We're Sorry, Full Content Access is for Members Only...

If you like to keep on reading, Become a Member Now! Here is Why:

  • Learn any CCNA, CCNP and CCIE R&S Topic. Explained As Simple As Possible.
  • Try for Just $1. The Best Dollar You've Ever Spent on Your Cisco Career!
  • Full Access to our 581 Lessons. More Lessons Added Every Week!
  • Content created by Rene Molenaar (CCIE #41726)

 

295 New Members signed up the last 30 days!

satisfaction-guaranteed

100% Satisfaction Guaranteed!
You may cancel your monthly membership at any time.
No Questions Asked!


Forum Replies

  1. great explanation ,thank you.

  2. Hi Hussein,

    Just like RIP, EIGRP uses route poisoning. In case of EIGRP, the route is poisoned by using an update message with the metric set as infinity.

    Rene

  3. Hi Ricardo,

    I believe it's a fixed timer, you can't change it and it's not based on the hello/hold timers.

    Rene

  4. Hi Paul,
    You generally have it right. The short answer is after 90 seconds, an SIA-Query is sent.

    The longer answer:

    Each router manages its own SIA Query and SIA Query Response management. This means that as soon as each router has put a route in Active (regardless of whether the router in question was the actual first router to start the process) and has sent a Query to its neighbors, that router also starts a timer. At 90 seconds, for each neighbor from which it has not received a reply, it will send an SIA Query to check on the status of the original query. Any of those other routers that, themselves, are also waiting on a Reply from others will respond back to the router that gave the SIA-Query with an SIA-Reply. Any neighbor that does not respond to an SIA-Query by the time the original timer reaches 3 minutes will be considered stuck in active.

  5. If a route/neighbour fails, how can you recover from SIA? Recycle the interface facing the neighbour that’s down?

    I’m also curious how you can simulate this in GNS3. Surely the main cause of SIA is congestion? How did you replicate the replys from R2 not reaching R1? Use an ACL?

37 more replies! Ask a question or join the discussion by visiting our Community Forum