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 590 Lessons. More Lessons Added Every Week!
  • Content created by Rene Molenaar (CCIE #41726)


317 New Members signed up the last 30 days!


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

Forum Replies

  1. Hi !!!

    Plesea, you can check pictrue 7, i can’t see Fa0/2 on router Spade. It’s two port Fa0/0 ???

  2. Thanks for pointing that out, I just fixed it!

  3. system says:

    Hi Rene
    Very simple yet brilliant exaple of LIVE lab. I am very happy to find this post and recommand to anyone who wants to be CCNA, cheers Ajay NZ

  4. Hi Rene

    ip summary-address rip

    What’s the purpose of configuring a route summary as shown above?
    It seems like without the summary, routing works just as well.
    Thank you.

  5. Hi Saw,

    Let’s imagine we have two routers, R1 and R2. R1 has 8 interfaces. We advertise 8 subnets from R1 to R2. In this case, R2 will have 8 entries in its routing table. When one of the interfaces on R1 goes down, R2 will lose the subnet in its routing table. Depending on the routing protocol, it will act upon this, trying to find another path.

    If we would advertise a summary route that matches all 8 subnets on R1 instead, then R2 would only have 1 entry in its routing table. This will save some memory. The second advantage is that when one of the interfaces on R1 goes down, it doesn’t affect the summary that R2 has in its routing table. This makes things a bit more stable.

    On small networks this doesn’t matter all that much but when you think about the Internet, summarization becomes very important.

    Hope this helps!


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