Above is the lab that this post turns into pretty fast once the MPLS is live and installs itself around on EIGRP routers, lots of good info, I advise trying to make through this post if you are rusty on EIGRP Path Selection configuration! 🙂 How EIGRP Calculates Metrics, Topology Table, and Feasibility Condition By … Continue reading EIGRP – Metric review, random “offset-list” lab for Path Selection, Feasibility Condition and Variance discussion, and will PBR config override offset-list?
I have added loopbacks to simulate some EIGRP Networks behind our two Stub routers, to demonstrate some different concepts such as Summary Address and Leak-Maps, however I will start right at the beginning of EIGRP Stub routing and what it does. My labbing kind of got long winded but I really wanted to drive some … Continue reading EIGRP – Stub review, default behaviors, basic configuration, Summary-Address and Leak-Maps config, and verification!
Using this Topology I will work across the EIGRP Domain using EIGRP Named Mode, possibly mixing some "Classic" mode EIGRP Routers in there as well, just to see how things are different once I've gotten into a Named Mode groove of configuration. Honestly before running through this lab (when studying for my CCNP R/S) I … Continue reading EIGRP – Quick review of EIGRP Named Mode, walk through of “Named Mode” EIGRP Configuration with Authentication across the entire EIGRP AS 100 Domain!
The above Topology has already been configured with its respective IP Addressing / Routing Protocols, all Adjacencies are Up/Up, and we are ready to jump straight into NHRP (Next Hop Resolution Protocol) configuration on the Hub / NHS (Next Hop Server) which will be PHX1 Router in this Topology and then onto the DMVPN Spokes! … Continue reading DMVPN – Huge DMVPN Lab, multi-branch deployment considerations, Phase 1 to Phase 2 DMVPN clearly demonstrated, lots of configuration and verification!
To round off Redistribution series of posts for Dynamic Routing Redistribution, what better way to drive it home, than to Redistribute every Dynamic Routing Domain into every other one and see what we can break? There will be a LOT of output from this lab to demonstrate how to verify and configure / troubleshoot everything … Continue reading TSHOOT – Redistribution Part 5 – The OSPF / EIGRP / BGP / Redistribution lab!
The above graphic is a visual demonstration of how Redistributing routes works, as we are not taking one route from a routing protocol and placing it into another protocol, we are taking routes from the IP table and placing it into "routing protocol data structures" if you remember that phrase. What Route Redistribution is at … Continue reading TSHOOT – Redistribution Part 2 – Detailed review of Redistribution, Seed Metric, RIPv2, RIPng, EIGRP IPv4 and IPv6 behaviors and troubleshooting!
While getting together some command prompt syntax from my lab, I got a jolt of nostalgia from labbing ROUTE, and decided to instead configure the lab Topology shown above as I started configuring my switches for Layer 3 routing and before I knew it I was troubleshooting OSPF and EIGRP Ajdacencies! I will try to … Continue reading TSHOOT – Redistribution Part 1 – Configuring an OSPF / EIGRP / iBGP Lab to completion, ready for Redistribution!
The displayed Topology is just an image from a ROUTE lab I ran through years ago, however most of the Review / Troubleshooting will be reviewed in IPv4 as it is exactly the same in IPv6 mode, literally only difference is the IPv6 Multicast Address. Named Mode EIGRP is a whole nother animal, it should … Continue reading TSHOOT – EIGRP for IPv4, IPv6, and the beast of a topic EIGRP “Named Mode” review and troubleshooting!
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) !
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!
Only the NBMA and Ethernet segments will be used for quick demonstrations and clarity, unless R4 or R5 is needed for demonstration. Now the idea of a Prefix-List in comparison to an Access-List may be hard to follow, but I will try to explain it. An Access-List at its most specific (Extended) matches only on … Continue reading EIGRP: DEEP Dive into Prefix-List configurations, Access-list vs Prefix-list, using Prefix-Lists to Filter EIGRP routes with Distribute-Lists!
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!
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!
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)
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)