Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.100.0 - Page 817

Figure 119. Supported Stacking Topologies High Availability on Stacks Stacks have master and standby management units analogous to Dell Networking route processor modules (RPM). The master unit synchronizes the running configuration and protocol states so that the system fails over in the event of a hardware or software fault on the master unit. In such an event, or when the master unit is removed, the standby unit becomes the stack manager and Dell Networking OS elects a new standby unit. Dell Networking OS resets the failed master unit: after online, it becomes a member unit; the remaining members remain online. Example of Stack Manager Redundancy Management Access on Stacks You can access the stack via the console port or VTY line. • Console access - You may access the stack through the console port of the master unit (stack manager) only. Similar to a standby RPM, the console port of the standby unit does not provide management capability; only a limited number of commands are available. Member units provide a limited set of commands. • Remote access - You may access the master unit and standby unit in a stack through the dedicated management Ethernet interfaces with SNMP, SSH, or via Telnet. Example of Accessing Non-Master Units on a Stack via the Console Port CONSOLE ACCESS ON A STANDBY Dell(standby)#? cd Change current directory clear Reset functions copy Copy from one file to another delete Delete a file dir List files on a filesystem disable Turn off privileged commands enable Turn on privileged commands Stacking 817