Cisco DS-C9216I-K9, Руководство по настройке

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Cisco MDS 9000 Fabric Manager Switch Configuration Guide
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Chapter 21 Configuring Fibre Channel Routing Services and Protocols
FSPF Features
FSPF Features
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 re convergence 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.
The FSPF feature can be used on any topology.
Fault Tolerant Fabric
Figure 21-1 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 21-1 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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A B
D E
C