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3 – Planning
Feature Licensing
59265-02 A 3-5
A
Latency
Latency is a measure of how fast a frame travels through a switch from one port to
another. The factors that affect latency include transmission rate and the
source/destination port relationship as shown in Table 3-3.
Feature Licensing
License keys provide a way to expand the capabilities of your switch and fabric as
your needs grow. Consider your need for the following features and arrange to
purchase license keys from your switch distributor or authorized reseller.
Enterprise Fabric Suite 2007 provides access to the Enterprise Fabric Suite
2007 application which is included on the product CD with a 30-day trial
license. Enterprise Fabric Suite 2007 is a graphical user interface designed
to provide comprehensive fabric management for fabrics of four or more
switches. This license enables you to install and use Enterprise Fabric Suite
2007 on an unlimited number of workstations.
Table 3-3. Port-to-Port Latency
Destination Rate
Source Rate
Gbps 2 4 8 10 20
2 < 0.6 µsec
< 0.7 µsec
1
1
Based on minimum frame size of 36 bytes. Latency increases for larger frame sizes.
< 0.6 µsec
1
< 0.6 µsec
1
< 0.6 µsec
1
4 < 0.4 µsec < 0.3 µsec
< 0.4 µsec
1
< 0.4 µsec
1
< 0.3 µsec
1
8 < 0.3 µsec < 0.2 µsec < 0.2 µsec
< 0.2 µsec
1
< 0.2 µsec
1
10 < 0.3 µsec < 0.3 µsec < 0.2 µsec < 0.2 µsec
< 0.2 µsec
1
20 < 0.3 µsec < 0.2 µsec < 0.2 µsec < 0.2 µsec < 0.2 µsec
NOTE:
License keys enable menu selections in Enterprise Fabric Suite 2007 and
commands and keywords in the CLI. License keys do not affect the
capabilities of the QuickTools web applet.