Planet XGS3-24042 User Manual download pdf (Page 206)

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22.3 IP Forwarding

22.3.1 Introduction to IP Forwarding

Gateway devices can forward IP packets from one subnet to another; such forwarding uses routes to find a

path. IP forwarding of switch is done with the participation of hardware, and can achieve wire speed

forwarding. In addition, flexible management is provided to adjust and monitor forwarding. Switch supports

aggregation algorithm enabling/disabling optimization to adjust generation of network route entry in the switch

chip and view statistics for IP forwarding and hardware forwarding chip status.

22.3.2 IP Route Aggregation Configuration Task

IP route aggregation configuration task:

1. Set whether IP route aggregation algorithm with/without optimization should be used

Command

Explanation

Global Mode

ip fib optimize

no ip fib optimize

Enables the switch to use optimized IP

route aggregation algorithm; the “no ip fib

optimize” disables the optimized IP route

aggregation algorithm.

22.4 URPF

22.4.1 Introduction to URPF

URPF (Unicast Reverse Path Forwarding) introduces the RPF technology applied in multicast to unicast, so

to protect the network from the attacks which is based on source address cheat.

When switch receives the packet, it will search the route in the route table using the source address as the

destination address which is acquired from the packet. If the found router exit interface does not match the

entrance interface acquired from this packet, the switch will consider this packet a fake packet and discard it.

In Source Address Spoofing attacks, attackers will construct a series of messages with fake source addresses.

For applications based on IP address verification, such attacks may allow unauthorized users to access the

system as some authorized ones, or even the administrator. Even if the response messages can’t reach the

attackers, they will also damage the targets.

Router A

Router B

Router C

1.1.1.8/8

2.2.2.1/8

ource IP：2.2.2.1/8

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Planet XGS3-24042 User Manual Page 206

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