Example: Manually specifying an IP address

As shown in Figure 11, a port in VLAN 1 on a switch is connected to a LAN comprising two segments: 172.16.1.0/24 and 172.16.2.0/24.

To enable the hosts on the two network segments to communicate with the external network through the switch, and to enable the hosts on the LAN to communicate with each other:

• Assign a primary IP address and a secondary IP address to VLAN-interface 1 on the switch.

• Set the primary IP address of the switch as the gateway address of the PCs on subnet 172.16.1.0/24, and set the secondary IP address of the switch as the gateway address of the PCs on subnet 172.16.2.0/24.

	IMPORTANT: By default, interfaces on the device are disabled (in ADM or Administratively Down state). To have an interface operate, you must use the undo shutdown command to enable that interface.

# Assign a primary IP address and a secondary IP address to VLAN-interface 1.

<Switch> system-view
[Switch] interface vlan-interface 1
[Switch-Vlan-interface1] ip address 172.16.1.1 255.255.255.0
[Switch-Vlan-interface1] ip address 172.16.2.1 255.255.255.0 sub

# Set the gateway address to 172.16.1.1 on the PCs attached to subnet 172.16.1.0/24, and to 172.16.2.1 on the PCs attached to subnet 172.16.2.0/24.

# Verify the connectivity between a host on subnet 172.16.1.0/24 and the switch.

<Switch> ping 172.16.1.2
Ping 172.16.1.2 (172.16.1.2): 56 data bytes, press CTRL_C to break
56 bytes from 172.16.1.2: icmp_seq=0 ttl=128 time=7.000 ms
56 bytes from 172.16.1.2: icmp_seq=1 ttl=128 time=2.000 ms
56 bytes from 172.16.1.2: icmp_seq=2 ttl=128 time=1.000 ms
56 bytes from 172.16.1.2: icmp_seq=3 ttl=128 time=1.000 ms
56 bytes from 172.16.1.2: icmp_seq=4 ttl=128 time=2.000 ms
--- Ping statistics for 172.16.1.2 ---
5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss
round-trip min/avg/max/std-dev = 1.000/2.600/7.000/2.245 ms

# Verify the connectivity between a host on subnet 172.16.2.0/24 and the switch.

<Switch> ping 172.16.2.2
Ping 172.16.2.2 (172.16.2.2): 56 data bytes, press CTRL_C to break
56 bytes from 172.16.2.2: icmp_seq=0 ttl=128 time=2.000 ms
56 bytes from 172.16.2.2: icmp_seq=1 ttl=128 time=7.000 ms
56 bytes from 172.16.2.2: icmp_seq=2 ttl=128 time=1.000 ms
56 bytes from 172.16.2.2: icmp_seq=3 ttl=128 time=2.000 ms
56 bytes from 172.16.2.2: icmp_seq=4 ttl=128 time=1.000 ms
--- Ping statistics for 172.16.2.2 ---
5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss
round-trip min/avg/max/std-dev = 1.000/2.600/7.000/2.245 ms

# Verify the connectivity between a host on subnet 172.16.1.0/24 and a host on subnet 172.16.2.0/24. The ping operation succeeds.