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.
|
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 |
|
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. |