433
Network application
Figure 135 Network diagram
, strict uRPF check is configured between an ISP network and a customer
network. Loose uRPF check is configured between ISPs.
Configuring uRPF
When you configure uRPF, follow these restrictions and guidelines:
•
Global uRPF configuration takes effect on both IPv4 and IPv6 routes.
•
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 Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enable uRPF globally.
ip urpf
{
loose
|
strict
}
By default, uRPF is disabled.
Displaying and maintaining uRPF
Execute
display
commands in any view.
ISP A
uRPF (loose)
uRPF (strict)
ISP C
ISP B
User
