Specifications

Port Configuration Command Set
Setting Flow Control and Thesholds
4-40 Matrix E1 Series (1G58x-09 and 1H582-xx) Configuration Guide
4.2.6.6 set port holbp
Use this command to enables or disable Head of Line (HOL) Blocking Prevention for one or more
ports. HOL Blocking Prevention drops frames after a pre-defined number of frames are queued to
a congested port. This prevents flow control from hampering other uncongested ports at the expense
of dropping frames to the congested port.
set port holbp port-string {ingress | egress}{enable | disable}
Syntax Description
Command Defaults
None.
Command Type
Switch command.
Command Mode
Read-Write.
Example
This example shows how to enable egress HOL Blocking Prevention on Fast Ethernet front panel
port 2:
port-string Specifies the port(s) for which to enable or disable HOL
Blocking Prevention. For a detailed description of possible
port-string values, refer to Section 4.1.2.
ingress | egress Enables or disables HOL Blocking Prevention on ingress
(just entered the switch) or egress (in the system and before
transmission) frames.
enable | disable Enables or disables HOL Blocking Prevention.
NOTES: If switch ports are congested, disabling
HOL Blocking Prevention without enabling flow
control will result in frames being dropped at the
ingress port (in addition to causing potentially
unnecessary congestion inside the switch).
Matrix>set port holbp fe.0.2 egress enable