2 Comments on “Which timer expiration can lead to an EIGRP route becoming stuck in active?”

1. Scooby says:

   November 26, 2015 at 7:27 pm

   Explanation:
   As noted above, when a route goes into the active state, the router queries its neighbors to find a
   path to the pertinent network. At this point, the router starts a three minute active timer by which
   time it must receive replies from all queried neighbors. If a neighbor has feasible successors for
   the route, it will recalculate its own local distance to the network and report this back. However, if a neighbor does not have a feasible successor, it also goes into active state. In some cases,
   multiple routers along multiple query paths will go into active state as routers continue to query for
   the desired route. In most cases, this process will yield responses from all queried routers and the
   sought after route will transition back into the passive state within the three minute SIA query
   timer. In the case that none of the queried routers can provide a feasible successor, the route is
   cleared.
   In some cases, a response is not received between two neighbor routers because of link failures,
   congestion or some other adverse condition in either the network or on the queried router, and the
   three minute active timer expires on the router originating the query. When this happens, the
   querying router that did not receive a response logs a “DUAL-3-SIA” or “stuck-in-active” error for
   the route and then drops and restarts its adjacency with the non-responding router
   Reference. http://www.packetdesign.com/resources/technical-briefs/diagnosing-eigrp-stuck-active

   
   
   
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2. Maluco Beleza says:

   February 26, 2017 at 4:27 pm

   I believe it is C. The absence of response to a Query leads to the SIA state. I do not see anything related to active timer.

   
   
   
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