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32-2
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 32 Configuring Fibre Channel Routing Services and Protocols
About FSPF
About FSPF
FSPF is the protocol currently standardized by the T11 committee for routing in Fibre Channel networks.
The FSPF protocol has the following characteristics and features:
• Supports multipath routing.
• Bases path status on a link state protocol.
• Routes hop by hop, based only on the domain ID.
• Runs only on E ports or TE ports and provides a loop free topology.
• Runs on a per VSAN basis. Connectivity in a given VSAN in a fabric is guaranteed only for the
switches configured in that VSAN.
• Uses a topology database to keep track of the state of the links on all switches in the fabric and
associates a cost with each link.
• Guarantees a fast reconvergence time in case of a topology change. Uses the standard Dijkstra's
algorithm, but there is a static dynamic option for a more robust, efficient, and incremental Dijkstra's
algorithm. The reconvergence time is fast and efficient as the route computation is done on a per
VSAN basis.
FSPF Examples
This section provides examples of topologies and applications that demonstrate the benefits of FSPF.
Note The FSPF feature can be used on any topology.
Fault Tolerant Fabric
Figure 32-1 depicts a fault tolerant fabric using a partial mesh topology. If a link goes down anywhere in the
fabric, any switch can still communicate with all others in the fabric. In the same way, if any switch goes
down, the connectivity of the rest of the fabric is preserved.
Figure 32-1 Fault Tolerant Fabric
For example, if all links are of equal speed, the FSPF calculates two equal paths from A to C: A-D-C
(green) and A-E-C (blue).
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