Administrator Guide

• Border gateway protocol
• Open shortest path first
• Protocol independent multicast — sparse mode
• Intermediate system to intermediate system
Software Resiliency
During normal operations, the Dell Networking OS monitors the health of both hardware and software components in the background to
identify potential failures, even before these failures manifest.
System Health Monitoring
The Dell Networking OS also monitors the overall health of the system.
Key parameters such as CPU utilization, free memory, and error counters (for example, CRC failures and packet loss) are measured, and
after exceeding a threshold are used to initiate recovery mechanism.
Failure and Event Logging
Dell Networking systems provide multiple options for logging failures and events.
Trace Log
To track the execution of a program, developers interlace messages with software code.
These messages are called trace messages and are primarily used for debugging and to provide lower-level information than event
messages, which system administrators use. Dell Networking OS retains trace messages for hardware and software and stores them in
files (logs) on the internal flash.
• Trace Log — contains trace messages that relate to software and hardware events, state, and errors. Trace Logs are stored in
internal flash under the directory TRACE_LOG_DIR.
• Crash Log — contains trace messages that relate to IPC and IRC timeouts and task crashes on linecards and are stored under the
directory CRASH_LOG_DIR.
Core Dumps
A core dump is the contents of RAM a program uses at the time of a software exception and identifies the cause of the exception.
There are two types of core dumps: application and kernel.
• Kernel core dump — the central component of an OS that manages system processors and memory allocation and makes these
facilities available to applications. A kernel core dump is the contents of the memory the kernel uses at the time of an exception.
• Application core dump — the contents of the memory allocated to a failed application at the time of an exception.
System Log
Event messages provide system administrators diagnostics and auditing information.
The Dell Networking OS sends event messages to the internal buffer, all terminal lines, the console, and optionally to a syslog server. For
more information about event messages and configurable options, see Switch Management.
Control Plane Redundancy
The switch eliminates single points of failure by providing dedicated or load-balanced redundancy for various components.
To configure redundancy features, use the following commands.
High Availability (HA)
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