McDATA ULTRANETTM EDGE STORAGE ROUTER 3000 - Manual (Page 63)

3
Network Design Criteria 3-9
Network Routing Options
Channel is sequenced separately. Therefore, link quality on a single
link will not affect the other while they are running.
This is the only selectable option for 1x1 configurations.
Dedicated Path for
1x1 Configurations
• UltraNet Edge 3000 Fibre Channel interface 2 uses UltraNet Edge
3000 WAN interface 3
Dedicated Path for
2x2 Configurations
• UltraNet Edge 3000 Fibre Channel interface 1 uses UltraNet Edge
3000 WAN interface 3
• UltraNet Edge 3000 Fibre Channel interface 2 uses UltraNet Edge
3000 WAN interface 4
Load Balancing If Load Balancing is selected, both links are used in tandem to nearly
double the effective throughput available to the active Fibre Channel
interfaces. Each Fibre Channel interface has sequencing through its
own virtual circuit. Load Balancing runs best when both WAN links
are of equal quality in terms of latency, bandwidth, and reliability.
Due to the sequencing of data frames on the virtual circuit, when one
of the links is running at significantly lower quality, the link running
at a higher quality will perform similar to the lower quality link.
When load balancing over two circuits, there should be no more than
25% difference in latency, bandwidth, and reliability between the two
circuits.
This option functions the same for both FC/IP and Fibre Channel
Switch interfaces. It is only selectable for 2x2 configurations.
Load Balancing Path
for 2x2 Configurations
• UltraNet Edge 3000 Fibre Channel interface 2 uses UltraNet Edge
3000 WAN interfaces 3 & 4
• UltraNet Edge 3000 Fibre Channel interface 1 uses UltraNet Edge
3000 WAN interfaces 3 & 4
Fail Over If Fail Over is selected for an FC/IP interface, each FC/IP interface is
configured with a primary WAN to route its traffic over. If the
primary WAN has an outage, the traffic is rerouted over the
secondary path.
If this option is selected for a Fibre Channel Switch interface, both
ports will use the same primary WAN for routing the traffic. The
other remaining WAN will serve as the secondary route if the
primary WAN has an outage.