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Outbound Link Load Balance

This example shows how to configure outbound link load balancing. Through the configuration of efficient drainage strategy to achieve dynamic link load balancing, improve the export bandwidth utilization.

As shown in the following figure, this lab environment simulates the deployment of equipment at the second-level ISP exit scene.The second-level ISP rent Tele-com, China Netcom and other operators of the bandwidth to the user to achieve Internet access. The figure use 101.0.0.1 to connect to the Internet by Tele-com and 201.1.1.1 to connect to Netcom.

Configuration Steps

Step 1: Configure multiple equal-cost routes

1.Select Network > Routing >Destination Route, and click New.

  • Destination:0.0.0.0
  • Subnet Mask:0
  • Next Hop:interface
  • Interface:ethernet0/1
  • Gateway:101.1.1.1

2.Select Network > Routing >Destination Route, and click Newto configure another equal-cost route.

  • Destination:0.0.0.0
  • Subnet Mask:0
  • Next Hop:interface
  • Interface:ethernet0/2
  • Gateway:201.1.1.1
Step 2: Configure the outbound interface bandwidth

Network > Interface, select interface ethernet0 / 1, and click Edit to configure the bandwidth as 50M (according to the actual situation to determine the value of the configuration bandwidth).

  • Bandwidth
    • Up Bandwidth:50000000bps
    • Down Bandwidth:50000000bps

Follow the same steps to set the bandwidth of the interface ethernet0 / 2 to 50M.

Step 3: Configure the outbound load balancr profile

Select Network > Outbound >Profile, click New.

  • Profile:HP_LLB
  • Bandwidth Utillzation : 60%
  • Balance Mode:High Performance
Step 4: Configure the outbound load balancr rule

Select Network > Outbound >Rule, click New.

  • Rule Name:HP_LLB_rule
  • LLB Profile:Select the Profile "HP_LLB"
  • Bind Route:Destination Route

  • Vitual Router:trust-vr
  • Destination Address:0.0.0.0/0

 

Step 5: Verify that outbound load balance is in effect

After completing the above steps, use the test tool to construct traffic through ethernet0/1 and ethernet0/2, respectively, and then observe the traffic on each link.By changing the size of outgoing traffic,you can find that the traffic on two links can be adjusted equitably. The system routing mechanism is as follows:

  • When the bandwidth of each link does not exceed 30M (50M*60%), the system calculates the link overhead based on the link delay, jitter and packet loss rate. The link with the lower link overhead eventually allocates more traffic, while the other link has less traffic,but the two links are basically balanced.
  • When the link bandwidth exceeds 30M, the system adds the bandwidth utilization factor to the calculation, that is, the system calculates the link overhead based on the delay, jitter, packet loss rate and bandwidth utilization. The link with lower link overhead eventually allocates more traffic, while the other link has less traffic, but the two links are basically balanced.

Q&A

  • Q: What factors in the network affect the link load balancing routing of the system?
    A: The delay, jitter, packet loss rate and bandwidth utilization of each link are the impact factors. System can intelligently oute and dynamically adjust the traffic load of each link by monitoring the delay, jitter, packet loss rate and bandwidth utilization of each link in real-time.
  • Q: Which modes do link load balancing support?
    A: Two load balancing modes are supported, namely, high performance and high compatibility modes.
    • High Performance - In this mode, system adjusts link to keep the link balance as fast as possible

    • High Compatibility - In this mode, When the link load changes, system does not switch the link frequently, but ensures that the service is as far as possible on the previous link. This mode is suitable for services that are sensitive to link switching, such as banking services, only when the previous link is overloaded.