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Digital Equipment MultiSwitch 700 User Manual

Port based vlan
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DIGITAL MultiSwitch 700
Port Based VLAN
User's Guide

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  • Page 1 DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide...

  • Page 3: Port Based Vlan

    DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide Part Number: 9032619 September 1998 This guide provides a general overview of the DIGITAL MultiSwitch 700 Port Based VLAN. Revision/Update Information: This is a new document.
  • Page 4 Cabletron Systems reserves the right to make changes in specifications and other information contained in this document without prior notice. The reader should in all cases consult Cabletron Systems to determine whether any such changes have been made. The hardware, firmware, or software described in this manual is subject to change without notice. IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FOR ANY INCIDENTAL, INDIRECT, SPECIAL, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING BUT NOT LIMITED TO LOST PROFITS) ARISING OUT OF OR RELATED TO THIS MANUAL OR...

  • Page 5: Table Of Contents

    Defining a VLAN ... 3-6 3.3.2 Renaming a VLAN ... 3-7 3.3.3 Deleting a VLAN ... 3-7 3.3.4 Enabling VLANs... 3-8 3.3.5 Disabling VLANs ... 3-8 3.3.6 Changing the VLAN Operation Mode ... 3-8 DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide Contents...
  • Page 6 Example 1 ...4-1 4.1.1 Solving the Problem ...4-2 4.1.2 Frame Handling...4-3 Example 2 ...4-4 4.2.1 Solving the Problem ...4-6 4.2.2 Frame Handling...4-7 Example 3 ...4-11 4.3.1 Solving the Problem ...4-13 4.3.2 Frame Handling...4-14 INDEX DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide...

  • Page 7: Structure Of This Guide

    Virtual Local Area Network (VLAN) technology and the VLAN Local Management screens used to configure the MultiSwitch 700 product used in port based VLAN environments. The term “port based VLAN” will be used throughout this document to refer to prestandard IEEE 802.1Q Virtual Local...

  • Page 8: Related Documentation

    Other DIGITAL documents that may be useful for understanding some of the concepts introduced or discussed in this guide are listed below: • The DIGITAL MultiSwitch 700 Overview and Setup Guide. • This manual can be obtained from the World Wide Web in Adobe Acrobat Portable Document Format (PDF) at the following site: http://www.networks.digital.com...

  • Page 9: Getting Help

    A description of your network environment (layout, cable type, etc.) • Network load and frame size at the time of trouble (if known) • The device history (i.e., have you returned the device before, is this a recurring problem, etc.) DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide Preface...

  • Page 11: Chapter 1 Virtual Local Area Networks

    Sales and Finance departments of a single company, and each building has its own internal network. The stations in each building connect to a MultiSwitch 700 in the basement. The two switches are connected to one another with a high speed link.
  • Page 12 In a port based VLAN environment, each MultiSwitch 700 understands that certain individual ports are members of separate workgroups. In this environment, a broadcast or multicast data transmission from one of the...

  • Page 13: Types Of Vlans

    VLAN the frame belongs to. If the frame has no tag header, the switch checks the VLAN setting of the port that received the frame. If the switch has been configured for port based VLAN support, it assigns the port’s VLAN identification to the new frame.

  • Page 14: Vlan Terms

    Tagged Frame A data frame that contains a Tag Header. The Tag Header can be added to the data frame by a VLAN aware switch to any frame received from a port that is a member of a VLAN. Untagged Frame A data frame that does not have a Tag Header inserted into it.
  • Page 15 1Q Trunk A connection between 802.1Q switches that passes only traffic with a VLAN Tag Header inserted in the frame. 1d Trunk A connection from a switch that passes only untagged traffic. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide...

  • Page 17: Chapter 2 Vlan Operation

    VLAN aware switches. It is the job of the switch to classify received frames into VLAN memberships and transmit frames, according to VLAN membership, with or without a VLAN Tag Header. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide 2-1 CHAPTER 2 VLAN OPERATION...

