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Network controll

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Network Control Network Topics covered in this paper What is QoS? What is IGMP Snooping? What is VLAN? QoS QoS What is QoS? Quality of Service (QoS) provides Traffic Prioritization Capability to ensure that important data is delivered consistently and predictably. When Do We Need QoS? Aggregation Speed Mismatch LAN to WAN 10 Mbps 10 Mbps 100 Mbps 64 Kbps EDS-508 QoS to Increase Determinism Supports interoperable IEEE Standard 802.1p/1Q, to maintain a consistent QoS policy across a switch Supports Layer 3 TOS/DiffServ Collected Data Control Message Mgt. Message Lo w Pr ior ity Top Priority ity or i Pr h Hig Low Priority High Priority Top Priority Data collected Mgt. Message Control Message Layer 2: 802.1p/802.1Q CoS Layer 2 of 802.1Q frame: Each packet uses 3 bits Class-Of-Service (COS) carries classification information Layer 3: DiffServ/ToS Layer 3 DiffServ Architecture: Each packet uses Type-OfService (TOS) field in IP header to carry classification information (Differentiated Services Code Point - DSCP) QoS Classification Settings Strict or Weighted Fair Low/Normal/ Medium/High CoS Mapping TOS Mapping QoS Summary QoS maximizes your current network bandwidth. IGMP Snooping IGMP Why IGMP Snooping? Multicast Service IGMP Good for one-to-many traffic The most widely used IP multicast protocol in WAN IGMP Snooping Makes LAN environment multicast aware Unicast vs. Multicast Unicast Application: Repeatedly sends the same unicast packets to multiple hosts 1 1 2 Router 3 1 Router 2 2 Router 2 3 Router 3 Router 3 Multicast Application: Sends one multicast packet to multiple hosts 1 1 1 Router 1 Router Router 1 1 Router 1 1 Router Why IGMP Snooping? Multicast Service IGMP IGMP Snooping Good for one-to-many traffic The most widely used IP multicast protocol in WAN Makes LAN environment multicast aware What is IGMP? Internet Group Management Protocol (IGMP) How hosts tell routers about group membership Routers query group membership from host on the connected LAN RFC 1112: IGMP V1 RFC 2236: IGMP V2 (Current version) IGMP v3 is prepared Supported on UNIX, PC, MACs. Example: IGMPv1 Joining a Group Host 1 Host 2 Host 3 224.1.1.1 Report Router Joining member sends report to 224.1.1.1 immediately upon joining IP Multicast address 224.0.0.0 ~ 239.255.255.255 (Class D address) 224.0.0.1 The multicast address for all hosts on subnet 224.0.0.2 The multicast address for all routers on subnet Example: IGMPv1 General Queries Host 1 Host 2 Host 3 Router General query to 224.0.0.1 Periodically sends general queries to 224.0.0.1 to determine membership IP Multicast address 224.0.0.0 ~ 239.255.255.255 (Class D address) 224.0.0.1 The multicast address for all hosts on subnet 224.0.0.2 The multicast address for all routers on subnet Why IGMP Snooping? Multicast Service Good for one-to-many traffic IGMP The most widely used IP IGMP Snooping Makes LAN environment multicast protocol in WAN multicast aware IGMP Snooping Helps Save Bandwidth All end stations need to handle the traffic whether they need it or not. Group 1 Multicast Stream Group 2 Multicast Stream Without IGMP Snooping Flooding Traffic IGMP Group 2 IGMP Group 1 IGMP Group 2 IGMP Group 1 IGMP Snooping helps Save Bandwidth End stations only receive dedicated traffic belonging to the same group. Group 1 Multicast Stream Group 2 Multicast Stream With IGMP Snooping Filter Traffic IGMP Group 2 IGMP Group 1 IGMP Group 2 IGMP Group 1 IGMP Snooping Settings Set the query interval of Querier function globally. Enable the IGMP Snooping function globally. Enable the IGMP Snooping function per VLAN. Add entry Select which ports are connecting to the multicast routers. Enable the querier function of EDS-508. IGMP Table Add Static Multicast MAC Select the join ports of this multicast group Input the desired multicast MAC address. 