Transcript Port Configuration - Schneider Electric

Connexium Managed Switches Performance Optimization
Connexium Managed Switch
Performance Optimization
● The Connexium Managed Switches include features that allow traffic
prioritization to optimize performance based on the application
requirements.
● The following examples use the web interface switch configurator to
illustrate the configuration of these features along with additional switch
capabilities that can be used to optimize performance.
Schneider Electric - Connectivity Products – Joe Benedetto – October 2010
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Connexium Managed Switch
Performance Optimization
● Configurable performance parameters in the QoS/ Priority Menu
● Global – Set VLAN priority and IP-DSCP value for management packets
● Port Configuration- Assign a priority to the port, for packets with no priority
information
● IEEE 802.1D/p Mapping – Allows the assignment of traffic classed to every
VLAN priority
● IP Differentiated Service Code Points (DSCP) – Assigns a traffic class to
prioritize traffic.
● Additional switch performance capabilities include
● Fast Aging after Disconnection - All device addresses learned by a
port are removed from the switch buffer if the link goes down.
● GMRP and IGMP – For multicast message filtering
● Flow Control - Limits traffic during times of high traffic and transmits a “Pause”
frame to the end device, indicating the device should stop sending data.
Schneider Electric - Connectivity Products – Joe Benedetto – October 2010
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Connexium Managed Switch
Global
● The Global web page allows the selection of the following:
● VLAN Priority - Enables setting of priority levels 0 to 7, based on the traffic
classes (see slide 8). This allows management data packets to be
transmitted based on their priority level during periods of high network load.
● IP-DSCP Value - Enables the setting of priority levels 0 to 63. This allows
the device to be configured to prioritize management data packets.
● Number of queues per port (up to 4)
● Trust Mode - Specifies how the device handles data packets with priority
information.
●Untrusted – Ignores the priority information in the data packets and
always assigns the port priority to the packet of the receiving port.
●trustDot1p – Prioritizes received data packets containing VLAN tag
information according to its information. If there is no VLAN tag
information then the priority is set per the port priority.
●trustlpDscp - Prioritizes received data packets containing the DSCP
value according to the value received. If there is no DSCP value then the
priority is set per the port priority.
Schneider Electric - Connectivity Products – Joe Benedetto – October 2010
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Connexium Managed Switch
Global
● Global settings configuration web page:
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Connexium Managed Switch
Port Configuration/Priority
● Allows the assignment of data packet priority to a specific port
● The port priority settings can be set using the web page as shown
below as part of the switch configuration.
Schneider Electric - Connectivity Products – Joe Benedetto – October 2010
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Connexium Managed Switch
Port Priority
● Data packets with no priority information (no VLAN or priority tag) will be
transmitted according to the priority of the port on the switch
● For each port, packet priority can be defined separately:
0 = low priority and 7 = high priority
● The port priority settings can be set using the web page as shown below
as part of the switch configuration
● Port Priority is associated to the Traffic Class which is shown in the table
on the next slide.
Range: (0…7)
Schneider Electric - Connectivity Products – Joe Benedetto – October 2010
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Connexium Managed Switch
Port Priority
● Below is a table that displays the conversion of the Port Priority value to
the Traffic Class and Traffic Type.
Schneider Electric - Connectivity Products – Joe Benedetto – October 2010
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Connexium Managed Switch
IEEE 802.1D/p Mapping
● Allows the assignment of traffic class to every VLAN priority
● For each port, the traffic class can be defined separately, 0 to 3
Schneider Electric - Connectivity Products – Joe Benedetto – October 2010
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Connexium Managed Switch
IEEE 802.1D/p Mapping
● Below is the table from slide # 8 that includes the Traffic Class and the
IEEE 802.1D Traffic Type.
Schneider Electric - Connectivity Products – Joe Benedetto – October 2010
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Connexium Managed Switch
IP DSCP (Differentiated Service Code Points)
● The IP DSCP mapping table allows you to assign a traffic class to every
DSCP value
● The different DSCP values assign the device fowarding behavior
● Class Selector (CS0-CS7); compatibility to TOS/IP precedence
● Expedited Fowarding (EF); Premium service, reduced delay, jitter, and
packet loss
● Assumed Fowarding (AF); A differentiated schema for handling different
data traffic
● Default Fowarding/Best Effort; No particular prioritzing
Schneider Electric - Connectivity Products – Joe Benedetto – October 2010
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Connexium Managed Switch
Differentiated Service Code Points (DSCP)
● Configuration web page for DSCP:
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Connexium Managed Switch
Fast Aging after Disconnection
● If a device learned by a switch port goes down, its address is removed
from the switch buffer independent of any time settings
● A device address is removed from the switch buffer after the aging time
has been reached if no traffic is received
● Aging time is set in the Configuration Web Page for Global, the range is 10
to 630 seconds (unit: 1 second; default setting: 30)
Schneider Electric - Connectivity Products – Joe Benedetto – October 2010
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Connexium Managed Switch
Flow Control
● Flow control is an overload protection feature that restricts switch port
traffic during periods of heavy traffic
● Conforms to the IEEE 802.3x specification
● Flow Control is selected from the Port Configuration Web Page
Schneider Electric - Connectivity Products – Joe Benedetto – October 2010
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Connexium Managed Switch
GARP Multicast Registration Protocol (GMRP)
● GMRP enables the distribution of data packets with a multicast address
as the destination address
● A device can send a restricted “Broadcast” to a group of recipients
using multicast messaging
● Devices that want to receive data packets use GMRP to register to the
multicast address
● Data packets with unregistered multicast addresses are sent to all ports
by the switch
● GMRP allows the synchronization of distributed applications (nodes
receive information simultaneously)
● GMRP enables optimized traffic load, as messages can be broadcast to
a subset of devices.
Schneider Electric - Connectivity Products – Joe Benedetto – October 2010
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Connexium Managed Switch
GARP Multicast Registration Protocol (GMRP)
●A typical network configuration, shown below, has 1 device that is
publishing data and multiple devices that are receiving data
Switch
Switch
Fiber Ring
Switch
Switch
Switch
Switch
Publish data
Switch
Schneider Electric - Connectivity Products – Joe Benedetto – October 2010
Receives data
Switch
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Connexium Managed Switch
GARP Multicast Registration Protocol (GMRP)
● GMRP is enabled from the Configuration Web Page on a per port basis,
as shown below.
Schneider Electric - Connectivity Products – Joe Benedetto – October 2010
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Connexium Managed Switch
IGMP (Internet Group Management Protocol)
● IGMP is a communication protocol used to manage the membership of
multicast groups, similar in function to GMRP
● Components of IGMP include
● Producer – Source of the multicast traffic
● Consumer (s) – Destination of the multicast traffic
● Querier – “Traffic cop" and the "logical source" of multicasts in an IGMP
environment
● IGMP Snooping allows the switch to monitor the IGMP membership
queries, to register the consumers to the appropriate port and stop the
multicast messages from traveling to unregistered devices
Schneider Electric - Connectivity Products – Joe Benedetto – October 2010
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Connexium Managed Switch
IGMP (Internet Group Management Protocol)
● The Configuration Web Page allows the:
● Activation/deactivation of the IGMP snooping protocol
● Configuration of the IGMP Snooping protocol globally and per port
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Questions?
Make the most of your energy
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