User's Manual

3 – Planning
Performance
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3.3.2
Bandwidth
Bandwidth is a measure of the volume of data that can be transmitted at a given
transmission rate. A port can transmit or receive at 1-Gbps or 2-Gbps depending
on the device to which it is connected. The switch supports all transmission rate
combinations as shown in Tab le 3-2.
In multiple chassis fabrics, each link between chassis contributes 100 or 200
megabytes of bandwidth between those chassis. 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.
3.3.3
Latency
Latency is a measure of how fast a frame travels 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.
Table 3-2. Port-to-Port Transmission Combinations
Source Port Rate Destination Port Rate Maximum Bandwdith
1-Gbps 1-Gbps 100 MB
1-Gbps 2-Gbps 100 MB
1-Gbps x 2 ports 2-Gbps 200 MB
2-Gbps 1-Gbps x 2 ports
100 MB each port
1
1
Bandwidth will be less for larger sequence sizes.
2-Gbps 2-Gbps 200 MB
Table 3-3. Port-to-Port Latency
Source/Destination Rates Same Switch I
1-Gbps – 1-Gbps < 1 µsec
2-Gbps – 2-Gbps < 0.4 µsec