01:00:5E:00:00:00 01:00:5E:FF:FF:FF IGMP Snooping Summary IGMP Snooping makes switch IGMP aware to establish the best path for multicast service, to save LAN bandwidth. VLAN VLAN What is VLAN? A Virtual LAN (VLAN) is a group of devices that can be located anywhere on a network, but which communicate as if they are on the same physical segment. With VLANs, you can easily segment your network logically without being restricted by physical connections VLAN1 VLAN2 VLAN3 Floor 3 Floor 2 Floor 1 Benefits of a VLAN VLANs ease network changes VLANs enhance network security VLANs help control traffic VLANs ease network changes VLANs allow you to group devices as if they are connected by physical connections. You do not need to do any re-cabling. VLAN1 VLAN2 VLAN3 Floor 3 Floor 2 Floor 1 VLANs enhance network security Devices within each VLAN can only communicate with other devices on the same VLAN. VLAN ? VLAN 1 VLAN 2 VLAN 3 VLANs help control traffic Increases efficiency by separating traffic from different groups to prevent wasting unwanted broadcast/multicast packets. VLAN 1 VLAN 2 VLAN 3 802.1Q Tag Frame Uses an extra tag in the MAC header to identify the VLAN membership of a frame across switch/bridges. This tag is used for VLAN and QoS priority identification. 1,518 bytes 1,522 bytes 802.1Q Tag Frame Priority: The first three bits of the TCI define user priority, giving eight (2^3) priority levels. VID: VLAN ID identifies the VLAN, which is basically used by the standard 802.1Q. The ID has 12 bits, allowing the identification of 4096 (2^12) VLANs. Of the 4096 possible VIDs, a VID of 0 is used to identify priority frames and value 4095 (FFF) is reserved, so the maximum possible VLAN configurations are 4,094. Configuration of a VLAN Access Port is used to connect single devices without tag. Trunk Port connects another 802.1Q VLAN aware switch /hubs. Hybrid Port connects LAN that combines tagged and/or untagged devices and/or other switches Trunk Port Trunk Port Access Port Access Port Hybrid Port Hybrid Port Untagged Untagged device device Untagged device Tagged Untagged device device Access Port Access Port is used to connect single devices without tag. The VLAN Switch adds a tag (PVID) to received packets, and removes tag when transmitting packets Only one specific PVID for each port Over 90% of devices are untagged Access Port Access Port Untagged PVID 1 device Untagged PVID 1 device VLAN 1 Untagged PVID 2 device Untagged PVID 2 device VLAN 2 Access Port Settings Set the port default VLAN ID for untagged devices that connect to the port Designate this port as Access Port Management VLAN Management VLAN ID should be set exactly as the port s VPID connected to your PC. All EDS-508s connected to the LAN recommended to set the same management VLAN ID Management VLAN ID Settings Set the management VLAN of this EDS-508. Trunk Port Attach two VLAN Switches - carry Tag frames only Trunk Port connects another 802.1Q VLAN aware switch/hub Exchange GVRP messages between switches Trunk Port Trunk Port VID 1 VID 1 VLAN 1 VID 2 VLAN 2 VID 2 VID 1 VLAN 1 VID 2 VLAN 2 Trunk Port Settings Designate this port as Trunk port Set the VLAN IDs that will not be supported by this trunk port. Will be only valid for Trunk port Hybrid Port Hybrid Port Hybrid Port VID 1 Untagged Untagged Tagged Tagged device device device device Hybrid Port connects LAN that combines tagged and/or untagged devices and/or other switches All untagged devices are with the same PVID Keep the original VID of tagged device Hybrid port Settings Designate this port as Trunk port Set the other VLAN ID for tagged devices that connect to the Trunk port. Will be only valid for Trunk port Which ports should be set as Trunk Port Connect to another 802.1Q VLAN aware switch Connect to tagged devices and designate a Fixed VLAN (Tagged) for it. Redundant Port, Coupling Port, and Coupling Control Port. Main Path Coupling Control Port Backup Path Coupler EDS-308/305 Tagged Device Tagged Device VLAN Table . You can review the created VLAN groups, Joined Access Ports, and Trunk Ports VLAN Summary VLANs provide flexible network planning to make it easier to manage networks without physically changing cables or rearranging hardware.

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