D-Link DES-6000 User Manual page 88

Advanced Settings
The first setting allows you to enable or disable port auto-partitioning by the Auto-Partition Capability on All
Ports function. If you enable auto-partitioning on all ports, when more than 62 collisions occur while a port is
transmitting data, the port automatically stops transmissions. The second setting allows you to enable or
disable the Head of Line (HOL) Blocking Prevention function. Click Apply to let your changes take effect.
The information above is described as follows:
♦ Auto-Partition Capability on All Ports This option offers Enable or Disable to decide whether to
auto-partition a selected port and take it offline or not.
♦ Head of Line (HOL) Blocking Prevention Head-of Line blocking occurs when a packet
originating on Port 1, for instance, needs to be forwarded to Ports 2 and 3. If Port 2 is occupied
(causing the packet to be held in memory until the port is free), the packet destined for Port 3 will
also be delayed, even though Port 3 may be free. Cumulatively, these delays can have a noticeable
effect on overall network performance. Enabling HOL Blocking Prevention prevents Head-of-Line
blocking from occurring, meaning that the packet destined for Port 3 gets delivered immediately.
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Figure 7-4. Advanced Settings window
Modular Ethernet Switch User's Guide
Web-Based Network Management