Query and active status of the source image in the source image. The source image is in the active status and the source image is in the SIA status.

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Query procedure:

Topology: A is the one-hop router of bcde, and B is the successor router of CDE.

10.0 of the vrouters are disconnected, and 10.0 of a enters the active state. A will send a query to bcde. After receiving the query, the CDE will know that a cannot access the 10.0 network, immediately put the successor router B in the routing table and send a reply to replay. A disconnects the active status of CDE. Because B does not have the successor router, it sends a query to CDE. After receiving the query, because CDE has no successor router, A sends a query to A. After receiving the query, A sends a replay to CDE, telling them that they have not gone to the 10.0 query and cde converges again, then, reply relplay to B and tell B that they do not have a route. Router a re-enable dual algorithm to re-converge, and route 10.0 enters the SIA status.

Active status (including improved SIA query-sia reply): If the neighbor Router does not reply within 3 minutes, when the time is over half, a sends a SIA query to the neighbor router, if the neighbor has a reply to keep the neighbor's status, if the neighbor does not reply, then router A enters the SIA status and resets the adjacent relationship with the unresponded neighbor.

This article from the "heart to create the future" blog, please be sure to keep this source http://fengkuanglaolou.blog.51cto.com/9657652/1583915

Query and active status of the source image in the source image. The source image is in the active status and the source image is in the SIA status.