Figure 1 shows the test environment.
Figure 1 Test environment
Four server blades (CNA141, CNA142, CNA143, and CNA144) are in Smart-Link. Two network ports (eth0 and eth1) of each server blade are connected to switch modules A1 and A2, and the two modules are connected using a stack cable. Table 1 describes the connections.
Table 1 Connections
The network is connected, and the Smart-Link switching function is enabled. After the Master (Trunk 0) link is interrupted, Trunk 1 is in active state, and Trunk 0 is in inactive state. In this case, networks over Trunk 1 are normal. After three seconds the Master link is restored, Trunk 0 is in active state, and Trunk 1 is in inactive state; however, the network cannot be pinged. Based on the default configuration for Smart-Link, the service interruption duration is three seconds during link switchover; however, service interruption lasts for three to four minutes after links are switched back.