2-31
Installing the Switch
Sample Network Topologies
Installing the Switch
Figure 2-25. 10-GbE port architecture showing ports grouped by 14.4 Gbps channel.
When any two 10-GbE ports are in a linked state, each port automatically
operates on its own channel, which guarantees 10 Gbps of bandwidth for each
port. However, when more than two ports are in a linked state, ports A1 and
A4 are statically mapped to share one 14.4 Gbps channel, while ports A2 and
A3 are statically mapped to share the other 14.4 Gbps channel.
To summarize:
■ If only one port in a given channel is in a linked state, then that port
operates at wire speed and the other port uses no bandwidth.
■ If both ports in a given channel are in a linked state, then the 14.4 Gbps of
bandwidth is balanced fairly between the two ports.
For example, in an application where three ports are needed and it is impor-
tant to ensure that port 1 always has a full 10 Gbps available, the connection
choices shown in the next figure would be used.
1
10
-
GbE Module Ports
14.4 Gbps
Channel
4 2
14.4 Gbps
Channel
A1
(X2)
10-GbE Ports
14.4 Gbps
Channel
A4
(X2)
2
(CX4)
14.4 Gbps
Channel
(CX4)
Switch
