Link Layer Discovery Protocol (LLDP) Snooping
BTI7800 transport interfaces configured for Ethernet (10ge and 100ge) can be provisioned to snoop Link Layer Discovery Protocol (LLDP) frames to gather information about attached equipment. This information can then be accessed via the CLI or NETCONF and used to identify neighbor devices.
 | Note: LLDP snooping is supported starting with release 4.1. |
Figure 1: LLDP Snooping
LLDP data units, which are sent inside Ethernet frames at fixed intervals and identified by their destination Media Access Control (MAC) address and EtherType, carry device information in mandatory and optional type–length values (TLVs). Mandatory TLVs include device information such as chassis and port identification and system capabilities.
Configuring LLDP Snooping on an Ethernet Interface
Use this procedure to enable or disable LLDP snooping on an Ethernet interface (10ge or 100ge).
| Note: LLDP snooping is supported in the receive direction only and is disabled by default. |
- Enter configuration mode.
bti7800# configbti7800(config)#
- Configure LLDP snooping on an Ethernet interface.
For example, to enable LLDP snooping:
bti7800(config)# interface 10ge:1/2/1/1/1 lldp-snoop enablebti7800(config-interface-10ge:1/2/1/1/1)# commit Commit complete.
To disable LLDP snooping:
bti7800(config)# interface 10ge:1/2/1/1/1 lldp-snoop disablebti7800(config-interface-10ge:1/2/1/1/1)# commit Commit complete.
- Repeat the previous step for each Ethernet interface for which you want to configure LLDP snooping.
- Use the following show commands to either
confirm the configuration changes or retrieve LLDP data.
- show interface lldp table to retrieve a listing of all interfaces on which LLDP snooping is enabled.
- show interface lldp name:identifier to retrieve LLDP neighbor data for an LLDP-enabled interface.
- show interface name:identifier to view the value ( enabled or disabled ) of the LLDP snooping parameter for the specified interface.
Supported LLDP TLVs
BTI7800 only supports mandatory LLDP TLVs (Table 1), which provide information about a network-attached device (neighbor) for an LLDP-enabled Ethernet interface.
Table 1: Mandatory LLDP TLVs
TLV | Description | Range |
|---|---|---|
Time to Live | The amount of time (in seconds) that received LLDP data units will be retained | 0 to 65,535 |
Chassis ID Type | Chassis identifier type |
|
Chassis ID | Chassis identifier as per chassis identifier type | String (1 to 255 characters) |
Port ID Type | Port identifier type |
|
Port ID | Port identifier as per port identifier type | String (1 to 255 characters) |
Port Description | Port description (text) | String (0 to 255 characters) |
System Name | Administratively assigned system name | String (0 to 255 characters) |
System Description | System description (text) | String (0 to 255 characters) |
System Capabilities Supported | Supported system capabilities | List containing any of the following:
|
System Capabilities Enabled | Enabled system capabilities | |
Management Address Type | Management address identifier type |
|
Management Address | Management address as per identifier type | String (0 to 255 characters) |
Management Interface Subtype | Management interface number subtype |
|
Management Interface Number | Interface number that identifies the specific interface associated with the management address | 32-bit integer |
Management Interface OID | Object identifier (OID) that identifies the entity associated with the management address | String (OID format) |
