Main Menu
  • COMPANY
    • Boundless Cybersecurity
    • Press Releases
    • News
    • Events
    • Awards
    • Leadership
    • Press Kit
    • Careers
  • PROMOTIONS
    • SonicWall Promotions
    • Customer Loyalty Program
  • MANAGED SERVICES
    • Managed Security Services
    • Security as a Service
    • Professional Services
SonicWall
  • Products
      All Products A–Z
      Free Trials
    • Network Security
      • Next-Generation Firewall (NGFW)
      • Network Security Services
      • Network Security Management
      • Secure SD-WAN
    • Threat Protection
      • Advanced Threat Protection Cloud
      • Advanced Threat Protection Appliance
      • Capture Labs
    • Secure Access Service Edge (SASE)
      • Zero-Trust Network Access (ZTNA)
    • Cloud Security
      • Cloud Firewall
      • Cloud App Security
    • Endpoint Security
      • Endpoint Detection & Response (EDR)
    • Email Security
      • Cloud Email Security
      • Hosted Email Security
      • On-Prem Email Security
    • Secure Access
      • Wireless Access Points
      • Network Switch
      • Virtual Private Network (VPN)
    • Wi-Fi 6 Access Points

      SonicWall SonicWave 600 series access points provide always-on, always-secure connectivity for complex, multi-device environments.

      Read More
  • Solutions
    • Industries
      • Distributed Enterprises
      • Retail & Hospitality
      • K-12 Education
      • Higher Education
      • State & Local
      • Federal
      • Healthcare
      • Financial Services
      • Carriers
    • Use Cases
      • Secure SD-Branch
      • Network Segmentation
      • Zero Trust Security
      • Secure SD-WAN
      • Office 365 Security
      • SaaS Security
      • Secure Wi-Fi
    • Solutions Widgets
      • Solutions Content Widgets
        Federal

        Protect Federal Agencies and Networks with scalable, purpose-built cybersecurity solutions

      • Solutions Image Widgets
  • Partners
    • SonicWall Partners
      • Partners Overview
      • Find a Partner
      • Authorized Distributors
      • Technology Partners
    • Partner Resources
      • Become a Partner
      • SonicWall University
      • Training & Certification
    • Partner Widgets
      • Custom HTML : Partners Content WIdgets
        Partner Portal

        Access to deal registration, MDF, sales and marketing tools, training and more

      • Partners Image Widgets
  • Support
    • Support
      • Support Portal
      • Knowledge Base
      • Technical Documentation
      • Community
      • Video Tutorials
      • Product Life Cycle Tables
      • Partner Enabled Services
      • Contact Support
    • Resources
      • Resource Center
      • Events
      • Free Trials
      • Blog
      • SonicWall University
      • MySonicWall
    • Capture Labs
      • Capture Labs
      • Security Center
      • Security News
      • PSIRT
      • Application Catalog
    • Support Widget
      • Custom HTML : Support Content WIdgets
        Support Portal

        Find answers to your questions by searching across our knowledge base, community, technical documentation and video tutorials

      • Support Image Widgets
  • COMPANY
    • Boundless Cybersecurity
    • Press Releases
    • News
    • Events
    • Awards
    • Leadership
    • Press Kit
    • Careers
  • PROMOTIONS
    • SonicWall Promotions
    • Customer Loyalty Program
  • MANAGED SERVICES
    • Managed Security Services
    • Security as a Service
    • Professional Services
  • Contact Sales
  • English English English en
  • BLOG
  • CONTACT SALES
  • FREE TRIALS
  • English English English en
SonicWall
  • Products
      All Products A–Z
      Free Trials
    • Network Security
      • Next-Generation Firewall (NGFW)
      • Network Security Services
      • Network Security Management
      • Secure SD-WAN
    • Threat Protection
      • Advanced Threat Protection Cloud
      • Advanced Threat Protection Appliance
      • Capture Labs
    • Secure Access Service Edge (SASE)
      • Zero-Trust Network Access (ZTNA)
    • Cloud Security
      • Cloud Firewall
      • Cloud App Security
    • Endpoint Security
      • Endpoint Detection & Response (EDR)
    • Email Security
      • Cloud Email Security
      • Hosted Email Security
      • On-Prem Email Security
    • Secure Access
      • Wireless Access Points
      • Network Switch
      • Virtual Private Network (VPN)
    • Wi-Fi 6 Access Points

      SonicWall SonicWave 600 series access points provide always-on, always-secure connectivity for complex, multi-device environments.

      Read More
  • Solutions
    • Industries
      • Distributed Enterprises
      • Retail & Hospitality
      • K-12 Education
      • Higher Education
      • State & Local
      • Federal
      • Healthcare
      • Financial Services
      • Carriers
    • Use Cases
      • Secure SD-Branch
      • Network Segmentation
      • Zero Trust Security
      • Secure SD-WAN
      • Office 365 Security
      • SaaS Security
      • Secure Wi-Fi
    • Solutions Widgets
      • Solutions Content Widgets
        Federal

        Protect Federal Agencies and Networks with scalable, purpose-built cybersecurity solutions

      • Solutions Image Widgets
  • Partners
    • SonicWall Partners
      • Partners Overview
      • Find a Partner
      • Authorized Distributors
      • Technology Partners
    • Partner Resources
      • Become a Partner
      • SonicWall University
      • Training & Certification
    • Partner Widgets
      • Custom HTML : Partners Content WIdgets
        Partner Portal

