D-Link DES 6000 Product Manual - Page 88

Advanced Settings, Apply, Auto-Partition Capability on All Ports, Head of Line HOL Blocking Prevention

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Modular Ethernet Switch User's Guide Advanced Settings Figure 7-7. Advanced Settings window 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. Web-Based Network Management 83

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Modular Ethernet Switch User’s Guide
Web-Based Network Management
83
Advanced Settings
Figure 7-7.
Advanced Settings window
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.