Skip to main content

Route This Way: (E)IGRP

IGRP information is...scant. It's made by Cisco, and they have since moved on to EIGRP.

  • EIGRP talks to its neighbors it knows via the neighbor table. Neighbors are directly connected.
  • The topology table stores routes it learns from its directly connected neighbors 
  • Hellos are sent every few seconds (Depending on Network capability) to make sure the neighbor is still there. A hold time is around 15 seconds. The router will drop the connection if the neighbor doesn't respond.
  • Routers get updates via multicast address

 New commands -

 🧠 no auto-summary - Back in RIP-land, I advertised the networks using the networks and not the individual IP addresses. ("Summarize at the boundary to the classful network.") You may not wish to do that in EIGRP.

🥏  router eigrp [AS#]
The AS is Autonomous System number. Essentially, "How many routers are under the same networking entity?" Imagine a Botnet, but legal, and helping the internet to run.

🐲 Wildcard masks
With RIP, we could put in the first part (Network, maybe the host) of an IP address and be fine. The router understood it. Now, we have to wildcard-inverse-mask.

Subnet mask of (/24) would be Imagine it as "What's left in this IP segment."

(/30) ( Would be (I think. The 1 and 2 bits at the end remain.)

Router A (I renamed them part of the way through this to better keep track)

Note the subnet wildcard bits.

Onto Router B - and the adjacency is made!

And Router C

show ip route

Look under 'variably subnetted' - see the [90/2681856]?

That is the administrative distance. Lower is better. 90 is EIGRP, 0 (or 1) would be static.

show ip eigrp neighbors

One on the left, and one on the right.

The bits I didn't remember I used resources for, one of which is this. The topology is all mine.


Popular posts from this blog

The Updated "What I'm Looking For In A Role" Post (2020)

Thank you for wanting to help with my job search! Here are some parameters.

Part time remote, text based support [Example Description]. It's a little far fetched, but the positions do exist. I enjoy having the flexibility to take on temporary projects from time to time!
Also; If anything sounds weird, out there, or unusual - Feel free to e-mail me. Doesn't have to be tech related. I just have to find it interesting and flexible.

Looking For This Type of Work:
Simplified writing about tech. [Example Job Description] You want to pay me to write more of *waves hand* this blog? I am game.
IT SupportUX Auditing [See Here]eCommerce merchandising [See Here]Email Marketing Specialist [Example Job Description]  ProofreadingThe following is what I was trained in. Roles will be considered, and I am looking to pivot to the above. Still part-time, contract, and/or temporary
Cisco routing and switching technician

Find me on Jumpstart and CareerVillage.

Remote is…

Azure Networking Options - Core Cloud Services

I have done a lot of AWS things on here. Time to give Azure some attention. After all, since employers don't think Cisco or COMPTIA certifications are important, maybe Microsoft ones are?

First, let's really think about why these are the two biggest cloud services providers in the world:

They've been doing internet things for a long time.Amazon launched in 1995, a virtual bookstore.
Microsoft, well, you know. 

They've lived, breathed, and frankly, created, infrastructure that we use today, that they're selling to us today. Of course the Store of Everything and the Company of Everything would encourage us to put everything in their hands.

Also: Azure has a lot less silly names for modules. Important. I appreciate straightforwardness.

I said 'a lot less', not '100% sensible names'

Microsoft has a clear set of Azure Fundamentals that anyone can interact with. Let's talk about networking basics, basically to say, again, "Hi, employers, I have an …

Grace Hopper Celebration 2019 (GHC19)

From Aicha Evans' speech at the Keynote.
September 6th - I receive an email from Anita B Organization, saying "We read your application, we like your website, and here's a free ticket to GHC 2019 in Orlando, Florida!"

After a few more questions, it seemed everything was on the up and up, and so I accepted - and that's what this post is about!

For those who don't know, Grace Hopper Celebration is the largest gathering of Women in Technology in the world.

On a personal note, This is the first trip I've taken without my parents. Sure, they've left me behind to go on vacations, but I've never left them. I was totally worried! But you know what happened?

I met a lot of cool people in Orlando, learned a lot of neat things, and had a blast just walking around airports for upwards of 8 hours.

New Delta Sky Club on Wikimedia I really, really love airports! And I survived.

I know in the past, I've wormed my way out of jobs despite being interested simpl…