EIGRP: Named mode, a whole new type of EIGRP mode, with all new configurations and explanations including “address-family”s!

We will stick with the same old Topology to finish EIGRP review off, I have one more article after this, then I really need to double time some other topics before exam day to freshen up the ol' steel trap! Now a couple of things that separates "Original mode" from "Named mode" EIGRP is: It … Continue reading EIGRP: Named mode, a whole new type of EIGRP mode, with all new configurations and explanations including “address-family”s!

EIGRP: How EIGRP forms relationships over different types of WAN’s (We are getting close to done with EIGRP review)!

Have a few more deep dive sort of Material / Review for EIGRP, and one of them I wanted to be clear on for the exam and out in the wild, is how EIGRP forms relationships over the WAN and why it's important to know what type of WAN is connecting the neighbors. EIGRP over … Continue reading EIGRP: How EIGRP forms relationships over different types of WAN’s (We are getting close to done with EIGRP review)!

EIGRP: Static Neighbors discussion and configuration, then some discussion and configuration of the EIGRP RID (and what its used for) !

Static neighbor discussion, configuration, and why you may not want to deploy this   Static neighbors have been used in every one of my OSPF labs that include the NBMA, for the same reason you might use configure static EIGRP neighbors, and that's because the Layer 2 Media doesn't allow the Adjacencies to form without … Continue reading EIGRP: Static Neighbors discussion and configuration, then some discussion and configuration of the EIGRP RID (and what its used for) !

EIGRP: Convergence refresher: Hello’s, Query’s, Active and SIA Route states, and limiting the scope of Query’s! FUN STUFF!

No diagram for this one, just wanted to post some refresher notes on EIGRP, as its been awhile since I've looked at some fundamentals, and I felt it'd be good to post some refresher on EIGRP network convergence and other things to think about for exam day that aren't technical configurations but just protocol behaviors. … Continue reading EIGRP: Convergence refresher: Hello’s, Query’s, Active and SIA Route states, and limiting the scope of Query’s! FUN STUFF!

EIGRP: DEEP Dive into Route Filtering with Distribute-Lists using ACL’s – Important notes on using Extended ACL’s for exam day!

Only the NBMA and Ethernet segments will be used for quick demonstrations and clarity, unless R4 or R5 is needed for demonstration. The first mechanism specifically for EIGRP to filter EIGRP learned routes is by distribute lists, which have a similar syntax structure and function in ways as an offset-list, in the ways that: It … Continue reading EIGRP: DEEP Dive into Route Filtering with Distribute-Lists using ACL’s – Important notes on using Extended ACL’s for exam day!

EIGRP – IMPORTANT INFO FOR EXAM DAY on K weights and Redistribution, and using an offset-list for Metric tuning!

Only the NBMA and Ethernet segments will be used for quick demonstrations and clarity, unless R4 or R5 is needed for demonstration. There are two different ways to change the Metric for EIGRP, one of those is by changing the "bandwidth" or "delay" on the interface, or by using an offset list. Changing the Metric … Continue reading EIGRP – IMPORTANT INFO FOR EXAM DAY on K weights and Redistribution, and using an offset-list for Metric tuning!

Configuration of EIGRP in IPv6, output examples and differences from v4, and some old IOS code derps!

I sometimes wonder how much it makes network engineers cringe when they look at a blog post (if any engineers do), and see my barely put together Topology not made in Visio as my diagram 🙂 Anyways this should be pretty quick, so far I have only configured the loopback and FastEthernet0/0 interfaces for the … Continue reading Configuration of EIGRP in IPv6, output examples and differences from v4, and some old IOS code derps!

VRF-Lite: Complete configuration and explanation of behaviors, OSPF and EIGRP demonstration and how they work (or why the don’t work)

To note I used the same color I have previously for IPSec VPN tunnels, however that color is more just one of the few colors not reserved for protocols (as I generally use blue for OSPF, red for RIP, and orange for EIGRP), so this time green is for VRF-Lite. So I wanted to pull … Continue reading VRF-Lite: Complete configuration and explanation of behaviors, OSPF and EIGRP demonstration and how they work (or why the don’t work)

Part 5: Turning “IP Routing” on for Layer 3 SW1, Policy / Local Policy Routing, found sub-optimal routing due to AD! (Will be 6th lab to troubleshoot)

I took a quick moment to post before this, advising not to study or lab tired, cause as can be seen towards the end of my Part 4 of this lab I am just tired and swinging at air. Anyway, we now have R1 and R3 both acting as ASBR's, with R1 doing 2-way route-tagged … Continue reading Part 5: Turning “IP Routing” on for Layer 3 SW1, Policy / Local Policy Routing, found sub-optimal routing due to AD! (Will be 6th lab to troubleshoot)

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!!!

(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!!!

Part 3: DEEP Dive into Redistribution with Route-Map tagging, and Distribute-Lists illustrated for clarity!

(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!

Part 2: Deep Dive into EIGRP / OSPF / RIP Authentication, Route Summarization, OSPF troubleshooting to end lab!

Tonight I had a whole agenda of tasks to configure as much as I could on this network, however I was only able to demonstrate authentication configuration for all 3 protocols thoroughly, create a Summary Route for R5, and troubleshoot an OSPF issue that was a bit tricky to catch but finally got it (which … Continue reading Part 2: Deep Dive into EIGRP / OSPF / RIP Authentication, Route Summarization, OSPF troubleshooting to end lab!

Part 1: Setting up the new, bigger, and better lab to configure everything we’ve learned up to this point!

  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!

Finishing look at Distribute-List’s, back to Myself Inc Topology with my new knowledge!

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!

Setting up EIGRP to OSPF Redistribution lab, excellent review of concept for exam day

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