Editing IS-IS (section)

== Other uses ==
IS-IS is also used as the control plane for [[Institute of Electrical and Electronics Engineers|IEEE]] 802.1aq Shortest Path Bridging (SPB).  SPB allows for shortest-path forwarding in an Ethernet mesh network context utilizing multiple equal cost paths.  This permits SPB to support large Layer 2 topologies, with fast convergence, and improved use of the mesh topology.{{Ref RFC|6329}}  Combined with this is single point provisioning for logical connectivity membership.  IS-IS is therefore augmented with a small number of TLVs and sub-TLVs, and supports two Ethernet encapsulating data paths, [[IEEE 802.1ad|802.1ad]] Provider Bridges and [[IEEE 802.1ah-2008|802.1ah]] Provider Backbone Bridges.  SPB requires no state machine or other substantive changes to IS-IS, and simply requires a new Network Layer Protocol Identifier (NLPID) and set of TLVs.  This extension to IS-IS is defined in the [[Internet Engineering Task Force|IETF]] proposed standard RFC 6329.