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Conguring Quality of Service
A.2 Trac Shaping
A
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© 2011 Verizon. All Rights Reserved.
To add a policing class, click 11. Add in the “Rx Traffic Policing section of the
Edit Device Traffic Shaping screen. An Add Policing Class screen appears.
Enter the name of the new policing class in the “Name text box, then click
Apply. To configure the parameters of the new policing class, follow the
instructions in step 10, above.
When finished with all device traffic shaping, click 12. Apply in the Edit Device
Traffic Shaping screen.
A.2c Ingress Data
The FiOS Router can control outgoing data fairly easily. It can queue packets,
delay them, give precedence to other packets, or drop them. This helps in
resolving upload (Tx) traffic bottlenecks, and in most cases is sufficient. However,
in the case of download (Rx) traffic bottlenecks, the ability to control the flow is
much more limited. The FiOS Router cannot queue packets, since in most cases
the local network (LAN) is much faster than the Internet (WAN), and when the
FiOS Router receives a packet from the Internet, it passes it immediately to the
local network.
QoS for ingress data has the following limitations, which do not exist for
outgoing data:
QoS can only be applied to TCP streams (UDP streams cannot be delayed);•
no borrowing mechanism;•
and when reserving Rx bandwidth, it is strictly taken from the bandwidth of •
all other classes.
Furthermore, the FiOS Router cannot control the behavior of the ISP, which may
not have proper QoS handling. Unfortunately, this is a common situation. Let’s
look at a scenario of downloading a large file and surfing the Internet at the
same time. Downloading the file is distinguished by small requests, followed
by very large responses. This may result in blocking HTML traffic at the ISP.
A solution for such a situation is limiting the bandwidth of low-priority TCP
connections (such as the file download).
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