3 – Planning
Performance
59042-00 A 3-7
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 Table3-1.
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 Table3-2.
Table 3-1. 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 port1
1Bandwidth will be less for larger sequence si zes.
2 Gbps 2 Gbps 200 MB
Table 3-2. Port-to-Port Latency
Source/Destination Rates Same Switch
1 Gbps - 1 Gbps < 1 µsec
2 Gbps - 2 Gbps < 0.5 µsec