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ME60 V800R010C10SPC500 Feature Description - WAN Access 01

This is ME60 V800R010C10SPC500 Feature Description - WAN Access
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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).
Triggered Update

Triggered Update

Triggered update allows a device to advertise routing information changes immediately, which speeds up network convergence.

Figure 4-6 Networking for triggered update

In Figure 4-6, if the route to 11.4.0.0 becomes unreachable, Device C learns the information first. By default, a RIP-enabled device sends routing updates to its neighbors every 30s. If Device C receives an Update packet from Device B within 30s while Device C is still waiting to send Update packets, Device C learns the incorrect route to 11.4.0.0. In this case, the next hops of the routes from Device B or Device C to network 11.4.0.0 are Device C and Device B respectively, which results in routing loops. If Device C sends an Update packet to Device B immediately after it detects a network, Device B can rapidly update its routing table, which prevents routing loops.

In addition, if the next hop of a route becomes unavailable due to a link failure, the local Device sets the cost of the route to 16 and then advertises the route immediately to its neighbors. This process is called route poisoning.

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Updated: 2019-01-04

Document ID: EDOC1100059473

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