Shortest Path Bridging
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Shortest Path Bridging (SPB) is an 802.1aq IEEE (Institute of Electrical and Electronic Engineers) standard whose important focus was to highlight and address the challenges of Spanning-tree. But SPB can do much more than STPs emerge: SPB also provides MPLS-like VPN (Virtual Private Network) services but is very significantly simpler to deploy and maintain also.

Dissimilar to MPLS (Multiprotocol Label Switching), which requires a “bundle” of conventions (for instance MP-BGP, LDP, OSPF, among others), SPB deals with a solitary convention to give this usefulness: IS-IS (Intermediate System to Intermediate System). IS-IS will be the only one of the control plane conventions expected to construct a multi-way geography, perform highlights like location learning and convey VPN routes across the backbone.

Scalable, fast-converging, multi-path fabric

Shortest Path Bridging
Figure 2: Problems with STP (Spanning Tree Protocol)
Shortest Path Bridging
Figure 3: How SPB resolves the problem of STP

SPB loop-free topology is made by a link-state routing protocol Dijkstra’s Shortest Path First (SPF) algorithm: IS-IS. With IS-IS, no venture interface is closed, each of the routes is accessible and traffic/information between any sets of nodes follows the briefest way. Likewise, with MAC-in-MAC encapsulation, backbone nodes get familiar with no end-gadget MAC addresses or actual addresses, subsequently expanding the network’s versatility and solidness. With IS and MAC-in-MAC encapsulation, SPB makes various dynamic ideal paths for both connected and routed traffic.


SPB locally upholds multi-tenancy: The actual network is partitioned into different virtual parts alluded to as VPNs, and communities. Clients or Web over Things gadget gatherings, separated into various VPNs are secluded like VRFs and do not slow down each other. Between VPN correspondence, if necessary, is constrained by firewall arrangements. This multi-tenure element makes SPB reasonable for use cases like transportation, advanced education, and server farms. SPB’s versatility is not restricted to 4096 inhabitants since it is a 24-digit field which separates up to or 16M administrations.

Edge Administration Provisioning

Whether statically launched or progressively started up, SPB administrations need just be provisioned or designed on edge nodes just not on Core nodes. Core nodes are actually isolated from administration Moves, Adding, eliminating, or changing and require no touch while these exercises are performed.

Non-IP Core

In any event, while giving layer 3 administrations to IP (Internet Protocol) packets, SPB core nodes do not course/send traffic, they span/switch it. Truth be told, SPB core nodes do not have IP addresses and the IS-IS control convention, in contrast to BGP (Border Gateway Protocol) and OSPF, does not run on top of IP. This makes the network core innately safer and shields it from IP-based attacks, for example, IP parodying, examining and DOS and more. Unlike, SPB nodes still need an IP address for the purpose of management, but the management IP port is Isolated.

Shortest Path Bridging Benefits

Easy network

Dynamically build the network topology between the nodes and maintain the topology.

Efficient Operations

Use all the available physical connections by making more bandwidth available and sharing the load.

Time Saving

Adding and removing virtual machines using software configuration.

Cloud-based Network

Transform data center networks into private clouds very easily.

Reduce the Potential for Human mistakes.

Automatic configuration to prevent human errors.

So, Shortest Path Bridging(SPB) is the best and most powerful technology and is simple when compared to others such as MPLS or EVPN.

Zindagi Technology is an IT Consultant Company in Delhi. We have completed a lot of projects in the Public as well as in Private sectors. Zindagi Technologies consultants have expertise in the field of designing, building, and maintaining large-scale Networks. If you require any support, Please Contact us, drop us a message at +91-9773973971, or contact us via email. Follow us on LinkedIn and stay connected with the latest technology blogs.

Abhishek Kaushik

Associate Consultant

Comment (1)

  1. Ajay
    October 28, 2023

    The switches in the diagram seem to be like Alcatel switches as they have 6900 mentioned on them.

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