Cisco Cisco TelePresence MCU 4510 Maintenance Manual
Configuring QoS settings
Cisco TelePresence MCU Version 4.2 Printable online help
Page 198 of 252
ToS configuration
ToS configuration represents a tradeoff between the abstract parameters of precedence, delay,
throughput, and reliability.
throughput, and reliability.
ToS uses six out of a possible eight bits. The MCU allows you to set bits 0 to 5, and will place zeros
for bits 6 and 7.
for bits 6 and 7.
Bits 0-2 set IP precedence (the priority of the packet).
Bit 3 sets delay: 0 = normal delay, 1 = low delay.
Bit 4 sets throughput: 0 = normal throughput, 1 = high throughput.
Bit 5 sets reliability: 0 = normal reliability, 1 = high reliability.
Bits 6-7 are reserved for future use and cannot be set using the MCU interface.
You need to create a balance by assigning priority to audio and video packets whilst not causing
undue delay to other packets on the network. For example, do not set every value to 1.
undue delay to other packets on the network. For example, do not set every value to 1.
DiffServ configuration
DiffServ uses six out of a possible eight bits to set a codepoint. (There are 64 possible codepoints.)
The MCU allows you to set bits 0 to 5, and will place zeros for bits 6 and 7. The codepoint is
interpreted by DiffServ nodes to determine how the packet is treated.
The MCU allows you to set bits 0 to 5, and will place zeros for bits 6 and 7. The codepoint is
interpreted by DiffServ nodes to determine how the packet is treated.
Default settings
The default settings for QoS are:
Audio 101110:
•
For ToS, this means IP precedence is set to 5 giving relatively high priority. Delay is set to
low, throughput is set to high, and reliability is set to normal.
low, throughput is set to high, and reliability is set to normal.
•
For Diff Serv, this means expedited forwarding.
Video 100010:
•
For ToS, this means IP precedence is set to 4 giving quite high priority (but not quite as high
as the audio precedence). Delay is set to normal, throughput is set to high, and reliability is
set to normal.
as the audio precedence). Delay is set to normal, throughput is set to high, and reliability is
set to normal.
•
For DiffServ, this means assured forwarding (codepoint 41).
To return the settings to the default settings, click Reset to default.