R211x-HP Flexfabric 11900 Security Configuration Guide

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Network application
Figure 77 Network diagram
Configure strict uRPF check between an ISP network and a customer network, and loose uRPF check
between ISPs.
Configuring uRPF
When you configure uRPF, follow these restrictions and guidelines:
• Global uRPF configuration takes effect on both IPv4 and IPv6 routes.
• After you enable the uRPF function on the switch, the routing table size might decrease by half on
the following MPUs and LPUs.
Table 11 MPUs and LPUs
MPU model LPU model
Half reduction of routing
table size occurs on…
LSU1SUPB9
(JG609A)
SF LPU (with the last two letters of the LPU model being
SF, such as LSU1TGS32SF9 (JG611A) )
MPU and SF LPU.
• If the number of routes exceeds half the routing table size of the switch, the uRPF function cannot be
enabled. This mechanism avoids loss of routes and packets.
To enable uRPF globally: