Avaya Virtual Services Platform 7000 Series Installation Manual page 49

Figure 22: FI up cable configuration
Note:
Avaya recommends you to use the FI down configuration. Many network management
software packages assume a down configuration.
Redundant Stack-mode configuration
The VSP 7000 Series switches support redundant Stack-mode. You can create a redundant
FI cable loop by connecting the Base unit to the unit physically at the bottom of the Stack. In
a redundant Stack-mode configuration, if a single unit fails, or if a FI cable is disconnected or
damaged, other units in the stack can remain operational without interruption.
In a redundant configuration, the software uses the FI cables to provide two paths between
units. If one path fails, the data can travel over the remaining path with half of the normal FI
bandwidth. The following is an example of how a redundant FI configuration reacts to a failed
connection.
Failure example:
• Unit 3 becomes non-operational due to a unit failure, cable disconnection, or power
loss.
• Units 2 and 4, upstream and downstream from Unit 3, sense the loss of Unit 3. The
software reroutes all data across the remaining path.
VSP 7000 installation
Stack-mode DToR configurations
July 2013 49