OSPF Summarization is done only on ABR and ASBR routers in your OSPF domain, and use two completely different commands, but what if a router is an ABR and an ASBR? For example, did you know that using the command "default-information originate ..." you are telling the router to create a Type 5 LSA to … Continue reading OSPF: Important details regarding Summarization and Default Routes for exam day, it’s a long but worthwhile read!
I pulled this topology from my older posts when I took a deep dive into the world of LSA's, how to read the Topology table like a laundry list and under stand it, and what type of routers did what. First I want to list links that are absolutely vital to read and understand for … Continue reading A collection of IMPORTANT links to review and know for exam day, then a quick overview of LSA Types / OSPF Router Types!
I was going to bring R1 in on this with a Point-to-Point Serial cable, to make the Topology look a little less pathetic than the usual all out routers everywhere model, however for these topics I only need these 3 - Though I may need to for further IPv6 studies. So far I've confirmed the … Continue reading IPv6 Redistribution, Stub and Total Stub configuration, and some gotchas to watch for on exam day!
(Added interface #'s to the Topology as we increase working with both IP's and interfaces) I wanted to touch this quick before moving on to policy routing, whether Distribute-Lists can block certain networks from a Summary Route, or if it's possibly at all. So I'll run through it quick here to move on: Distribute-List … Continue reading Part 4: The right ACL for the right job (Distribute-List vs Route-Map), Configuring 3-way Route Redistribution with a lot of failures but final success!!!
(The title may be misleading as ACL's will only be used for Distribute-List configuration) As seen above I have though out how to keep all the route tagging that will need to occur straight in my mind, so the route tags for EIGRP will be their AS #'s, and OSPF / RIP will be using … Continue reading Part 3: DEEP Dive into Redistribution with Route-Map tagging, and Distribute-Lists illustrated for clarity!
As previously mentioned I believe, this will be a multi-part lab in which I will configure "Multi-Point" 2-way Redistribution / Policy-Routing / Distribute-Lists / Route-Maps / and troubleshooting all along the way. Here are a few things I know I want to achieve over the several parts of this lab: Authentication deep dive for … Continue reading Part 1: Setting up the new, bigger, and better lab to configure everything we’ve learned up to this point!
Boy do I feel stupid. After spending hours of scratching my head at why this is not working yet, as OSPF seems to be gettings tags but RIP is not, that is when I really put my work under a microscope and found that I was applying OSPF2RIP in OSPF router config and the other … Continue reading Part 3: Finally got Route-Maps for Redistribution working correctly, important notes within on how!
So to begin this, right off the bat I am having trouble seeing some routes on R1 from R4, as I just did a "wr er" and reloaded / reconfigured it to be directly connected. However, on R4, things couldn't possible be going better, I created lo5 and lo15 to simulate those networks from the … Continue reading Part 2: A struggle getting RIP on R1 to get any Redistributed OSPF, may need router reconfigs
Above is a "Single-Point 2-way Redistribution" in our network, which is honestly not going to (probably ever) present a loop from sharing or "leaking"routes back into their own domains, however route-tagging usefulness goes beyond just Redistribution as we will see it I assume in the next topic up PBR (Policy Based Routing / Policy Routing) … Continue reading Part 1: Route-Map tagging for 2-way Redistribution, a prevention mechanism for routing loops!
So where Part 1 of this lab left off, we learned that without that "catch all" clause at the end permitting traffic, then it is dropped like an ACL would. Going through the 2-way Redistribution video, I also learned that sequence #'s do also work exactly like ACL's, so you will want to plan your … Continue reading Part 2: Understanding Route-Map Sequence significance, Clauses, and lots of details to finish this Route-Map lab!
Being that the two way redistribution training gets into route tagging and other fun concepts, I want to just get an easy lab configuration under my belt to get myself started, and will just be working with R3 and R4 as no other routers can see the OSPF routes except R3 after I do this: … Continue reading Part 1: RIP into OSPF 1-way Redistribution, Route-Map lab
I have to say that going from Distribute-Lists where you are just applying standard ACL's to Redistribution is like little league softball compared to Route-Map configuration for them. I planned to study them more before throwing a post up with some lab work getting done, but this is a really exciting topic to me, as … Continue reading An Introduction into the wonderful world of Route-Maps, setting the lab
Being that this lab is already set (see previous post), my EIGRP routes are all showing on R2's ABR R3 as shown below, I am going to write a couple of of Distribution lists. A main point again about Distribute-Lists: You can have more than one, but the more specific dist-list always takes precedence So … Continue reading Finishing look at Distribute-List’s, back to Myself Inc Topology with my new knowledge!
So I must preface this by saying it is the most beautiful day MN has seen in weeks, the sun is out and it's probably mid-high 20's, so it is the perfect day to open the shadows to let the sun in and sit in front of the command line! Ran out and got some … Continue reading Setting up EIGRP to OSPF Redistribution lab, excellent review of concept for exam day
So I am really reeling it back in here, as I think I got over ambitious without learning the basics, so I am just going to do a simple configuration here. For R2, I want to make a Summary route based on the following network numbers: interface Loopback1 ip address 18.104.22.168 255.255.255.255 interface Loopback101 ip … Continue reading Configuration of “Distribute-List”s and 1-way redistribution, with success!!