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1. Set whether IP route aggregation algorithm with/without optimization should be
used.
Command Explanation
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.
10.3.3 Command for IP Route Aggregation
10.3.3.1 ip fib optimize
Command:ip fib optimize
no ip fib optimize
Function:
Enables the switch to use optimized IP route aggregation algorithm; the “
no ip
fib optimize
” disables the optimized IP route aggregation algorithm.
Default:
Optimized IP route aggregation algorithm is disabled by default.
Command mode:
Global Mode
Usage Guide:
This command is used to optimize the aggregation algorithm: if the route
table contains no default route, the next hop most frequently referred to will be used to
construct a virtual default route to simplify the aggregation result. This method has the
benefit of more effectively simplifying the aggregation result. However, while adding a
virtual default route to the chip segment route table reduces CPU load, it may introduce
unnecessary data stream to switches of the next hop. In fact, part of local switch CPU
load is transferred to switches of the next hop.
Example:
Disabling optimized IP route aggregation algorithm.
Switch(Config)# no ip fib optimize
10.4 URPF
10.4.1 URPF Introduction
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
