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Handbook

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Configuring gateway links

The gateway link configuration enables you to specify health checks, bandwidth rate thresholds, and spillover threshold behavior for the gateway links you add to link groups.

Before you begin:

  • You must know the IP addresses of the ISP gateway links used in the network segment where the FortiADC appliance is deployed.
  • You must have added health check configuration objects that you want to use to check the gateway links.
  • You must have Read-Write permission for Link Load Balance settings.

After you have configured a gateway link configuration object, you can select it in the link group configuration.

To configure a gateway link:
  1. Go to Link Load Balance > Link Group.
  2. Click the Gateway tab.
  3. Click Create New to display the configuration editor.
  4. Complete the configuration as described in LLB gateway configuration.
  5. Save the configuration.

LLB gateway configuration

Settings Guidelines

Name

Configuration name. Valid characters are A-Z, a-z, 0-9, _, and -. No spaces. You reference this name in the link group configuration.

Note: After you initially save the configuration, you cannot edit the name.

Address

IP address of the gateway link.

Health Check

Enable health checks.

Health Check Relationship

  • AND—All of the selected health checks must pass for the link to the considered available.
  • OR—One of the selected health checks must pass for the link to be considered available.

Health Check List

Select one or more health check configuration objects.

Inbound Bandwidth

Maximum bandwidth rate for inbound traffic through this gateway link.

Outbound Bandwidth

Maximum bandwidth rate for outbound traffic to this gateway link. If traffic exceeds this threshold, the FortiADC system considers the gateway to be full and does not dispatch new connections to it.

The default is 2,000,000 Kbps. The valid range is 1 to 2,147,483,647.

We recommend you tune bandwidth thresholds strategically, using the bandwidth rate and price structure agreement you have with your ISP to your advantage.

Inbound Spillover Threshold

Maximum inbound bandwidth rate for a link in a spillover load balancing pool.

Outbound Spillover Threshold

Maximum outbound bandwidth rate for a link in a spillover load balancing pool.

If you enable spillover load balancing in the link group configuration, the system maintains a spillover list. It dispatches new connections to the link with the greatest priority until its spillover threshold is exceeded; then dispatches new connections to the link with the next greatest priority until its threshold is exceeded, and so on.

The default is 2,000,000 Kbps. The valid range is 1 to 2,147,483,647.

Total Spillover Threshold

Maximum total bandwidth rate (inbound plus outbound) for a link in a spillover load balancing pool.

Configuring gateway links

The gateway link configuration enables you to specify health checks, bandwidth rate thresholds, and spillover threshold behavior for the gateway links you add to link groups.

Before you begin:

  • You must know the IP addresses of the ISP gateway links used in the network segment where the FortiADC appliance is deployed.
  • You must have added health check configuration objects that you want to use to check the gateway links.
  • You must have Read-Write permission for Link Load Balance settings.

After you have configured a gateway link configuration object, you can select it in the link group configuration.

To configure a gateway link:
  1. Go to Link Load Balance > Link Group.
  2. Click the Gateway tab.
  3. Click Create New to display the configuration editor.
  4. Complete the configuration as described in LLB gateway configuration.
  5. Save the configuration.

LLB gateway configuration

Settings Guidelines

Name

Configuration name. Valid characters are A-Z, a-z, 0-9, _, and -. No spaces. You reference this name in the link group configuration.

Note: After you initially save the configuration, you cannot edit the name.

Address

IP address of the gateway link.

Health Check

Enable health checks.

Health Check Relationship

  • AND—All of the selected health checks must pass for the link to the considered available.
  • OR—One of the selected health checks must pass for the link to be considered available.

Health Check List

Select one or more health check configuration objects.

Inbound Bandwidth

Maximum bandwidth rate for inbound traffic through this gateway link.

Outbound Bandwidth

Maximum bandwidth rate for outbound traffic to this gateway link. If traffic exceeds this threshold, the FortiADC system considers the gateway to be full and does not dispatch new connections to it.

The default is 2,000,000 Kbps. The valid range is 1 to 2,147,483,647.

We recommend you tune bandwidth thresholds strategically, using the bandwidth rate and price structure agreement you have with your ISP to your advantage.

Inbound Spillover Threshold

Maximum inbound bandwidth rate for a link in a spillover load balancing pool.

Outbound Spillover Threshold

Maximum outbound bandwidth rate for a link in a spillover load balancing pool.

If you enable spillover load balancing in the link group configuration, the system maintains a spillover list. It dispatches new connections to the link with the greatest priority until its spillover threshold is exceeded; then dispatches new connections to the link with the next greatest priority until its threshold is exceeded, and so on.

The default is 2,000,000 Kbps. The valid range is 1 to 2,147,483,647.

Total Spillover Threshold

Maximum total bandwidth rate (inbound plus outbound) for a link in a spillover load balancing pool.