Reference Guide

• 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.
Automatic and Manual Stack Unit Failover
Stack unit failover is the process of the standby unit becoming a management unit.
Dell Networking OS fails over to the standby stack unit when:
1. Communication is lost between the standby and primary stack unit.
2. You request a failover via the CLI.
To display the reason for the last failover, use the show redundancy command from EXEC Privilege
mode.
Example of the show redundancy Command
Dell#show redundancy
-- Stack-unit Status --
------------------------------------------------
Mgmt ID: 0
Stack-unit ID: 0
Stack-unit Redundancy Role: Primary
Stack-unit State: Active
Stack-unit SW Version: 9.6(0.0)
Link to Peer: Down
Peer Stack-unit: not present
High Availability (HA)
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