Anthony Fajri

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Unicast Reverse Path Forwarding

uRPF is used to verify the reachability of the source address in packets being forwarded. If the source IP is not valid, the the packet will be discarded.

uRPF can work in 3 modes:

  • strict mode

    • in this mode, the packet must be received on the interface that the router would use to forward the return packet.
    this mode can be configured as following:

    interface FastEthernet 0/0
    ip verify unicast source reachable-via rx

  • loose mode

    • in this mode, the source address must appear in the routing table
    this mode can be configured as following:

    interface FastEthernet 0/0
    ip verify unicast source reachable-via any

  • vrf mode


    • Reference: Cisco

    March 8th, 2010 Posted by Anthony Fajri | ccie | no comments

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