The Brocade VCS Fabric Ethernet fabric is defined as a group of switches that exchange information between each other to implement distributed intelligence. The Brocade Ethernet fabric uses Transparent Interconnection of Lots of Links (TRILL) protocol, designed for the sole purpose of scaling Ethernet networks by allowing a set of devices, called routing bridges (RBridges), to connect with each other.
A link state dynamic routing protocol, rather than Spanning Tree Protocol, determines how the traffic is forwarded between the inter-connected RBridges. Link state routing in Brocade VCS Fabric-based TRILL networks is performed using Fabric Shortest Path First (FSPF) protocol.
TRILL enables Layer 2 networks to behave like routed Layer 3/IP networks. TRILL also defines native support for forwarding both unicast and multicast traffic, and therefore unifies support for both of these different classes of applications over a single transport.