Table 56: Custom Application Settings
Field
Description
Group
Internet applications are organized in groups based on the type or
purpose of the application. Once you select an Application Group, the
Application Name drop-down is populated with application names
that are part of the specified group.
The group names are pre-defined standard Extreme Application
Analytics
™
signature groups. The group names are case-sensitive.
Name
The name of the custom application.
Pattern
The Matching Pattern is the URL pattern that is associated with the
application (case-sensitive, up to 64 characters).
Class of Service
In general, COS refers to a set of attributes that define the importance of a frame while it is forwarded
through the network relative to other packets, and to the maximum throughput per time unit that a
client or port assigned to the role is permitted. The CoS defines actions to be taken when rate limits are
exceeded.
A role can contain default access control (VLAN) and/or Class of Service (priority) characteristics that
will be applied to traffic when the rule either allows traffic, or does not specifically disallow traffic and
the last rule is ALLOW ALL.
Class of Service is a 3-bit field that is present in an Ethernet frame header when 802.1Q VLAN tagging is
present. The field specifies a priority value between 0 and 7, more commonly known as CS0 through
CS7. These values can be used by QoS disciplines to differentiate and shape or police network traffic.
CoS operates only on 802.1Q VLAN Ethernet at the data link layer (Layer 2), which other QoS
mechanisms (such as DiffServ, also known as DSCP) operate at the IP network layer (Layer 3).
After packets are classified, they are assigned a final User Priority (UP) value, which consists of the
Priority and ToS/DSCP. Marking bits to be applied to the packet is taken from the CoS, and if the value is
not set, then the received value (ToS/DSCP) is used. ToS/DSCP Marking rewrites the Layer 3 Type of
Service (ToS) byte.
Related Links
on page 136
Configuring CoS
The set of rules included in a role, along with any access or CoS defaults, determine how all network
traffic of any client assigned to the role will be handled. For example, a Doctor role can be assigned a
higher priority CoS and default access control due to the sensitivity and urgency of services that a
doctor provides to patients.
1 Go to
Configure
>
Policy
>
Class of Service
.
2 Select
Add
, or select an existing Class of Service from the list.
Configure
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