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3 – Planning
Performance
3-4 59265-00 A
S
In multiple chassis fabrics, each link between chassis contributes 424, 850, 1700,
2550, or 5100 megabytes of bandwidth between those chassis, depending on the
speed of the link. When additional bandwidth is needed between devices,
increase the number of links between the connecting switches. The switch
guarantees in-order delivery with any number of links between chassis.
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 3-2.
Table 3-2. 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