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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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A RIP Error Occurs due to Discontinuous Subnets

A RIP Error Occurs due to Discontinuous Subnets


Discontinuous Subnets, RIP, Error


A RIP error occurs due to discontinuous subnets.

Problem Description

Figure 14-17 Networking diagram

Switches A, B, and C run RIP. RIP is run in the network segments and of Switch A, network segments and of Switch B, and network segments and of Switch C.

Fault Symptom

A RIP error occurs due to discontinuous subnets.


Run the display ip routing-table command on Switch B to check whether the routing information is correct.

If the routing information of Switch B is correct, Switch B has a route to each of the network segments and

The command output, however, shows that Switch B has only one route to the network segment


The network configured with discontinuous subnets runs RIPv1, which does not support VLSM and CIDR. As a result, a RIP route error occurs. To solve the problem, configure RIPv2 on all the devices on the network and disable classful route summarization.

Run commands on Switch A:

<HUAWEI> system-view
[~HUAWEI] rip XX // Enter the RIP view
[~HUAWEI-rip-xx] version 2 // Configure RIPv2
[*HUAWEI-rip-xx] undo summary // Disable classful route summarization

After configuring Switch A, configure Switch B and Switch C. The configurations of Switch B and Switch C are similar to that of Switch A, and are not provided here.


RIPv1 does not support discontinuous subnets. When discontinuous subnets are deployed on a network, configure RIPv2 on the network.

When a network runs RIPv2, classful route summarization is enabled by default. To ensure the correctness of the routing information, disable classful route summarization.

Updated: 2020-01-07

Document ID: EDOC1000060766

Views: 608651

Downloads: 2951

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