Users Guide

• Trace Log — contains trace messages related 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 related to IPC and IRC timeouts and task crashes on line cards
and is 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 is used to
identify the cause of the exception.
There are two types of core dumps: application and kernel.
• Kernel core dump is the central component of an operating system that manages system processors
and memory allocation and makes these facilities available to applications. A kernel core dump is the
contents of the memory in use by the kernel at the time of an exception.
• Application core dump is 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.
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, refer to
Switch Management.
Hot-Lock Behavior
Dell Networking OS hot-lock features allow you to append and delete their corresponding content
addressable memory (CAM) entries dynamically without disrupting traffic. Existing entries are simply shuffled
to accommodate new entries.
Hot-Lock IP ACLs allow you to append rules to and delete rules from an access control list (ACL) that is
already written to CAM. This behavior is enabled by default and is available for both standard and extended
ACLs on ingress and egress. For information about configuring ACLs, refer to Access Control Lists (ACLs).
Component Redundancy
Dell Networking systems eliminate single points of failure by providing dedicated or load-balanced
redundancy for each component.
High Availability (HA) 443