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Page 56 / 104 Scroll up to view Page 51 - 55
48
Chapter 5: Configuring the Switch through the Web Utility
QoS
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
ACL Priority
Use ACL CoS Mapping to set the output queue for packets matching an ACL rule as shown in the following table.
Note that the specified CoS value is only used to map the matching packet to an output queue; it is not written to
the packet itself.
Port
. Port identifier.
Name
. Name of ACL.
Type
. Type of ACL (IP or MAC).
CoS Priority
. CoS value used for packets matching an IP ACL rule. (Range: 0-7)
ACL CoS Priority Mapping
. Displays the configured information.
Select an ACL rule, specify a CoS priority, then click
Add
.
To remove an ACL CoS priority mapping click the
Remove
button in the row of the entry you wish to remove.
Table 2:
Queue
0
1
2
3
Priority
1,2
0,3
4,5
6,7
Figure 5-30: QoS - ACL Priority
Page 57 / 104
49
Chapter 5: Configuring the Switch through the Web Utility
QoS
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
Rate Limit
This function allows the network manager to control the maximum rate for traffic transmitted or received on an
interface. Rate limiting is configured on interfaces at the edge of a network to limit traffic coming out of the
switch. Traffic that falls within the rate limit is transmitted, while packets that exceed the acceptable amount of
traffic are dropped.
Rate limiting can be applied to individual ports or lags. When an interface is configured with this feature, the
traffic rate will be monitored by the hardware to verify conformity. Non-conforming traffic is dropped,
conforming traffic is forwarded without any changes.
The rate limit screen displays both Fast Ethernet Granularity and Gigabit Granularity.
Rate limit granularity is an additional feature enabling the network manager greater control over traffic on the
network. The “rate limit granularity” is multiplied by the “rate limit level” to set the actual rate limit for an
interface. Granularity is a global setting that applies to Fast Ethernet or Gigabit Ethernet interfaces.
Use the drop-down menus to change the rate limit for fast ethernet and/or gigabit granularity, click
submit
.
Set the Input Rate Limit Status or Output Rate Limit Status, then set the rate limit for the individual interfaces, and
click
Apply
.
To configure input rate limit for each port or lag, click
Port Conf
or
Trunk Conf
in the Input row of the table
respectively.
To configure output rate limit for each port or lag, click
Port Conf
or
Trunk Conf
in the Output row of the table
respectively.
Rate Limit Configuration
To configure Port Input Rate Limit, click the Enable checkbox and then set the rate limit level in the textfield
provided.
Port Rate Output Limit is configured the same way on the Port Output Rate Limit Configuration screen.
If a port is assigned as a lag member then the rate limit of that port cannot be set in the port configuration
screen.
Truck Rate Limit is configured the same way as port rate limit using the trunk Input and output screens.
Figure 5-31: QoS - Rate Limit
NOTE:
When the rate limit granularity is set to a low
value (for 10/100 ports, less than 512 Kbps), the
maximum bandwidth available on ports is restricted to
a value that is "256 x granularity." This restriction also
applies to ports with rate limiting disabled.
Page 58 / 104
50
Chapter 5: Configuring the Switch through the Web Utility
DiffServ
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
DiffServ
The commands described in this section are used to configure Quality of Service (QoS) classification criteria and
service policies. Differentiated Services (DiffServ) provides policy-based management mechanisms used for
prioritizing network resources to meet the requirements of specific traffic types on a per hop basis. Each packet
is classified upon entry into the network based on access lists, IP Precedence, DSCP values, or VLAN lists. Using
access lists allows you select traffic based on Layer 2, Layer 3, or Layer 4 information contained in each packet.
Based on configured network policies, different kinds of traffic can be marked for different kinds of forwarding.
All switches or routers that access the Internet rely on class information to provide the same forwarding
treatment to packets in the same class. Class information can be assigned by end hosts, or switches or routers
along the path. Priority can then be assigned based on a general policy, or a detailed examination of the packet.
However, note that detailed examination of packets should take place close to the network edge so that core
switches and routers are not overloaded.
Switches and routers along the path can use class information to prioritize the resources allocated to different
traffic classes. The manner in which an individual device handles traffic in the DiffServ architecture is called per-
hop behavior. All devices along a path should be configured in a consistent manner to construct a consistent end-
to-end QoS solution.
The DiffServ tab includes links to the following screens.
•
DiffServ Class Map
•
DiffServ Policy Map
•
DiffServ Service Policy
Page 59 / 104
51
Chapter 5: Configuring the Switch through the Web Utility
DiffServ
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
DiffServ Class Map
A class map is used for matching packets to a specified class.
Class Name
. Name of the class map. (Range: 1-32 characters)
Type
. Only one match command is permitted per class map, so the match-any field refers to the criteria specified
by the lone match command.
Description
. A brief description of a class map. (Range: 1-256 characters)
Modify Name and Description
. Configures the name and a brief description of a class map. (Range: 1-32
characters for the name; 1-256 characters for the description) Select the entry you wish to change, enter your
changes and click the
Modify Name & Description
button.
Edit Rules
. Opens “Match Class Settings” for the selected class entry. Modify the criteria used to classify ingress
traffic.
Add Class
. Opens “Class Configuration”. Enter a class name and description and click
Add
to open “Match Class
Settings”. Enter the criteria used to classify ingress traffic.
Remove Class
. Removes the selected class.
Click
Add Class
to create a new class, or select a class and click
Edit Rules
to change the rules of the selected
class, or
Remove Class
to delete the class.
Setting Rules
Class Name
. List of class maps.
ACL List
. Name of an access control list. Any type of ACL can be specified, including standard or extended IP
ACLs and MAC ACLs. (Range: 1-16 characters)
IP DSCP
. A DSCP value. (Range: 0-63)
IP Precedence
. An IP Precedence value. (Range: 0-7)
Add
. Adds the specified criteria to the class. Only one entry is permitted per class.
Remove
. Deletes the selected criteria from the class.
Figure 5-32: DiffServ - Diffserv Class Map
Figure 5-33: DiffServ Class Map - Setting Rules
Page 60 / 104
52
Chapter 5: Configuring the Switch through the Web Utility
DiffServ
24-Port 10/100 + 2-Port Gigabit Switch with Webview and Power over Ethernet
Add rules to a selected class using the ACL list drop-down menu and the IP DSCP, IP Precedence and VLAN text
fields provided then click
Add
.
Adding a Class
Class Name
. Name of the class map. (Range: 1-32 characters)
Type
. Only one match command is permitted per class map, so the match-any field refers to the criteria specified
by the lone match command.
Description
. A brief description of a class map. (Range: 1-256 characters)
Add
. Adds the specified class.
Back
. Returns to previous screen without making any changes.
Enter the class name and description into the textfields provided in the Add Class screen, then click
Add
.
Figure 5-34: DiffServ Class Map - Adding a Class

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