Switch

ASIC Programmability from Barefoot Networks

2017-01-30 ·5 min read

Full disclosure : I was lucky to be among a group of networking influencers invited to Silicon Valley to visit some networking companies and see what they were offering to the market. I was flown out …

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News - Cisco Announces EOL Schedule for 6500s

2011-04-01 ·1 min read

This is a surprise, but Cisco has announced the end of life of the 6500 switches that we all know and love. Usually Cisco gives a platform a few more years after they decide to retire it, but the …

6500 april day eol fools switch

Stubby Post - Null VTP Domain Scare

2011-01-05 ·2 min read

Remember a few weeks back when I had a bad day? I was actually at HQ that day to do some work for a project, but that got put off due to the extenuating circumstances. When we finally got back around …

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Stubby Post - VTP Clients Send Updates

2010-05-18 ·1 min read

VTP clients send VLAN updates. Did you know that? I had a VTP server and client in the same VTP domain, and, when I cabled up the trunk, the client overwrote the VLAN database on the server. The moral …

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SWITCH - Epic Regression

2010-05-11 ·2 min read

Just because I like giving more money to Pearson Vue, I took the BCMSN test today to see how I would do. I passed with no problem. In my mind, the CCNP is a technical certification, so I expect to be …

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SWITCH - Epic Fail

2010-05-06 ·4 min read

I did my standard 2ish-hour drive to the closest testing center today to take the SWTCH test (642-813). Utter failure. That’s 3 for those scoring at home. The test was the absolute worst I’ve ever …

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Stubby Post - UplinkFast

2010-04-28 ·3 min read

I’ve got a few switches daisy chained together with single links and have enabled UplinkFast on them. This switch is not the root bridge; F0/24 is the root port and F0/23 is a blocked alternate …

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Stubby Post - Path Cost of EtherChannels

2010-04-27 ·1 min read

I was doing some STP labs tonight and found something that caught me off guard a bit. I had been meddling with some EtherChannels between a pair of 3750s earlier today, and I forgot to reset the …

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SWITCH – STP Exercise #1 Solution

2010-04-24 ·4 min read

Did you guys have any trouble with the solution to the STP exercise? Let’s work through it and see what happens. I got a few responses to the solution, and everyone seems to get the same answer, …

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SWITCH - STP Exercise #1

2010-04-22 ·1 min read

Here’s an STP exercise for you. Given the bridge priorities, MAC addresses, and interface types in the diagram, calculate the root bridge, root ports, designated ports, and blocked ports. You …

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