You cannot limit EIGRP queries by issuing the ip hello-interval eigrp as-number seconds command, which is used to adjust the hello timer interval. Therefore, creating a separate AS will not limit EIGRP queries. Queries are sent from neighbor to neighbor throughout a network, even from one AS to another. You cannot limit EIGRP queries by issuing the router eigrp as-number command, which is used to create an EIGRP process for an autonomous system (AS). Thus route summarization creates a query boundary that prevents queries from propagating throughout the network. If a neighbor router has a summarized route but does not have the specific route to the destination network in the query, the neighbor router will reply that it does not have a route to the destination network and will not query its neighbors. The ip summary-address eigrp as-number address mask command limits EIGRP queries by configuring route summarization. The hub router will specify in its neighbor table that the router is a stub router and will no longer send query packets to that stub router, thereby limiting how far EIGRP queries spread throughout a network. A hub router detects that a router is a stub router by examining the TypeLengthValue (TLV) field within EIGRP hello packets sent by the router. Stub routers advertise only a specified set of routes and therefore typically need only a default route from the hub router. The eigrp stub command limits EIGRP queries by creating a stub router. Limiting EIGRP queries prevents queries from consuming bandwidth and processor resources and prevents routers from becoming SIA. The network cannot converge until all the replies have been received, which can cause a router to become stuck in active (SIA). This process continues until either a router replies with the route or there are no routers left to query. However, if a neighbor does not have a route to the destination network, it queries its neighbors, those neighbors query their neighbors, and so on. If a neighbor has a route to the destination network, it replies with the route. When a router does not have a feasible successor, it floods query packets to its neighbors. Query packets are sent to find feasible successors to a destination network.
You can issue the eigrp stub command or the ip summary-address eigrp as-number address mask command to limit Enhanced Interior Gateway Routing Protocol ( EIGRP) queries.
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