Chapter 31. Using LLDP to debug network configuration problems

Procedure

1. Create the ~/enable-LLDP-enp1s0.yml file with the following content:

   interfaces:
     - name: enp1s0
       type: ethernet
       lldp:
         enabled: true

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2. Use the ~/enable-LLDP-enp1s0.yml file to enable LLDP on interface enp1s0:

   # nmstatectl apply ~/enable-LLDP-enp1s0.yml

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3. Display the LLDP information:

   # nmstatectl show enp1s0
   - name: enp1s0
     type: ethernet
     state: up
     ipv4:
       enabled: false
       dhcp: false
     ipv6:
       enabled: false
       autoconf: false
       dhcp: false
     lldp:
       enabled: true
       neighbors:
       - - type: 5
           system-name: Summit300-48
         - type: 6
           system-description: Summit300-48 - Version 7.4e.1 (Build 5)
             05/27/05 04:53:11
         - type: 7
           system-capabilities:
           - MAC Bridge component
           - Router
         - type: 1
           _description: MAC address
           chassis-id: 00:01:30:F9:AD:A0
           chassis-id-type: 4
         - type: 2
           _description: Interface name
           port-id: 1/1
           port-id-type: 5
         - type: 127
           ieee-802-1-vlans:
           - name: v2-0488-03-0505
             vid: 488
           oui: 00:80:c2
           subtype: 3
         - type: 127
           ieee-802-3-mac-phy-conf:
             autoneg: true
             operational-mau-type: 16
             pmd-autoneg-cap: 27648
           oui: 00:12:0f
           subtype: 1
         - type: 127
           ieee-802-1-ppvids:
           - 0
           oui: 00:80:c2
           subtype: 2
         - type: 8
           management-addresses:
           - address: 00:01:30:F9:AD:A0
             address-subtype: MAC
             interface-number: 1001
             interface-number-subtype: 2
         - type: 127
           ieee-802-3-max-frame-size: 1522
           oui: 00:12:0f
           subtype: 4
     mac-address: 82:75:BE:6F:8C:7A
     mtu: 1500

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4. Verify the output to ensure that the settings match your expected configuration. For example, the LLDP information of the interface connected to the switch shows that the switch port this host is connected to uses VLAN ID 448:

   - type: 127
           ieee-802-1-vlans:
           - name: v2-0488-03-0505
             vid: 488

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   If the network configuration of the enp1s0 interface uses a different VLAN ID, change it accordingly.