Reference Cases

Project scenario

Link load balancing

Project overview

The campus network has two Internet outlets: Education Network 1G and telecom 1G. By installing a firewall card on the core switch 6509, two firewalls are virtualized to connect each outlet. The exit route planning of the whole campus network is: the default route takes the telecommunication link, and the static route specifies that the traffic accessing the education network resources takes the education network link. Since the routing entries to the education network are manually added and modified by the management personnel, the cost of managing and maintaining the routing table is very high. Moreover, in this static mode, once a link fails, the routing will not be automatically switched, causing some or all of the services of the intranet users to be interrupted. Because the routing table is manually added by human judgment, the accuracy of the routing table is not high, These conditions have caused a serious imbalance in the bandwidth distribution at the exit of the campus network of Hubei University. The export load of the telecommunication link is about 90%, while the link of the education network is only about 10%. In addition, when the telecommunication link fails, the whole university will be disconnected, and the advantages of multi link bandwidth sharing and mutual backup are not fully brought into play. The user's Internet experience is poor.

User requirement

• Make full use of link resources
• Sharing link load effectively
• Redundancy protection of each link
• Improve user experience on the Internet

Solution

Two SuperAD-8030 devices are deployed on the export link to solve the problems of policy routing, traffic load balancing, NAT and high availability. The two outgoing links are respectively connected to two load balancing devices, and then two lines are connected from the  load balancing devices to the core switches of the intranet to form VRRP mode. The two SuperAD-8030 devices are interconnected into HA structure through heartbeat lines and set to active standby mode. The load balancing equipment provides session mirror and real-time session synchronization and configuration synchronization, so that the user connection information will not be lost when the handover occurs, and the switching time is less than 1 second, and the main standby switching does not affect the user's Internet access.
At the same time, the SuperAD-8030 has built-in ISP address library, which can realize the routing of address library, so as to ensure the access of ISP resources from which link, and ensure the accuracy of routing and the user's access experience.

Implementation effect

After deploying SuperAD-8030 for load balancing of the two export links, the load conditions of the two export links of Hubei University are: the bandwidth of the telecom export link occupies 60%, and the bandwidth of the education network export link occupies 40%, which effectively reduces the load of the telecom export link and shares it with the education network link. Moreover, link overload protection is adopted between the two links. When the load of a certain link reaches the threshold value, It can automatically distribute the follow-up traffic to the other two links with low load. When one link breaks down, it can quickly distribute the traffic to other good links. It realizes the dynamic allocation of resources, redundant protection and intelligent routing of each link at the exit, simplifies the management process, reduces the failure rate, improves the network speed, ensures the online time, and improves the online experience of campus network users as a whole.

Why choose us

• The comprehensive cost performance ratio is high. One device has the functions of link load balancing / server load balancing and global server load balancing. Other functions are free.
• Provides DNS transparent proxy, link overload protection and other functions to ensure that the bandwidth of each link is evenly distributed and improve the utilization rate of each bandwidth.