        Access to deal registration, MDF, sales and marketing tools, training and more

      • Partners Image Widgets
  • Support
    • Support
      • Support Portal
      • Knowledge Base
      • Technical Documentation
      • Community
      • Video Tutorials
      • Product Life Cycle Tables
      • Partner Enabled Services
      • Contact Support
    • Resources
      • Resource Center
      • Events
      • Free Trials
      • Blog
      • SonicWall University
      • MySonicWall
    • Capture Labs
      • Capture Labs
      • Security Center
      • Security News
      • PSIRT
      • Application Catalog
    • Support Widget
      • Custom HTML : Support Content WIdgets
        Support Portal

        Find answers to your questions by searching across our knowledge base, community, technical documentation and video tutorials

      • Support Image Widgets
  • COMPANY
    • Boundless Cybersecurity
    • Press Releases
    • News
    • Events
    • Awards
    • Leadership
    • Press Kit
    • Careers
  • PROMOTIONS
    • SonicWall Promotions
    • Customer Loyalty Program
  • MANAGED SERVICES
    • Managed Security Services
    • Security as a Service
    • Professional Services
  • Contact Sales
  • Menu

How to configure Layer 2 Discovery on Switching on 6.2 and above

03/20/2021 12 People found this article helpful 200,088 Views

    Download
    Print
    Share
    • LinkedIn
    • Twitter
    • Facebook
    • Email
    • Copy URL The link has been copied to clipboard

    Description

    This article provides information on how to configure Layer 2 Discovery on Switching on 6.2 and above.

    SonicOS provides Layer 2 (data link layer) switching functionality with its unique PortShield architecture. Layer 2 switching features enhance the deployment and interoperability of SonicWall devices within existing Layer-2 networks with the following benefits:

     

    Support for Layer 2 Discovery, also called L2 Discovery. Layer 2 Discovery uses theIEEE 802.1AB (LLDP) and Microsoft LLTD protocols and switch forwarding table to discover nodes visible from a port.

    Layer 2 Discovery is supported in Receive only mode. LLDP in transmit mode is not supported for security reasons. SonicWall does not send any response to a received LLDPDU.

     

    Layer 2 Discovery is only active for a short period of time when SonicWall boots up. Normally, Layer 2 Discovery is not active for security reasons. Layer 2 Discovery can be manually reactivated when needed.

     

    Support for Layer 2 Discovery does not cross a broadcast domain.

     

    The following diagram illustrates an example of Layer 2 Discovery. L2 discovery can discover many devices such as PC, Servers, switches, routers etc.

    Image

    Resolution

    Step 1. View the Layer 2 Discovery page

    Login to the SonicWall UTM appliance and configure Layer 2 Discovery from the Switching | L2 Discovery page. To discover devices connected to an interface, they can only be discovered if they are running LLDP or LLTD protocols.

    Image 

    Step 2. Discover devices connected to an interface.

     

    L2 Discovery does not proactively manage the discovery. Discovery is active when the system boots up and then does not restart unless you click the L2 Discovery refresh button in the SonicOS management interface.  To restart Layer 2 discovery on multiple interfaces, select the checkbox next to the desired interfaces and then click the Refresh Selected button at the bottom of the page or the round refresh button an each individual port.

     

    NOTE: Do not Port Mirror any ports when they participate in Layer 2 Discovery.

    Image   

    Step 3. Demonstrate the L2 Discovery of devices

    Show a Layer 2 Discovery example of a PC and a Switch connected to SonicWall. In this example two PCs are connected to port X1 and a HP Procurve switch to port X2.

    In this example port X1 discovers two PCs and port X2 discovers a HP Procure switch.

     Image

    Step 4. Show the configuration of the HP switch

    Show the LLDP default configuration from the HP ProCurve switch (example HP ProCurve 2920, 2600-8-PWR etc). The LLDP transmit interval is set for every 30 seconds. On the 6.2 system the L2 Discovery is a manual restart procedure, you may need to click the L2 Discovery refresh button multiple times to discover a neighbor device in the SonicOS management interface.

    Image 

    Show the LLDPDUs sent by the switch to the SonicWall. The SonicWall does not send any replies and therefore the switchs  NumFramesRecvd  counter is zero.

    Image 

    Related Articles

    • Bandwidth usage and tracking in SonicWall
    • How to force an update of the Security Services Signatures from the Firewall GUI
    • Configure Guest VLAN in the TZ firewall, for guest users to access Internet only.

    Categories

    • Firewalls > TZ Series
    • Firewalls > SonicWall SuperMassive E10000 Series
    • Firewalls > SonicWall SuperMassive 9000 Series
    • Firewalls > SonicWall NSA Series

    Not Finding Your Answers?

    ASK THE COMMUNITY

    Was This Article Helpful?

    YESNO

    Article Helpful Form

    Article Not Helpful Form

    Company
    • Careers
    • News
    • Leadership
    • Awards
    • Press Kit
    • Contact Us
    Popular resources
    • Communities
    • Blog
    • SonicWall Capture Labs

    Stay In Touch

    • By submitting this form, you agree to our Terms of Use and acknowledge our Privacy Statement. You can unsubscribe at any time from the Preference Center.
    • This field is for validation purposes and should be left unchanged.
    • Facebook
    • Twitter
    • Linkedin
    • Youtube
    • Instagram

    © 2023 SonicWall. All Rights Reserved.

    • Legal
    • Privacy
    • English
    Scroll to top