AlwaysTheNetwork

%C4K_EBM-4-HOSTFLAPPING

Colby — Thu, 26 Aug 2010 22:36:37 +0000

This means loop! A coworker came to me with an issue today. He asked if I’d ever seen this before and showed me: .Aug 25 22:44:29 UTC: %C4K_EBM-4-HOSTFLAPPING: Host 00:00:85:DE:15:61 in vlan 54 is flapping between port Gi2/4 and port Gi2/2 .Aug 25 22:44:59 UTC: %C4K_EBM-4-HOSTFLAPPING: Host 00:00:85:DE:15:61 in vlan 54 is flapping between port

HSRP Tutorial

Colby — Sun, 22 Aug 2010 03:53:14 +0000

Today’s topic is HSRP (Hot Standby Routing Protocol). HSRP is a Cisco proprietary “First Hop Redundancy Protocol”. It is typically used for redundancy at the first hop from a client segment. It is used with two or more routers in a group who share a virtual IP address. One router is active at a given

Passed ITILv3!!!

Colby — Wed, 18 Aug 2010 20:19:36 +0000

It’s finally over, haha. Now I can get back to Cisco stuff! That was a pretty tough test. The material itself wasn’t easy for me to get into, but eventually I was able to push through it and things started clicking. I feel like I learned some valuable stuff here and there, but all in

IOS Macros

Colby — Mon, 16 Aug 2010 22:41:32 +0000

Here’s another short (but hopefully useful) post. We’ll be going through IOS Macros. I’ve never used IOS Macros before, but I was asked about a problem today, and a macro seems to be an ideal solution. A friend of mine is an engineer for a service provider with a very large network. He has been

Start Your Own Blog

Colby — Mon, 02 Aug 2010 18:06:17 +0000

I had an idea last night and decided to run with it. I’m starting a site to host tech blogs, like wordpress or blogger, but strictly for tech stuff. Not sure if people will be into it, but figured why not. It’s all WordPress, and will likely stay that way. So far all I have

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