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ME60 V800R010C10SPC500 Feature Description - WAN Access 01

This is ME60 V800R010C10SPC500 Feature Description - WAN Access
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Triggered Update

Triggered Update

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

Figure 5-6 Networking for triggered update

In Figure 5-6, if network 123::0 is unreachable, Device C learns the information first. By default, a RIPng-enabled device sends Update packets to its neighbors every 30 seconds. If Device C receives an Update packet from Device B within 30s when Device C is still waiting to send Update packets, Device C learns the incorrect route to 123::0. In this case, the next hops of the routes from Device B and Device C to 123::0 are Device C andDevice B, respectively, which results in routing loops. If Device C sends an Update packet to Device B immediately after it detects a network fault, 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 Router sets the cost of the route to 16 and then advertises the route immediately to its neighbors. This process is called route poisoning.

Updated: 2019-01-04

Document ID: EDOC1100059473

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