  • Page 18: Configuration Process

    Chapter 2: VLAN Operation CONFIGURATION PROCESS A VLAN requires a series of configuration steps in order to begin operating. Digital MultiSwitch 700 does not default to VLAN mode. The VLAN operation must be configured and activated through software management. The actual steps involved in VLAN configuration using Local Management are presented in Chapter 3, VLAN Configuration.This brief section describes the actions that...

  • Page 19: Customizing The Port's Egress List

    VLAN A. Interface 3 belongs to VLAN B. Interface 4 is a trunk port belonging to all VLANs. At intervals, frames come in to the switch through these interfaces and are examined. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide 2-3...

  • Page 20: Receiving Frames From Vlan Ports

    Administrator, the switch will classify frames received from that port as belonging to the Default VLAN (VLAN ID = 1) The switch will now make a forwarding decision on the frame based on its mode of operation, as described in Section 2.4.2, Forwarding Decisions.

  • Page 21: Forwarding Decisions

    MAC address of the frame. If such an interface is identified, the switch will then compare the VLAN tag of the frame with the VLAN eligibilities in that interface’s Egress List. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide 2-5 VLAN Switch Operation...
  • Page 22 MAC address and VLAN. Since no matches were found containing both the destination MAC address and the desired VLAN, the frame will be forwarded to all ports in the Forwarding List for VLAN A. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide...

  • Page 23: Chapter 3 Vlan Configuration

    VLAN CONFIGURATION This chapter describes the VLAN Local Management screens used to create and configure VLANs in a MultiSwitch 700. SUMMARY OF VLAN LOCAL MANAGEMENT The VLAN configuration process is an extension of normal Local Management operations. A series of Local Management screens provide access to the functions and commands necessary to add, change, or delete VLANs and to assign ports to those VLANs.

  • Page 24: Vlan Main Menu Screen

    The VLAN Local Management menu items listed on the VLAN Main Menu allow such VLANs to be configured on a network at the switched port of the device or MultiSwitch 700 chassis. Before attempting VLAN configuration, be certain the device to be so configured has been set for 802.1Q mode.
  • Page 25 The VLAN Forwarding Configuration screen enables the user to define or view which ports are included in the VLAN’s Forwarding List and whether to include a Tag Header in a frame being transmitted. Refer to Section 3.5 for additional information. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide...

  • Page 26: Device/Vlan Configuration Screen

    OPEN or SECURE. The Secure mode classifies frames as known if a MAC address and VLAN combination in the Filtering Database is found. Open mode classifies a frame as known if a MAC address match is located. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide...
  • Page 27 Name is an optional attribute of a VLAN, and is not required for VLAN operation. ADD/DEL (Toggle) Toggles the action taken between adding the named VLAN to the switch or deleting the named VLAN from the switch. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide...

  • Page 28: Defining A Vlan

    The VLAN will not be saved to the switch until the configuration is saved. 7. Use the arrow keys to highlight the SAVE command at the bottom of the screen. Press ENTER. The message “SAVED OK” displays. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide...

  • Page 29: Renaming A Vlan

    4. Use the arrow keys to highlight the SAVE command at the bottom of the screen. Press ENTER. The message “SAVED OK” displays. The default VLAN cannot be deleted from the list. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide Device/VLAN Configuration Screen...

  • Page 30: Enabling Vlans

    2. Press the SPACE bar or BACKSPACE to toggle between SECURE and OPEN. 3. Use the arrow keys to highlight the SAVE command at the bottom of the screen. 4. Press ENTER. The message “SAVED OK” displays. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide...

  • Page 31: Changing The Forwarding Mode

    Press ENTER to view the entries on the next screen. 2. To display the previous screen, use the arrow keys to highlight PREVIOUS. Press ENTER to view the entries on the previous screen. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide Device/VLAN Configuration Screen...

  • Page 32: Port Assignment Screen

    Lists the port numbers of the interfaces of the current module. Port Mode (Selectable) Displays the current operational mode for the corresponding port. 3-10 DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide MS 700 LOCAL MANAGEMENT Por t Assignment Mode...

