Features
General Features
Head of Line Blocking Prevention
Head of Line (HOL) blocking results in traffic delays and frame loss caused by traffic competing for the same egress port resources. HOL blocking queues packets, and the packets at the head of the queue are forwarded before packets at the end of the queue. By default, the device is configured so that the HOL blocking prevention mechanism is active at all times, except when QoS (Quality of Service), Flow Control or Back Pressure is active on a port where the HOL blocking prevention mechanism is disabled on the whole system.
Management Modes
•Unmanaged Mode — Operates independent of
•Managed Mode — Provides switch management through a web interface, and maintains the device configuration through power cycles. From Managed Mode, when the Managed Mode button is pressed, the switch enters Unmanaged Mode.
•Secure Mode (PowerConnect 2748 only) — Secure Mode works by the user configuring the switch in Managed Mode and then enabling Secure Mode. Once enabled, it prevents users from making any further configuration changes to the switch. This is done by removing the IP address to the switch so that it becomes inaccessible. In Secure Mode the switch retains configuration through power cycles just like Managed Mode. To use Secure Mode, the user puts the switch in Managed Mode, configures the switch as desired, and then switches to Secure Mode via the web interface. To exit Secure Mode, the user presses the Managed Mode button. From Secure Mode when the Managed Mode button is pressed, the switch enters Managed Mode default configuration with the default IP address of 192.168.2.1.
Back Pressure Support
On
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