Preventing Network Congestion

On the network shown in Figure 1, AGG_Switch_A and AGG_Switch_B back up each other, and several ACC_Switches are dual-homed to the two AGG_Switches to implement load balancing. If some network-side links between AGG_Switch_A and the core network fail, the available bandwidth of links between them decreases accordingly. However, ACC_Switches cannot detect link failures and still forward packets destined for the core network to AGG_Switch_A. In this scenario, congestion will occur on the links between AGG_Switch_A and the core network.

To prevent network congestion, you can deploy route monitoring groups on ACC_Switches to quickly detect the connectivity of IP routes on the network. This will allow ACC_Switches to promptly perform access-side link switching when there are changes to the status of IP routes.

Figure 1 Typical networking diagram of route monitoring groups