  • Page 33: Changing The Port Mode

    VLAN out all ports. The forwarding list always has an untagged frame format for the entry that matches the PVID. A Hybrid port will receive and allow both tagged and untagged frames. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide Port Assignment Screen 3-11...

  • Page 34: Assigning A Vlan Id

    5. When the desired VLAN ID is displayed, use the arrow keys to highlight the SAVE command at the bottom of the screen. 6. Press ENTER. The message “SAVED OK” displays. 3-12 DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide...

  • Page 35: Paging Through The Port List

    Press ENTER to view the entries on the next screen. 2. To display the previous screen, use the arrow keys to highlight PREVIOUS. Press ENTER to view the entries on the previous screen. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide Port Assignment Screen 3-13...

  • Page 36: Vlan Forwarding Configuration Screen

    Lists the ports of the module that are members of the selected VLAN. Port Type (Read-Only) The MIB2 interface description for the selected switch port. 3-14 DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide MS 700 LOCAL MANAGEMENT VLAN Forwarding Configuration...

  • Page 37: Viewing Current Vlan Ports

    BACKSPACE to step to the desired VLAN ID and VLAN Name. 2. Press ENTER. The screen updates to display the Forwarding List for the selected VLAN. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide VLAN Forwarding Configuration Screen 3-15...

  • Page 38: Paging Through Vlan Forwarding List Entries

    The port is added to the Forwarding List for the selected VLAN. At the same time, the Egress List for the port so assigned is updated to contain the new VLAN and Frame Format. 3-16 DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide...

  • Page 39: Deleting Forwarding List Entries

    VLAN and assign a port to it. You may wish to follow this walkthrough from start to finish before attempting to configure your own VLANs. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide Quick VLAN Walkthrough 3-17...
  • Page 40 This new VLAN is currently disabled, as the DISABLED field to the far right shows. When all the rules and settings for the VLAN are in place, we will return to this screen and enable the VLAN. 3-18 DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide...
  • Page 41 PORT MODE from the default setting of HYBRID. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide MS 700 LOCAL MANAGEMENT D ev i c e / V L A N C o n f i g u r a t i o n...
  • Page 42 SPACE bar or BACKSPACE key to step sequentially through the possible settings of the port until 1Q TRUNK is displayed. 3-20 DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide MS 700 LOCAL MANAGEMENT Po r t A s s i g n m e n t...
  • Page 43 DEVICE/VLAN CONFIGURATION menu item. Press ENTER. The Device/VLAN Configuration screen, shown in Figure 3-9, displays. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide Quick VLAN Walkthrough MS 700 LOCAL MANAGEMENT Po r t A s s i g n m e n t...
  • Page 44 1Q Trunk port. 3-22 DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide MS 700 LOCAL MANAGEMENT D ev i c e / V L A N C o n f i g u r a t y i o n...

  • Page 45: Example 1

    This chapter provides examples of how VLAN aware MultiSwitch 700 can be configured to group users at the port level to create VLANs in existing networks. Each example presents a problem and shows how it is solved by configuring the switches using the VLAN Local Management screens.

  • Page 46: Solving The Problem

    4.1.1 Solving the Problem To set up this switch, users will be assigned to two new VLANs, red stations to the Red VLAN, and blue stations to the Blue VLAN. The information below describes how the switch is configured to create these two VLANs and how users are assigned to them.

  • Page 47: Frame Handling

    The frame is untagged, so the switch classifies it as belonging to the VLAN that Interface 1 is assigned to, the Red VLAN. 2. At the same time, the switch adds the source MAC address of the frame and VLAN it was learned from to its Source Address Table. In this fashion it learns that station R1 is located out Interface 1.
  • Page 48 Chapter 4: Examples 3. Once the frame is classified, its destination MAC address is examined. The switch discovers that the frame is a broadcast, and treats it as it would any other unknown destination MAC address. The switch forwards the frame out all ports in the Red VLAN’s Forwarding List.

  • Page 49: Example 2

    User A Floor 4 Floor 3 Blue Industries Floor 2 Floor 1 User 802.1d Legacy Bridge DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide Blue Industries Bridge 1 Red VLAN Redco Bridge 3 Blue VLAN 802.1Q VLAN-Aware Switch Figure 4-3 Example 2...

