VBrick dme Admin Manual page 95

Field
Differentiated Services Differentiated Services (DiffServ) is a course-grained mechanism
Cache System Settings
Used
DME Admin Guide
Description
and setting that can be used to help manage a network's quality-of-
service (QoS). The setting, which is 1 byte entered as decimal, is
injected into the IP header to allow QoS for the data packet for
UDP and TCP.
Please consult your network administrator before using this
feature.
DiffServ takes up the first 6 bites of the 1-byte value you enter.
The DS field structure is presented below:
Therefore, any value you intend to use will fill the first 6 bits, with
the 7th and 8th unused. The two tables below this one outline the
correct entries for a number of common DiffServ settings.
Note: Additional information can be found in RFC2474 https://
www.ietf.org/rfc/rfc2474.txt, and RFC2475 https://
tools.ietf.org/html/rfc2475.
Note: Use of Explicit Congestion Notification (ECN) (in the 7th
and 8th bit) is not covered here. Please see RFC3168 https://
tools.ietf.org/html/rfc3168. This value is in decimal.
Note: This is currently not available for HLS and HDS streams.
IMPORTANT: This value, when changed, is not automatically
propagated through all outgoing lines and their headers. To do so,
would disrupt any playback. Therefore, when resetting this value,
all outgoing lines must be disabled and then re-enabled for this
value to be used within each of the streams' headers. It is not
sufficient to disable or reboot the server.
Defaults (7530/7550/7570): 0/0/0
Be aware that this setting has a direct impact on memory and disk
usage. If not configured properly, system memory will not be
available for other functions. Do not change the default (Normal)
unless you will be using the DME for a different function as
explained below.
• Low – the DME will not be used for caching.
• Normal – the DME will be used primarily as a reflector and
secondarily as a caching engine.
• High – the DME will be primarily used as a caching engine and
secondarily as a reflector.
• Dedicated – the DME will be used exclusively for caching.
See Caching for additional details.
Defaults (7530/7550/7570): Normal/Normal/Normal
System Configuration
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