LLDP Fabric Connect TLV

The system uses the Link Layer Discovery Protocol (LLDP) Fabric Connect Type-Length-Value (TLV) to communicate B-VLANs and system IDs between nodes in the SPB cloud. For more information about LLDP and its interaction with Fabric Attach, see Link Layer Discovery Protocol (802.1AB) Fundamentals.

Table 1. LLDP Fabric Connect TLV Format

TLV Type

TLV Length

OUI

Subtype

Fabric Connect Capability

B-VLANs Number

B-VLAN-1

B-VLAN-2

System ID Length

System ID

7 bits

9 bits

3 octets

1 byte

1 byte

1 byte

2 bytes

2 bytes

1 byte

6 bytes

Table 2. LLDP Fabric Connect TLV Field Descriptions

TLV Field

Description

OUI

Specifies the Extreme OID value (0xd88466).

Fabric Connect capability

Fabric Connect capability is enabled on all nodes that support Zero Touch Fabric Configuration. The value is 0 if the LLDP Fabric Connect TLV is not carrying any information in it. By default, the value is set to 1 on all ports.

B-VLANs number

Specifies the number of B-VLANs that the TLV can carry. The LLDP Fabric Connect TLV supports an unlimited number of B-VLANs, but Zero Touch Fabric Configuration sends two B-VLANs through the TLV. The value is 0 if the node is sending default B-VLAN values.

B-VLANs

Specifies the B-VLAN that is user-configured or dynamically learned from a neighbor node in the network.

System ID Length

Specifies the length (in bytes) of the System ID.

System ID

Specifies the IS-IS system ID.