R0106-HP MSR Router Series Layer 3 - IP Services Configuration Guide(V7)

178
Configuration example
Network requirements
As shown in Figure 69, the default gateway of the host is the IP address 1.1.1.2/24 of the interface
GigabitEthernet 2/1/1 of Router A. Configure a static route destined for the host on Router B. Router B
can receive directed broadcasts from the host to IP address 2.2.2.255.
Figure 69 Network diagram
Configuration procedure
1. Configure Router A:
# Specify IP addresses for GigabitEthernet 2/1/1 and GigabitEthernet 2/1/2.
<RouterA> system-view
[RouterA] interface gigabitethernet 2/1/1
[RouterA-GigabitEthernet2/1/1] ip address 1.1.1.2 24
[RouterA-GigabitEthernet2/1/1] quit
[RouterA] interface gigabitethernet 2/1/2
[RouterA-GigabitEthernet2/1/2] ip address 2.2.2.2 24
# Enable GigabitEthernet 2/1/2 to forward directed broadcasts destined for the directly
connected network.
[RouterA-GigabitEthernet2/1/2] ip forward-broadcast
2. Configure Router B:
# Configure a static route to the host.
<RouterB> system-view
[RouterB] ip route-static 1.1.1.1 24 2.2.2.2
# Specify an IP address for GigabitEthernet 2/1/2.
[RouterB] interface gigabitethernet 2/1/2
[RouterB-GigabitEthernet2/1/2] ip address 2.2.2.1 24
# Enable GigabitEthernet 2/1/2 to receive directed broadcasts destined for the directly
connected network.
[RouterB-GigabitEthernet2/1/2] ip forward-broadcast
After the configurations, if you ping the subnet-directed broadcast address 2.2.2.255 on the host, the
interface GigabitEthernet 2/1/2 of Router B can receive the ping packets. If you remove the ip
forward-broadcast configuration on any router, the interface GigabitEthernet 2/1/2 of Router B cannot
receive the ping packets.
Configuring MTU for an interface
When a packet exceeds the MTU of the output interface, the device processes it in one of the following
ways:
• If the packet disallows fragmentation, the device discards it.
• If the packet allows fragmentation, the device fragments it and forwards the fragments.