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1aq standard, is a computer networking technology intended to simplify the creation and configuration of networks, while enabling multipath routing. It is the replacement for the older spanning tree protocols: IEEE 802. The technology provides logical Ethernet networks on native Ethernet infrastructures using a link state protocol to advertise both topology and logical network membership. On 4 March 2006 the working group posted 802.

M and interoperability with current protocols. On March 2012 the IEEE approved the 802. In 2012, it was stated by David Allan and Nigel Bragg, in 802. 1aq Shortest Path Bridging Design and Evolution: The Architect’s Perspective that shortest path bridging is one of the most significant enhancements in Ethernet’s history. In May 2013, the first public multi-vendor interoperability was demonstrated as SPB served as the backbone for Interop 2013 in Las Vegas. Cor 2-2012, and IEEE Std 802.

RFC 6329 – IS-IS Extensions Supporting IEEE 802. 1aq, and are described in more detail below. Data Centre virtualisation” articulates the desire to flexibly and efficiently harness available compute resources in a way that may rapidly be modified to respond to varying application demands, without the need to dedicate physical resources to a specific application. The carrier-space equivalent of this application is the delivery of Ethernet VPN services to Enterprises over common carrier infrastructure. The multiple virtual LAN segment model provides this, and the single-touch provisioning model eases carrier operations. A further consequence of SPBM’s transparency in both dataplane and control plane is that it provides a perfect, “no compromise” delivery of the complete MEF 6. MPLS services which have this network structure internally.

SPBM offers both the ideal multicast replication model, where packets are replicated only at fork points in the shortest path tree that connects members, and also the less state intensive head end replication model where in essence serial unicast packets are sent to all other members along the same shortest path first tree. These two models are selected by specifying properties of the service at the edge which affect the transit node decisions on multicast state installation. Figure 5 below is a quick way to understand what SPBM is doing on the scale of the entire network. Figure 5 shows how a 7-member E-LAN is created from the edge membership information and the deterministic distributed calculation of per source, per service trees with transit replication. Head end replication is not shown as it is trivial and simply uses the existing unicast FIBs to forward copies serially to the known other receivers. Topology data is then input to a calculation engine which computes symmetric shortest path trees based on minimum cost from each participating node to all other participating nodes.

In SPB as with other link state based protocols, the computations are done in a distributed fashion. The two different flavors of data path give rise to two slightly different versions of this protocol. Chronologically SPBV came first, with the project originally being conceived to address scalability and convergence of MSTP. At the time the specification of Provider Backbone bridging was progressing and it became apparent that leveraging both the PBB data plane and a link state control plane would significantly extend Ethernet’s capabilities and applications. Shortest Path bridging enables shortest path trees for VLAN Bridges all IEEE 802. 1 data planes and SPB is the term used in general.

A primary feature of Shortest Path bridging is the ability to use Link State IS-IS to learn network topology. The IS-IS topology is leveraged both to allocate unique SPVIDs and to enable shortest path forwarding for individual and group addresses. SPBV builds shortest path trees that support Loop Prevention and optionally support loop mitigation on the SPVID. SPBV builds shortest path trees but also interworks with legacy bridges running Rapid Spanning Tree Protocol and Multiple Spanning Tree Protocol. SPBV uses techniques from MSTP Regions to interwork with non-SPT regions behaving logically as a large distributed bridge as viewed from outside the region. SPBV supports shortest path trees but SPBV also builds a spanning tree which is computed from the link state database and uses the Base VID. The CIST is the default tree used to interwork with other legacy bridges.

It also serves as a fall back spanning tree if there are configuration problems with SPBV. SPBV has been designed to manage a moderate number of bridges. SPBV differs from SPBM in that MAC addresses are learned on all bridges that lie on the shortest path and a shared VLAN learning is used since destination MACs may be associated with multiple SPVIDs. SPBV learns all MACs it forwards even outside the SPBV region. 1ah header and then traverse the IEEE 802.

1aq network unchanged until they are stripped of the encapsulation as they egress back to the non participating attached network at the far side of the participating network. LAN and are forwarded to the appropriate participating B-MAC address to reach the far end Ethernet destination. In this manner Ethernet MAC addresses are never looked up in the core of an IEEE 802. The forward and reverse paths used for unicast and multicast traffic in an IEEE 802. Group address and unknown destination individual frames are optimally transmitted to only members of the same Ethernet service.