This video explains the EIGRP query mechanism, which is used to achieve fast convergence in a network. The query mechanism is triggered when a router loses its successor route and there is no feasible successor route available. In this scenario, the router sends a query message to its neighbors, inquiring about the routing entry information. The neighbors respond with an Acknowledgment (ACK) packet, indicating that they have received the query message. If a neighbor has information about the route, it will send a Reply packet with the route information. If the neighbor does not have information about the route, it will send a Reply packet indicating that it does not have the route. The router can then use this information to converge the route entry. The video also explains how to use a distribution list to filter out unwanted route entries. The query mechanism is divided into three major steps: the initial step, where the router sends a query message to its neighbors; the second step, where the neighbors respond with an ACK packet; and the third step, where the neighbors respond with a Reply packet. The video also demonstrates an experiment to illustrate the query mechanism, where R3 stops announcing the 1.1.0.3/24 route, and R1 loses its successor route. R1 then sends a query message to its neighbors, and R2 responds with a Reply packet indicating that it has another path to the destination network. R1 then switches to the new path and converges the route entry.<br /><br />📱 WhatsApp: https://whatsapp.591lab.com/pingus<br />📞 Skype: https://split.to/591skype<br />✉ Telegram: https://t.me/Lab591<br />📧 Email: marketing@591lab.com <br />------------------------------------------<br />CCIE Lab Consultants<br />📱 WhatsApp: https://whatsapp.591lab.com/IELAB <br />📞 Skype: https://tny.sh/IESkype <br />✉ Telegram: https://t.me/henryHK1<br />📧 Email: HenryWu@591lab.com
