Fspf Examples - Cisco AJ732A - MDS 9134 Fabric Switch Configuration Manual

Information About FSPF
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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.
Note
Fault Tolerant Fabric Example
Figure 40-1
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 40-1
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).
Redundant Link Example
To improve on the topology in
replicated; two or more links can be present between a pair of switches.
arrangement. Because switches in the Cisco Nexus 5000 Series support port channels, each pair of
physical links can appear to the FSPF protocol as one single logical link.
By bundling pairs of physical links, FSPF efficiency is considerably improved by the reduced database
size and the frequency of link updates. Once physical links are aggregated, failures are not attached to a
single link but to the entire SAN port channel. This configuration also improves the resiliency of the
network. The failure of a link in a SAN port channel does not trigger a route change, which reduces the
risks of routing loops, traffic loss, or fabric downtime for route reconfiguration.
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
40-2
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
algorithm, but there is a static dynamic option for a more robust, efficient, and incremental Dijkstra
algorithm. The reconvergence time is fast and efficient as the route computation is done on a per
VSAN basis.
depicts a fault tolerant fabric using a partial mesh topology. If a link goes down anywhere
Fault Tolerant Fabric
A B
D
Chapter 40 Configuring Fibre Channel Routing Services and Protocols
C
E
Figure 40-1, each connection between any pair of switches can be
Figure 40-2 shows this
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