A network hasn’t enough host addresses. At present, the LAN should be a class C network where
254 hosts can be configured. However, when there are more than 254 hosts in the LAN, another
class C network address is necessary since one class C network is not enough. Therefore, the
device should be connected to two networks and multiple IP addresses should be configured.
Many older networks are layer 2-based bridge networks that have not been divided into different
subnets. Use of secondary IP addresses will make it very easy to upgrade this network to an IP
layer-based routing network. The equipment configures an IP address for each subnet.
Two subnets of a network are separated by another network. You can create a subnet for the
separated network, and connect the separated subnet by configuring a secondary IP address. One
subnet cannot appear on two or more interfaces of a device.
Slave IP address is applied to the gateway cluster scenario. Only after the primary IP address is
configured can the slave IP address be configured. Both slave and primary addresses are
configured on an Layer 3 interface, backing up each other. In general, the master device adopts the
primary IP address and the slave device uses the slave IP address. When the slave device
becomes the master, its IP address becomes the primary IP address. When the master device
turns into a slave, its IP address becomes the salve IP address,
The following example configures the primary IP address and the network mask as 10.10.10.1 and
255.255.255.0 respectively .
Ruijie(config-if)# ip address 10.10.10.1 255.255.255.0
The following example configures the master and slave IP addresses as 10.10.10.1/24 and
10.10.20.1/24 respectively.
Ruijie(config)# interface gigabitEthernet 0/1
Ruijie(config-if-GigabitEthernet 0/1)# ip address 10.10.10.1 255.255.255.0
Ruijie(config-if-GigabitEthernet 0/1)# ip address 10.10.20.1 255.255.255.0
slave
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