Configuring RIP-2 Route Summarization

RIP-2 route summarization can reduce the size of a routing table and improve network efficiency. By default, RIP-2 route summarization is enabled. To broadcast all subnet routes, you can disable RIP-2 route summarization.

Context

Route summarization indicates that multiple subnet routes on the same natural network segment are summarized into one route with the natural mask when being advertised to other network segments. Therefore, route summarization reduces the network traffic and the size of the routing table.

Route summarization is enabled for RIP-2 by default, but is invalid for RIP-1. To broadcast all subnet routes, you can disable RIP-2 automatic route summarization.

Route summarization is invalid when poison reverse is configured. When the summarized routes are sent outside the natural network boundary, poison reverse in related views needs to be disabled.

Procedure

Enable RIP-2 automatic route summarization.
1. Access the system view.
```
system-view
```
2. Configure a RIP process and access the RIP process view.
```
rip [ process-id ]
```
3. Configure RIP-2.
```
version 2
```
4. Enable route summarization.
```
summary [ always ]
```
  - Enable the RIP-2 automatic route summarization when split horizon is disabled, there is no need to configure always.
  - Enable the RIP-2 automatic route summarization irrespective of split horizon configuration, always must be configured.
  The summary command is used in the RIP view to enable classful network-based route summarization.
Configure RIP-2 to advertise the summary address.
1. Access the system view.
```
system-view
```
2. Access the interface view.
```
interface interface-type interface-number
```
3. Advertise the local summary address of RIP-2.
```
rip summary-address ip-address mask [ avoid-feedback ]
```
  The rip summary-address ip-address mask [ avoid-feedback ] command is run in the interface view to enable classless network-based route summarization.