CCNP Recertification

Posted on Sunday, 7th May 2006 by sean

I was going through my feeds this morning and realized I’m up to 4 other Cisco related blogs (see sidebar), not to mention a few other blogs that occasionally post networking related stuff. This is great! I’ve learned a lot of great tips by reading these blogs, and through my own writing, have [...]

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Posted on Sunday, 16th April 2006 by sean

Multilink PPP is an add on to PPP encapsulation that lets you bond multiple links into one. It can be used over asynchronous dialup to bond multiple modem or ISDN connections, or to bond multiple synchronous serial lines such as T1s.

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Posted on Thursday, 6th April 2006 by sean

Due to my own laziness, I let my CCNP expire over a year ago, which means I have to start at the bottom. I finally passed the CCNA today.

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Posted on Monday, 27th March 2006 by sean

Turns out we had a bad CSU/DSU on a T1 link recently, the thing that made it more difficult was that it was internal to the router (WIC-1DSU-T1)
Troubleshooting serial links is done by testing different parts of the links by looping endpoints.
The basic procedure:
http://www.cisco.com/en/US/tech/tk713/tk628/technologies_tech_note09186a00800a754b.shtml
The difference between loopback dte, loopback remote, and loopback line with pictures. [...]

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Posted on Friday, 10th March 2006 by sean

I’m a self professed Cisco bigot. I use the term “bigot” because that’s what the Nortel sales guy called me and the name stuck. I’ve also heard the term “customer evangelist” thrown around by marketing people — a customer who is happy with the company, and tells others about it.
Why do I willingly [...]

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Posted on Thursday, 9th March 2006 by sean

It’s rare that I open a case with TAC, I’m usually able to figure things out with the help of the docs or by working at it. But this past week, I’ve been involved with several cases:
Upgrade problems – After swapping the flash in a 3660, we couldn’t store an image on the new [...]

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Posted on Thursday, 23rd February 2006 by sean

I got a call from someone in the company yesterday whose husband is getting retrained and is considering a career in network administration. They asked if I could meet with him to tell him about the career. I’m happy to, but what do I say?
Network admin is such an inaccurate term. In both the places [...]

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Posted on Thursday, 26th January 2006 by sean

Just testing posts from the blackberry. I seem to get good ideas on the way to and from work, maybe posting them immediately will help!

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Posted on Monday, 16th January 2006 by sean

An interesting thing happened last week that illustrates how understanding the behaviour of a packet travelling through a network explains the cause of some rather odd traffic patterns.
It was noticed that all active ports on a certain switch would simultaneously see traffic spikes in excess of 8Mbit/s, even though these ports were normally dormant. [...]

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Posted on Friday, 2nd September 2005 by sean

Just finished an online lab through Cisco’s Learning Connection called “Advanced BGP Design with BGP Community Attribute – Challenge Lab – LabOps – IP – Accelerate (SE)”
The CLC has a lot of labs, I look forward to doing more
Start here: http://forums.cisco.com/eforum/servlet/PrepCenter?page=BigSnippet.PrepCenter.PrepCenter_freeTrial_learning_connection
In this lab the object was to learn communities and route-maps. Basically you are [...]

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