Juniper IGP - CONFIGURATION GUIDE V11.1.X, Configuration Manual

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You can change a secondary address to be the primary address on an interface
only via SNMP.
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An unnumbered address is always the primary address; adding an unnumbered
address, therefore, overwrites any other numbered address.
Deleting a Primary Address
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You must always remove the primary address from an interface last.
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You cannot delete the primary address if the interface still has assigned secondary
addresses.
Adding a Secondary (Multinet) Address
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You cannot add a secondary address until you add the primary address.
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You cannot add a secondary address to bridged Ethernet interfaces.
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You cannot change a primary address to a secondary address.
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An interface can have multiple secondary addresses.
Deleting a Secondary Address
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You must delete secondary addresses before deleting the primary address.
ip address Command
Use the following command to add addresses to or delete addresses from an interface:
ip address
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Use to add a primary address or to add secondary addresses to an interface.
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To add multiple addresses to a single IP interface, use the secondary keyword.
(Remember, if you add an address using the ip address command and do not
include the secondary keyword, the new address becomes the primary address.)
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You can specify the subnetwork mask value in either dotted decimal or prefix
length notation.
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Example—Adds a primary address (192.168.2.77) and two secondary addresses
(172.31.7.22 and 10.8.7.22); the Fast Ethernet interface now has addresses in
three networks.
host1(config)# interface fastEthernet 0/0
host1(config-if)# ip address 192.168.2.77 255.255.255.0
host1(config-if)# ip address 172.31.7.22 255.255.255.0 secondary
host1(config-if)# ip address 10.8.7.22 255.255.255.0 secondary
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IP Addressing
JUNOSe 11.0.x IP, IPv6, and IGP Configuration Guide