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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 13

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Applications

Applications

This section describes the applicable scenario of URPF.

URPF Strict Check

As shown in Figure 12-56, AS1, AS2, and AS3 are unidirectionally connected. URPF is enabled on Interface1 and Interface2 of SwitchC to protect AS3 from source address spoofing attacks from AS1 and AS2.

Assumes that PC A in AS1 generates a packet with the bogus source IP address 2.2.2.2 and sends the packet to the server in AS3. After receiving the packet, SwitchC checks the inbound interface of the packet and finds that the packet with the destination IP address 2.2.2.2 must reach SwitchC through Interface2. SwitchC considers the packet as a bogus packet and discards it.

The packet sent from AS2 to the server is forwarded after passing URPF check.

Figure 12-56 URPF strict check application

URPF Loose Check

URPF is often used when multiples connections are set up between two network edge devices.

  • Single-homed client connected to one ISP

    Figure 12-57 URPF enabled on single-homed client connected to one ISP

    As shown in Figure 12-57, two connections are set up between the enterprise and the ISP device to ensure reliability. In this case, route symmetry between the enterprise and the ISP device cannot be ensured. Therefore, URPF loose check is used.

  • Multi-homed client connected to several ISPs

    Figure 12-58 URPF enabled on multi-homed client connected to several ISPs

    As shown in Figure 12-58, the enterprise is connected to several ISPs. Route symmetry between the enterprise and the two ISP devices cannot be ensured. Therefore, URPF loose check is used.

    URPF enabled on multi-homed client connected to several ISPs can be applied to the following situations:

    • If specified packets are required to pass the URPF check in any situations, you can create an ACL to permit packets with specified source IP addresses to pass through.

    • The devices connected to users may only have a default route to the ISP. Therefore, matching the default routing entry needs to be supported.

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Updated: 2019-12-13

Document ID: EDOC1000041694

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