Ip Urpf - HP FlexFabric 7900 Series Command Reference Manual

ip urpf

Use ip urpf to enable uRPF.
Use undo ip urpf to disable uRPF.
Syntax
ip urpf { loose | strict }
undo ip urpf
Default
uRPF is disabled.
Views
System view
Predefined user roles
network-admin
Parameters
loose: Enables loose uRPF check. To pass loose uRPF check, the source address of a packet must match
the destination address of a FIB entry.
strict: Enables strict uRPF check. To pass strict uRPF check, the source address and receiving interface of
a packet must match the destination address and output interface of a FIB entry.
Usage guidelines
uRPF can be deployed on a PE connected to a CE or another ISP, or on a CE.
Configure strict uRPF check on a PE interface connected to a CE, and configure loose uRPF check on a
PE interface connected to another ISP.
For asymmetrical routing where the interface receiving upstream traffic is different from the interface
forwarding downstream traffic on a PE device, configure loose uRPF to avoid discarding valid packets.
If the two interfaces are the same (symmetrical routing), configure strict uRPF. An ISP usually adopts
symmetrical routing on a PE device.
Examples
# Enable strict uRPF check globally.
<Sysname> system-view
[Sysname]ip urpf strict
Related commands
display ip urpf
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