Dell PowerConnect 6224 User Manual page 604

The Loopback ID field goes away, and the remaining loopback fields display.
Figure 9-56. Loopbacks Configuration - IPv4 Entry
5. Enter IPv4 in the Protocol field.
6. Enter desired values in the remaining fields.
7. Click Submit.
The new loopback is saved, and the webpage reappears showing secondary address configuration fields.
Figure 9-57. Loopback Configuration - Add Secondary Address
8. Complete the Secondary Address, Secondary IP Address, and Secondary Subnet Mask fields.
9. Click the Add Secondary button. The secondary address is saved, and the webpage reappears showing
the primary and secondary loopback addresses.
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Configuring Routing