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TECHNICAL BRIEF

3Com

®

NJ205

IntelliJack

™

Switch
Management
Feature:

Virtual LANs
and Traffic
Prioritization

1
2
3
...
»

Содержание NJ205 - IntelliJack Switch

Страница 1: ...TECHNICAL BRIEF 3Com NJ205 IntelliJack Switch Management Feature Virtual LANs and Traffic Prioritization ...

Страница 2: ...ify outbound traffic to include VLAN tags Forward VLAN tagged traffic This supports other devices that rely on Ethernet frame tags to correctly recognize and forward VLAN traffic The section titled Setting the Ingress and Egress Modes provides step by step details on how to configure these capabilities Forwarding Traffic Among PAN Ports Port Associations regulate traffic between the PAN device por...

Страница 3: ...ng the Ingress and Egress Modes Although the NJ205 IntelliJack Switch does not use VLAN tags these tags are needed by many other network devices such as upstream switches or a VoIP phone connected to a PAN port To ensure traffic is appropriately tagged as it enters and exits the NJ205 switch can be configured to add tags remove tags or leave frames unmodified The ingress mode uses the receiving po...

Страница 4: ... Tag Set 802 1 VLAN Tag Set Egress rule set to add tag Ingress rule set to remove tag Do not modify tag information Forward frame to PAN port Forward frame to PAN port Add VLAN tag information Remove all tag information Do not modify tag information Do not modify tag information Do not modify tag information Figure 1 The ingress mode is applied to VLAN traffic coming from the LAN before it gets se...

Страница 5: ... entered and accepted the next window will show a summary of the new settings 6 Click OK to finalize and exit the configuration window Setting the PAN Port Associations The PAN device ports can support up to four different VLAN domains 3Com Central Configuration Manager lets you assign individual ports to four separate VLANs all ports to the same VLAN or any combination in between The following ex...

Страница 6: ...s for VLANs outgoing tags and incoming tags The 3Com Central Configuration Manager GUI enables point and click remote administration of NJ205 IntelliJack Switches 4 Under Port based VLANs make sure the Port Association box is checked 5 You should see four tabs one for each PAN port Select the Port 1 tab and check the Port 2 box This configures Ports 1 and 2 to share traffic with each other but not...

Страница 7: ...he pull down menu select Frames received are unmodified 7 Click OK to exit configuration window Figure 5 Setting the outgoing and incoming tag schemes assigns the PAN ports to one or more VLANs Setting Outgoing and Incoming Tag Schemes Once the Port Associations have been set up the PAN ports can be assigned to VLANs using the appropriate VLAN ID VID numbers The PAN port VIDs can be any number fro...

Страница 8: ... applications are used by accounting departments to handle AR AP taxes interest payments and other business critical processes These powerful programs need immediate and reliable access to large datasets and bulky spreadsheets CAD CAM design applications take up enormous amounts of network bandwidth for accessing server farms and transferring very large graphics files How Traffic Prioritization Wo...

Страница 9: ...or 1 0 2 or 3 2 4 or 5 4 6 or 7 6 Traffic Prioritization Configuration and Setup YES YES NO NO NO NO YES YES Inspect Ethernet frame Inspect Ethernet frame 802 1 Priority Tag Set 802 1 Priority Tag Set Egress rule set to add tag Ingress rule set to add tag Do not modify tag information Forward frame to PAN port Forward frame to PAN port Add priority tag information Remove all tag information Do not...

Страница 10: ...following settings a None b 802 1p Traffic Class fields c Use IP TOS Diffserv fields d Both To ignore the priority tags on incoming Ethernet frames set the Priority Look up Scheme to None Note Priority Lookup Scheme specifically instructs the NJ205 IntelliJack Switch to inspect Ethernet frames at the LAN port for 802 1p Diffserv or both If the incoming traffic will not be Diffserv or 802 1p the Pr...

Страница 11: ...y from the menu 3 Click on the Hardware Settings tab to view and configure the Priority Schedule Policy settings You should see a window like this 4 Under Priority Schedule Policy choose one of the following a 8 4 2 1 weighted fair queuing default b Strict Priority Scheme all queues weighted the same 5 When all configuration settings are complete click on the Apply button which opens a password pr...

Страница 12: ...lar a telephone conference with a trans Pacific client suffered in quality and usability The meeting ended up being postponed until the next day a 24 hour delay that cost the company many thousands of dollars This disaster might have been avoided if IT staff had installed 3Com NJ205 IntelliJack Switches in all offices and conference rooms as part of the infrastructure upgrade Using port based VLAN...

Страница 13: ...ermission Not allowed Port Setting Default Value State Forwarding Link Autonegotiation Flow Control Off MDI X Force MDI Multicast Limit 3 Priority Lookup Tag and IPV4 Port Priority 1 VLAN ID 1 Port based VLAN All ports on same VLAN Unchanged Values After Restoring to Factory Default Settings Some configuration values remain unchanged when you click Restore Factory Default Settings The following va...

Страница 14: ... accept liability for any errors or mistakes which may arise Specifications and other informa tion in this document may be subject to change without notice 104101 001 09 03 3Com NJ205 IntelliJack Switch is compliant with SNMPv 1 and supports most SNMP management platforms Multicast packets are handled the same as broadcast packets The autonegotiation setting on the LAN port uplink port cannot be c...

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