Rip horizontal segmentation

Rip horizontal segmentation is a mechanism used by the distance vector routing protocol to reduce possible routing loops, the horizontal split function prevents the router information received or learned by an excuse from being sent back from this interface.

Use (NO) debug IP rip to view the RIP Protocol update details

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This figure is a simple description.

Assume that the R1 route table contains

1.1.1.0

13.1.1.0

12.1.1.0

In three direct connection networks, R3 sends its route table to R1 through the RIP Protocol:

3.3.3.0

13.1.1.0

23.1.1.3

When R1 obtains the R3 route table, it updates its route table, that is

1.1.1.0 0 hops

13.1.1.0 0 hops

12.1.1.0 0 hops

3.3.3.0 1 hop

23.1.1.0 1 hop

When R1 sends a route table to R3, it will not send 13.1.1.0, 3.3.3.0, 23.1.1.0

This is horizontal segmentation.

Use the show IP interface + interface to check whether the horizontal split function is enabled for the interface.

Apart from the frame-relay link, the horizontal split of RIP is enabled by default.

Enable IP split-horizon (this command is only required for Frame Relay Links) No IP split-horizon close

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Rip horizontal segmentation