Disabling RIP-2 Classful Summarization
On the network where subnets are incontiguous, you can cancel the classful summarization of RIP-2 so that more accurate routing information can be obtained.
Context
Summarizing IP addresses can reduce the routing table size, but it shields routing information of subnets. As a result, incorrect routing information may be calculated.
On a non-contiguous subnet, you need to disable RIP-2 classful summarization. On the network shown in Figure 1, you need to disable split horizon from interfaces of Router A and Router C.
By default, RIP-2 classful summarization is enabled. Therefore, Router B and Router C send a route destined for 10.0.0.0/8 to Router A. Router A cannot differentiate 10.1.0.0/16, 10.2.0.0/16, 10.4.0.0/16, or 10.5.0.0/16. As a result, incorrect routes are calculated.
Procedure
- Run system-view
The system view is displayed.
- Run rip [ process-id ]
A RIP process is created, and the RIP view is displayed.
- Run undo summary
RIP-2 classful summarization is disabled.
- Run commit
The configuration is committed.