AlwaysTheNetwork

Secondary IP Addresses

Colby — Sun, 25 Jul 2010 15:55:32 +0000

This is going to be a short post. I feel guilty for neglecting my blog (stupid ITIL), so I’m throwing this one together real quick. There was a thread on Tech Exams recently, the poster was trying to figure out how to connect two subnets to a single Ethernet interface on a router. This was

Topic Ideas…

Colby — Sun, 25 Jul 2010 15:50:00 +0000

As I explained awhile back, I’m working on the ITILv3 cert and haven’t really been digging into any Cisco/CCIE material. I’m not sure how much longer I’ll be at this ITIL stuff, but I really hate not posting. Without studying, I don’t have a ton of ideas for posts. I have one I’m doing later

Educational IOS Petition

Colby — Wed, 07 Jul 2010 19:45:04 +0000

Greg at Etherealmind has created a petition for an educational IOS version. Details: We the undersigned ask you to sign our petition. We are the people who are learning about Data networking and Cisco IOS software. As students and practitioners, we need to learn theory and knowledge and then to take that knowledge and practice

Studying ITILv3

Colby — Sun, 04 Jul 2010 17:52:29 +0000

Sorry for the horrible lack of updates lately. I had to shift focus a bit to meet a job requirement. It’s come down from the top that everyone in the North American Network group within my company needs to get the ITILv3: Foundations cert by September of this year (ugh!). I’ve been cramming it like

Spanning VLANs Across the WAN

Colby — Wed, 30 Jun 2010 03:56:49 +0000

A thread on Networking Forum led to some interesting conversation and a little mini-lab on my part. If you’re interesting in seeing a use for AToM in the real world, check out the thread. This is the topology I ended up with: To summarize, basically we ran a GRE tunnel across the WAN, then LDP

OSPF Summarization

Colby — Sat, 19 Jun 2010 01:44:22 +0000

This post is about OSPF Summarization. We’ll be using a familiar topology and going over two ways to summarize with OSPF. There are two conventional ways to summarize networks in OSPF, we can use the “area range” command and the “summary-address” command. “Area range” is used on the ABR to summarize networks between areas. The

OSPF Area Types: Not So Totally Stubby

Colby — Fri, 18 Jun 2010 23:58:15 +0000

This is the last post in a series about OSPF Area Types. Today we’ll go over Not So Totally Stubby Areas. We’ll be using the same topology as the NSSA post, but this time we will inject a specific route (40.40.40.0/24) from the ASBR (R4) instead of a default. Quick refresher, OSPF Not So Totally

OSPF Area Types: NSSA

Colby — Tue, 15 Jun 2010 14:02:50 +0000

Today we’ll go over Not So Stubby Areas (NSSA). We will be using a slightly different topology here, we will make R4 an ASBR with a connection to the internet. Quick refresher, OSPF NSSAs have inter and intra-area routes (Type 2 and Type 3 LSAs) and also external routes in the form of Type 7

OSPF Area Types: Totally Stubby

Colby — Mon, 07 Jun 2010 04:45:30 +0000

This is the first post in a series about OSPF Area Types. Today we’ll go over Totally Stubby areas. We’ll be using the same topology as the Stub post. I’m also reposting the first portion of that here since it will be the same. Quick refresher, OSPF Totally Stubby Areas allow only intra-area routes and

OSPF Area Types: Stub

Colby — Sat, 05 Jun 2010 04:03:48 +0000

This is the first post in a series about OSPF Area Types. Today we’ll go over Stub areas. This one will be somewhat short on config, but should have a good amount of show commands. Quick refresher, OSPF Stub Areas allow inter- and intra-area routes (Type 2 and Type 3 LSAs). External routes (Type 5