Operation Manual – Smart Link-Monitor LinkH3C S5600 Series Ethernet Switches Chapter 2 Monitor Link Configuration2-22.1.1 How Monitor Link WorksFigure 2-2 Network diagram for a monitor link group implementationAs shown in Figure 2-2, the devices Switch C and Switch D are connected to the uplinkdevice Switch E. Switch C is configured with a monitor link group, whereGigabitEthernet 1/0/1 is the uplink port, while GigabitEthernet 1/0/2 andGigabitEthernet 1/0/3 are the downlink ports. Switch A is configured with a smart linkgroup, where GigabitEthernet 1/0/1 is the master port and GigabitEthernet 1/0/2 is theslave port.z If Switch C is not configured with monitor link group, when the link for the uplinkport GigabitEthernet 1/0/1 on Switch C fails, the links in the smart link group arenot switched because the link for the master port GigabitEthernet 1/0/1 of Switch Aconfigured with smart link group operates normally. Actually, however, the trafficon Switch A cannot be up-linked to Switch E through the link of GigabitEthernet1/0/1.z If Switch C is configured with monitor link group and monitor link group detects thatthe link for the uplink port GigabitEthernet 1/0/1 fails, all the downlink ports in thegroup are shut down; therefore, GigabitEthernet 1/0/3 on Switch C is blocked.Now, smart link group configured on Switch A detects that a link fault occurs on themaster port GigabitEthernet 1/0/1. Then, Smart Link immediately activates theslave port GigabitEthernet 1/0/2 so that traffic is switched to the backup link.
