Cabletron Systems 802.1Q Configuration Process, 1 Deﬁning a Vlan, Classifying Frames to a Vlan

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Chapter 2: VLAN Operation

2.3CONFIGURATION PROCESS

Before a VLAN can operate, steps must be performed to conﬁgure the switch to establish and conﬁgure a VLAN. Cabletron Systems VLAN aware SmartSwitches default to operate in the 802.1Q VLAN mode.

However, further conﬁguration is necessary to establish multiple logical networks.

NOTE

The actual steps involved in VLAN conﬁguration using Local Management are presented in Chapter 3, VLAN Conﬁguration.This brief section describes the actions that must be taken in very general terms, and is intended only to aid in the Administrator’s understanding of VLAN switch operation.

2.3.1Deﬁning a VLAN

A VLAN must exist and have a unique identity before any ports or rules can be assigned to it. The Administrator deﬁnes a VLAN by assigning it a unique identiﬁcation number (the VLAN ID), a ﬁlter database association, and an optional name. The VLAN ID is the number that will identify data frames originating from, and intended for, the ports that will belong to this new VLAN.

2.3.2Classifying Frames to a VLAN

Now that a VLAN has been created, rules are deﬁned to classify all frames in a VLAN. This is accomplished through management by associating a VLAN ID with each port on the switch. Optionally, frames can be classiﬁed according to a protocol identiﬁer contained within the frame. The order of frame classiﬁcation priority is by VLAN Tag, a protocol match, and lastly the PVID. This combination of the switch port’s identiﬁcation and the VLAN ID becomes the Port VLAN ID (PVID).

At the same time, the Administrator conﬁgures the trunk ports that need to consider themselves members of every VLAN. The conﬁguration of trunk ports is very important in multiswitch VLAN conﬁgurations where a frame’s VLAN membership needs to be maintained across several switches.

2-2	802.1Q VLAN User’s Guide

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Contents 802.1Q Vlan User’s Guide Page 802.1Q Vlan User’s Guide 802.1Q Vlan User’s Guide Contents Contents Contents Contents 802.1Q Vlan User’s Guide Figures Tables Using this Guide Structure of this GuideRelated Documents Document ConventionsChapter Virtual Local Area Networks Defining VLANsBuilding One Building Two SecureFast VLANs Types of VLANs1 802.1Q VLANs Other Vlan StrategiesBenefits and Restrictions Vlan TermsData frame that does not have a Tag Header 1D Trunk Getting Help Your email address802.1Q Vlan User’s Guide Description Vlan Components1 Deﬁning a Vlan Configuration ProcessClassifying Frames to a Vlan Vlan Switch Operation Customizing the Vlan Forwarding ListInside the Switch Receiving Frames from Vlan PortsBroadcasts, Multicasts, and Unknown Unicasts Forwarding DecisionsKnown Unicasts Garp Switch Operation Managing the Switch Switch Without VLANsSwitch with VLANs Switch Management with VLANsManaging the Switch Summary of Vlan Local Management Preparing for Vlan Conﬁguration802.1Q Vlan Configuration Menu Screen When to UseHow to Access Menu Deﬁnitions Device Vlan Configuration Screen Device Vlan Conﬁguration ScreenField Deﬁnitions 1 Deﬁning a Vlan Changing the Vlan to FID Association Renaming a VlanEnabling VLANs Deleting a VlanDisabling VLANs Changing the Forwarding Mode Paging Through the Vlan ListPort Assignment Configuration Screen Port Assignment Conﬁguration ScreenChanging the Port Mode Port ModeAssigning a Vlan ID Port Filtering Configuration Screen Paging Through the Port ListPort Filtering Conﬁguration Screen Displaying Vlan IDs Associated with a Port Vlan ListsSelecting the Type of Filtering for a Port Vlan Forwarding Configuration Screen Vlan Forwarding Conﬁguration ScreenViewing Current Vlan Ports Frame FormatAdding Forwarding List Entries Paging Through Vlan Forwarding List EntriesDeleting Forwarding List Entries Protocol Vlan Configuration Screen Changing the Frame FormatProtocol Vlan Conﬁguration Screen Selectable Feature Status Assigning a Protocol Family to a Vlan ID Ether typeProtocol Vlan Conﬁguration Screen Displaying the Protocol Types on Current Ports Protocol Ports Configuration Screen 10 Protocol Ports Conﬁguration ScreenDelete ALL Adding/Deleting Ports Associated with a Vlan ID Quick Vlan Walkthrough802.1Q Vlan User’s Guide Hybrid 12 Walkthrough Stage Two 13 Walkthrough Stage Three 14 Walkthrough Stage Four Quick Vlan Walkthrough 15 Final Walkthrough Stage Example 1, Single Switch Operation Chapter ExamplesSolving the Problem Switch Conﬁgured for VLANsFrame Handling Example 2, Vlans Across Multiple Switches Example 2, VLANs Across Multiple Switches Switch Example 2, VLANs Across Multiple Switches Bridge 1 Broadcasts Frames Transmitting to Switch Example 3, 1D Trunk Connection to 802.1Q Vlan Network Transmitting to BridgeExample 3, 1D Trunk Connection to 802.1Q Vlan Network Solving the Problem Frame Handling 226318 Switch 2 Forwards to 1Q Trunk Examples Example 4, Isolating Network Traffic According to Protocol 11 Example 4, Isolating Trafﬁc According to Protocol Switch Examples Example 4, Isolating Network Trafﬁc According to Protocol Examples 802.1Q Vlan User’s Guide Index NumericsIndex-2 802.1Q Vlan User’s Guide 802.1Q Vlan User’s Guide Index-3 Index Index-4 802.1Q Vlan User’s Guide