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Troubleshooting Guide

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

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
A RIP Error Occurs due to Discontinuous Subnets

A RIP Error Occurs due to Discontinuous Subnets

Keywords

Discontinuous Subnets, RIP, Error

Abstract

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 172.16.1.0/24 and 192.168.1.0/24 of Switch A, network segments 192.168.1.0/24 and 192.168.2.0/24 of Switch B, and network segments 172.16.2.0/24 and 192.168.2.0/24 of Switch C.

Fault Symptom

A RIP error occurs due to discontinuous subnets.

Procedure

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 172.16.1.0 and 172.16.2.0.

The command output, however, shows that Switch B has only one route to the network segment 172.16.0.0.

Solution

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.

Suggestion

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.

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Updated: 2020-01-07

Document ID: EDOC1000060766

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