Netgear XCM8806 - 8800 SERIES 6-SLOT CHASSIS SWITCH 사용자 설명서
Chapter 15. QoS
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NETGEAR 8800 User Manual
File Server Applications
With some dependencies on the network operating system, file serving typically poses the
greatest demand on bandwidth, although file server applications are very tolerant of latency,
jitter, and some packet loss, depending on the network operating system and the use of TCP
or UDP.
greatest demand on bandwidth, although file server applications are very tolerant of latency,
jitter, and some packet loss, depending on the network operating system and the use of TCP
or UDP.
Traffic Groups
A traffic group defines the ingress traffic to which you want to apply some level of QoS. You
can use the XCM8800 software to define traffic groups based on the following:
can use the XCM8800 software to define traffic groups based on the following:
•
Frame or packet header information such as IP address or MAC address
•
Class of Service (CoS) 802.1p bits in the frame header
•
DiffServ information in a packet header
•
Ingress port number
•
VLAN ID
Traffic groups that are defined based on frame or packet information are usually defined in
Access Control Lists (ACLs). The exception to this rule is the CoS and DiffServ information,
which you can use to define traffic groups without ACLs.
Access Control Lists (ACLs). The exception to this rule is the CoS and DiffServ information,
which you can use to define traffic groups without ACLs.
The function of the CoS and DiffServ traffic groups is sometimes referred to as explicit packet
marking, and it uses information contained within a frame or packet to explicitly determine a
class of service. An advantage of explicit packet marking is that the class of service
information can be carried throughout the network infrastructure, without repeating what can
be complex traffic group policies at each switch location. Another advantage is that end
stations can perform their own packet marking on an application-specific basis. NETGEAR
switch products have the capability of observing and manipulating packet marking
information with no performance penalty.
marking, and it uses information contained within a frame or packet to explicitly determine a
class of service. An advantage of explicit packet marking is that the class of service
information can be carried throughout the network infrastructure, without repeating what can
be complex traffic group policies at each switch location. Another advantage is that end
stations can perform their own packet marking on an application-specific basis. NETGEAR
switch products have the capability of observing and manipulating packet marking
information with no performance penalty.
The CoS and DiffServ capabilities (on supported platforms) are not impacted by the switching
or routing configuration of the switch. For example, 802.1p information can be preserved
across a routed switch boundary and DiffServ code points can be observed or overwritten
across a Layer 2 switch boundary.
or routing configuration of the switch. For example, 802.1p information can be preserved
across a routed switch boundary and DiffServ code points can be observed or overwritten
across a Layer 2 switch boundary.
During QoS configuration, you configure the QoS level first by configuring QoS profiles, traffic
queues, and meters, and then you define a traffic group and assign the traffic group to the
QoS configuration. The following sections provide additional information on the traffic groups
you can define:
queues, and meters, and then you define a traffic group and assign the traffic group to the
QoS configuration. The following sections provide additional information on the traffic groups
you can define: