Example: Configuring IRDP

Network configuration

As shown in Figure 55, Host A and Host B that run Linux support IRDP, and they are in the internal network. Switch A and Switch B act as the egress routers and connect to external networks 192.168.1.0/24 and 192.168.2.0/24, respectively.

Configure Switch A as the default gateway for the hosts. Packets to the external networks can be correctly routed.

Figure 55: Network diagram

Procedure

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.

Configure Switch A:
# Specify an IP address for VLAN-interface 2.
```
<SwitchA> system-view
[SwitchA] interface vlan-interface 2
[SwitchA-Vlan-interface2] ip address 10.154.5.1 24
```
# Enable IRDP on VLAN-interface 2.
```
[SwitchA-Vlan-interface2] ip irdp
```
# Specify preference 1000 for advertised IP addresses on VLAN-interface 2.
```
[SwitchA-Vlan-interface2] ip irdp preference 1000
```
# Specify the multicast address 224.0.0.1 as the destination IP address for RAs sent by VLAN-interface 2.
```
[SwitchA-Vlan-interface2] ip irdp multicast
```
# Specify the IP address 192.168.1.0 and preference 400 for VLAN-interface 2 to proxy-advertise.
```
[SwitchA-Vlan-interface2] ip irdp address 192.168.1.0 400
```
Configure Switch B:
# Specify an IP address for VLAN-interface 2.
```
<SwitchB> system-view
[SwitchB] interface vlan-interface 2
[SwitchB-Vlan-interface2] ip address 10.154.5.2 24
```
# Enable IRDP on VLAN-interface 2.
```
[SwitchB-Vlan-interface2] ip irdp
```
# Specify preference 500 for advertised IP addresses on VLAN-interface 2.
```
[SwitchB-Vlan-interface2] ip irdp preference 500
```
# Specify the multicast address 224.0.0.1 as the destination IP address for RAs sent by VLAN-interface 2.
```
[SwitchB-Vlan-interface2] ip irdp multicast
```
# Specify the IP address 192.168.2.0 and preference 400 for VLAN-interface 2 to proxy-advertise.
```
[SwitchB-Vlan-interface2] ip irdp address 192.168.2.0 400
```

Verifying the configuration

# Display the routing table for Host A.

[HostA@localhost ~]$ netstat -rne
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.154.5.0      0.0.0.0         255.255.255.0   U     0      0        0 eth1
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth1
192.168.2.0     0.0.0.0         255.255.255.0   U     0      0        0 eth1
0.0.0.0          10.154.5.1     0.0.0.0          UG    0      0        0 eth1

The output shows that the default route on Host A points to IP address 10.154.5.1, and Host A has routes to 192.168.1.0/24 and 192.168.2.0/24.

# Display the routing table for Host B.

[HostB@localhost ~]$ netstat -rne
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.154.5.0      0.0.0.0         255.255.255.0   U     0      0        0 eth1
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth1
192.168.2.0     0.0.0.0         255.255.255.0   U     0      0        0 eth1
0.0.0.0          10.154.5.1     0.0.0.0          UG    0      0        0 eth1

The output shows that the default route on Host B points to IP address 10.154.5.1, and Host B has routes to 192.168.1.0/24 and 192.168.2.0/24.

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