|
Feature |
Product |
Release introduced |
|---|---|---|
|
Fabric Attach Server |
5320 Series |
Fabric Engine 8.6 |
|
5420 Series |
VOSS 8.4 |
|
|
5520 Series |
VOSS 8.2.5 |
With Fabric Attach, network edge devices that do not support Shortest Path Bridging (SPB), MAC-in-MAC encapsulation (802.1ah) or service identifiers (I-SIDs) can take advantage of SPB infrastructure. To attach to an SPB network, edge devices signal an SPB-aware FA Server to automatically configure the I-SIDs. The edge devices can then utilize existing SPB features across the fabric and leverage SPB infrastructure capabilities without manual configuration. Fabric Attach uses the IEEE 802.1AB Logical Link Discovery Protocol (LLDP) to signal a desire to join the SPB network.
FA uses the client-server model. An initial handshake occurs between the FA Server and the FA Client. After the discovery phase is complete, the FA Server accepts requests (from FA Clients) to add the C-VID (VLAN ID) and I-SID elements in the SPB network, and also automatically configures the necessary C-VID and I-SID. The FA Server then responds with an acknowledgement of whether the request succeeded. FA Clients can also be aggregated into a proxy device that handles the handshakes and requests on behalf of many clients, to the server. All of the discovery handshakes and I-SID mapping requests are then transferred using LLDP Type, Length, Value (TLV) fields.
FA leverages LLDP to discover directly connected FA peers and to exchange information associated with FA between those peers. Based on the LLDP standard, FA information is transmitted using organizational TLVs within LLDP Protocol Data Units (PDU).