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5–Fibre Channel over IP
Configuring FCIP
ISR651101-00 J 5-17
When a configuration requires that the bandwidth available to the FCIP route be a
percentage of the total WAN bandwidth, it is important to correctly calculate the
bandwidth and set it accordingly. For instance if the FCIP route is being allocated
50 percent of an OC-3 link (150Mbps link), the route bandwidth setting should be
as follows:
Bandwidth Allocated = 50% × Link Rate
75Mbps = 0.5 × 150Mbps
For more information, see “Configuring an FCIP Route Using the CLI” on
page 5-4.
TCP Window Settings
The TCP window size defines the amount of data sent before seeing an
acknowledgement. It is used to avoid overwhelming the receiver and still maintain
a constant flow of data. The TCP window size is typically calculated based on the
RTT and WAN speed.
The following tables show the suggested TCP window size settings for IP links
based on link speed and RTT.
Table 5-4. T1 / DS-1—1.554Mbps
Round-Trip Time
(ms)
Window Size
(bytes)
Scaling Factor
(2
n
)
250 64K 1
100 32K 0
50 32K 0
25 32K 0
20 32K 0
15 32K 0
10 32K 0
5 32K 0
2.5 32K 0
1 or less 32K 0