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Chapter 31. Using LLDP to debug network configuration problems
You can use the Link Layer Discovery Protocol (LLDP) to debug network configuration problems in the topology. This means that, LLDP can report configuration inconsistencies with other hosts or routers and switches.
31.1. Debugging an incorrect VLAN configuration using LLDP information
If you configured a switch port to use a certain VLAN and a host does not receive these VLAN packets, you can use the Link Layer Discovery Protocol (LLDP) to debug the problem. Perform this procedure on the host that does not receive the packets.
Prerequisites
-
The
nmstatepackage is installed. - The switch supports LLDP.
- LLDP is enabled on neighbor devices.
Procedure
Create the
~/enable-LLDP-enp1s0.ymlfile with the following content:interfaces: - name: enp1s0 type: ethernet lldp: enabled: trueUse the
~/enable-LLDP-enp1s0.ymlfile to enable LLDP on interfaceenp1s0:# nmstatectl apply ~/enable-LLDP-enp1s0.ymlDisplay 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: 1500Verify 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: 488If the network configuration of the
enp1s0interface uses a different VLAN ID, change it accordingly.
Additional resources
