ZyXEL Communications Prestige 480 - Manual (Page 84)

Prestige 480 Dual BRI ISDN Router
3-20 Internet Access
3.10 Configuring Backup ISP Accounts
If you have more than one ISP account, you can configure the secondary ISP as a backup. You can switch to
the backup ISP in the event that the primary ISP is out of service. The SUA feature can be enabled for all
these accounts.
3.10.1 Configure a Backup ISP
To configure a backup ISP Account, follow these steps:
Step 1. Configure your primary ISP using Menu 4, as described earlier in this chapter.
Step 2. Enter Menu 11, then select an unused remote node.
Step 3. In Menu 11.1, choose a name for your backup ISP account, then set the Active field to No, and
enter your outgoing login name, password, and phone number(s). The Remote IP Address field
should be set to 1.1.1.1.
Step 4. In Menu 11.3, set the remote node's subnet mask to 0.0.0.0, and set RIP to None.
Step 5. Save the new configuration.
Please note that the remote IP address of 1.1.1.1 is only a placeholder to avoid conflicting with that of the
primary ISP, which is implicitly set at 0.0.0.0. When the backup ISP is activated, the remote IP address of
1.1.1.1 combined with the subnet mask of 0.0.0.0 creates a default route that is equivalent to the one
derived form the primary ISP.
3.10.2 To Switch ISP
Follow these steps when you need to switch from your primary ISP to a backup ISP:
Step 1. Enter Menu 11 and select your Primary ISP.
Step 2. In Menu 11.1, set the Active field to No.
Step 3. Enter Menu 11 again and select your Backup ISP.
Step 4. In Menu 11.1, set the Active field to Yes.