Network Application; Configuring Urpf; Displaying And Maintaining Urpf - HP 5920 Series Configuration Manual

Network application

Figure 75 Network diagram
Configure strict uRPF check between an ISP network and a customer network, and loose uRPF check
between ISPs.

Configuring uRPF

Follow these guidelines when you configure uRPF:
uRPF checks only incoming packets on an interface.
•
• After you enable the URPF function on the switch, the routing table size might decrease by half.
If the number of routes exceeds half the routing table size of the switch, the URPF function cannot be
•
enabled to avoid loss of routes and packets.
To enable uRPF globally:
Step
1. Enter system view.
2. Enable uRPF globally.

Displaying and maintaining uRPF

Execute display commands in any view.
ISP A
ISP B
User
Command
system-view
ip urpf { loose | strict }
217
uRPF (loose)
ISP C
uRPF (strict)
Remarks
N/A
By default, uRPF is disabled.