  • Page 50: Solving The Problem

    To solve the problem in this example, the users are assigned to VLANs using Switch 4 and Switch 2 as shown in Figure 4-3. Redco users are assigned to the Red VLAN and Blue Industries users to the Blue VLAN.

  • Page 51: Frame Handling

    The following describes how, when User A attempts to log on to the File Server on Bridge 4, the frames from User A are classified on Switch 4 and traverse the network. In this example, the MAC address of User A is “Y”...
  • Page 52 Switch 4 updates its Source Address Table if it didn’t already have a dynamic entry for MAC address “Y” and VLAN “Red”. Because Switch 4 received the frame on port 1 it does not forward the packet out that port, but does forward the frame to port 4.
  • Page 53 Floor 2 Figure 4-5 Transmitting to Switch 4 3. When Switch 2 receives the tagged frame on its port 2, it checks the frame’s VLAN Tag Header and determines that the frame is classified as belonging to the Red VLAN, and that the frame is a broadcast frame.
  • Page 54 802.Q switches update their databases based on the source MAC address, VLAN, and receive port. 5. The frame from the File Server is received on Switch 2, and forwarded to Switch 4 as a tagged frame classified as belonging to the Red VLAN.
  • Page 55 Green, Inc. A third group of stations, the Green, Inc. staff, is added to the facility. Also, the Green, Inc. Network Administrators add a Mail Server to the network on the first floor. DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide 4-11...
  • Page 56 VLAN for Green, Inc. users. All divisions in the facility are to have equal access to the Mail Server on the first floor. 4-12 DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide Bridge 1 Red VLAN Blue VLAN...

  • Page 57: Solving The Problem

    Switch 4 is set as follows: 1. The VLAN Operational Mode is set to OPEN using the Device/VLAN Configuration screen. 2. The Forward Mode for the switch is set to YES, adding the Default VLAN to the Egress List of every switch port. Switch 2 Switch 2 is set as follows: 1.
  • Page 58 Configuration screen. In this example is set as follows: • VLAN ID 224 with a VLAN Name of Green 4. A Port VLAN ID is assigned to the switch ports as follows using the Port Assignment screen: • Port 1, VLAN ID: 224 for the Green VLAN •...

  • Page 59: Vlan Tag

    Floor 4 Figure 4-8 Bridge 1 Broadcasts Frames 3. Switch 2 receives the tagged Red VLAN frame on port 2, as shown in Figure 4-9. The Tag in the frame is maintained, classifying the frame as belonging to the Red VLAN. The switch forwards the broadcast frame out all the eligible ports, ports 3 and 4.
  • Page 60 The switch recognizes User B’s MAC address in its Source Address Table and updates that table to contain the Mail Server’s MAC address and port combination. 4-16 DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide Mail Server Green VLAN 2263n20...
  • Page 61 Source Address Table to see if it can locate an entry for User B. User B is found to be located on port 1. The switch also updates its Source Address Table with the port and MAC address combination for the Mail Server.
  • Page 63 3-17 viewing 3-15 Forwarding mode changing 3-9 Frame format changing 3-17 Frames tagged 1-4, 2-5 untagged 1-4, 2-4 Hybrid 3-11 Lists Egress 1-5 Forwarding 1-5 Local Management 3-1 DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide Index Index 1...
  • Page 64 VLAN Main Menu 3-2 Station 2-1 Switch 2-1 Tag 1-4 Tag Header 1-4 Tagged frame 1-4, 2-5 Trunk 1-5 Untagged frame 1-4, 2-4 VLAN assigning ports 2-2 components 2-1 configuration 2-2 DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide Index Index 2...
  • Page 65 1-4 types 1-3 VLAN Configuration deleting 3-7 disabling 3-8 enabling 3-8 VLAN Forwarding Configuration screen 3-14 VLAN ID 1-4 assigning 3-12 VLAN Main Menu screen 3-2 VLAN name 1-4 DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide Index Index 3...
  • Page 68 9032619 Printed in U.S.A.

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