack units, the Stack Master LED on the C1048P that is elected master displays solid green. • The bottom mini-SAS port on the top unit is connected to the top mini-SAS port on the middle unit. • The bottom mini-SAS port on the middle unit is connected to the top mini-SAS port on the bottom unit. • The bottom mini-SAS port on the bottom unit is connected to the top mini-SAS port on the top unit. C1048P Standby A C1048P stack supports a standby or backup unit that assumes the stack master role if the master unit in the stack fails. The parent C9010 maintains a synchronized copy of the running configuration for the stack. When the system detects a stack-master failure, the C9010 initializes the standby unit and enables all other stack units with the current configuration. Although the standby unit is automatically selected in the stack, you can use the command-line interface on the C9010 or C1048P console to manually configure a different stack member as standby. For more information, see the Dell Networking Configuration Guide for C9000 Series Switches. Powering up the C1048P CAUTION: Read the safety information in the Safety and Regulatory Information manual and the safety information for C9000 Series switches that connect to the C1048P. Installing the Hardware 17