H3C Technologies H3C SecPath F1000-E - Manual (Page 873)

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• Cluster: A cluster that provides network traffic load balancing, consisting of an LB device and
physical links
• LB device: A device that distributes traffic to multiple physical links.
• Physical links: Links provided by carriers.
• VSIP: Virtual service IP address provided by the cluster, that is, the destination segment of the
packets sent by users.
Figure 9 shows the work flow of outbound link load balancing.
Figure 9 Work flow of outbound link load balancing
The following describes the work flow of outbound link load balancing:
1. The LB device receives the traffic from the intranet users.
2. 8The LB device selects a link according to the destination IP address and the outbound link load
balancing rules configured.
3. 8The LB device forwards the traffic to the selected link.
4. The LB device receives the traffic sent from the extranet users.
5. The LB device forwards the traffic to the intranet users.
Inbound link load balancing
Figure 10 Inbound link load balancing network diagram
Server
Local DNS
server A
Local DNS
server B
LB device
Cluster
ISP1
ISP3
ISP2 IP network
Router A
Router B
Router C