Connexium Managed Switches - Performance Optimization

1. Connexium Managed Switches - Performance Optimization

2. 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.

3. 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.

4. 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.

5. Connexium Managed Switch Global • Global settings configuration web page:

6. 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.

7. Range: (0…7) 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.

8. 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.

9. 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

10. 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.

11. 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

12. Connexium Managed Switch Differentiated Service Code Points (DSCP) • Configuration web page for DSCP:

13. 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)

14. 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

15. 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.

16. Switch Switch Fiber Ring Receives data Switch Publish data 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 Switch Switch Switch

17. Connexium Managed Switch GARP Multicast Registration Protocol (GMRP) • GMRP is enabled from the Configuration Web Page on a per port basis, as shown below.

18. 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

19. 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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