H3C Technologies H3C S12500-X Series Switches - Manual (Page 249)

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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.
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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 feature on the switch, the routing table size might decrease by half on the
LPUs as follows:
{
IPv4 and IPv6 routes decrease by half on the following LPUs:
− EA cards.
− EB cards.
− EC cards in the normal mode.
{
IPv6 routes decrease by half on EC cards that are in the extended routing mode.
For information about the operating mode of an LPU, see Fundamentals Configuration Guide.
• If the number of routes exceeds half the routing table size of the switch, the uRPF feature cannot be
enabled. This mechanism avoids loss of routes and packets.
To enable uRPF globally:
Step Command Remarks
1. Enter system view. system-view N/A