Fabric Attach

The Fabric Attach feature allows attachment of non-SPB (Shortest Path Bridging) stations to an SPB network through a Fabric Attach server.

Fabric Attach uses the IEEE802.1ab Link Layer Discovery Protocol (LLDP) extensions to automatically attach network devices to individual services in a IEEE 802.1aq Shortest Path Bridging (SPB) network. These network devices typically do not support SPB, MAC-in-MAC (802.1ah) or Network Services Identifier (NSI)/Individual Service Identifier (ISID) usage, and therefore cannot easily take advantage of the Fabric infrastructure without manual configuration of VLAN attachments to NSIs or ISIDs in multiple locations. Fabric Attach deals with this issue by facilitating automated network device discovery and the automatic configuration and teardown of NSI/ISID to VLAN associations at the edge of the network.

Fabric Attach supports the following:
  • Single LAG between any two devices
  • Fabric Attach client and proxy behavior
  • Connection to a single Fabric Attach server
  • One-to-one mapping between a VLAN and an NSI or ISID
  • Stacking
  • RADIUS authentication

Supported Platforms

Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X440-G2, X870, X620, X690 series switches.


Mappings of VLANs to NSIs/ISIDs is limited to 94. See Limits.

Fabric Attach does not support the following:

  • MIBs
  • MLAGs
  • Fabric Attach TLV authentication
  • Fabric Attach standalone proxy
  • Fabric Attach server

New CLI Commands

configure [{vlan} vlan_name |vlan vlan_id] add [nsi nsi | isid isid]

configure [{vlan} vlan_name |vlan vlan_id] delete [nsi nsi | isid isid]

show [{vlan} vlan_name | vlan {vlan_id}] fabric attach mappings

show fabric attach neighbors

Changed CLI Commands

The following command is changed to show Fabric Attach mapping information:

show tech-support {all | area} {detail} {logto [file]}