441
Network application
Figure 135 Network diagram
As shown in Figure 135, strict uRPF check is configured between an ISP network and a customer
network. Loose uRPF check is configured between ISPs.
Enabling uRPF
When you enable 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:
1. Enter 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
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