Monday, June 22, 2015

Checking system-wide uptime on several Cisco hardware platforms

We all know adding redundant supervisors/CPUs to any given system, we can increase the uptime for that system. With In-Service Software Upgrade (ISSU), Cisco hardware even allow us to upgrade the operating system software on-the-fly without stopping the whole system.

Flowers of Cassia fistula was blooming together in southern Taiwan starting from mid-May.
This photo was taken around this location in Baihe District of Tainan City, Taiwan.

An interesting question might be asked. Does Cisco hardware keep track of system uptime even upon supervisor/CPU failover events? And how to display the system uptime, in addition to individual supervisor/CPU uptime?

I spent some time and I summarize my findings in this post.

Sunday, April 12, 2015

Why should we turn off mobile phones when we travel in an airplane, Part 2

With discussion in previous post, we now know the mobile phone’s GSM TDMA signal pattern would generate buzzing sound on audio speakers. Now, how this is buzzing sound related to the safety of air planes?

After watching many videos of “Mayday, Air Crash Investigation” TV programs, I start to understand that today’s plane communications are still running analog technologies. Pilots would hear the buzzing sound generated by your mobile phone.

Fresh tomatos.
Photo taken in Hsinchu County, Taiwan.

Sunday, February 22, 2015

Video @Scale, "Introducing 6-pack, the First Open Hardware Modular Switch"

I really should have found and watched this video earlier!

This video is presented by Yuval Bachar, the same person posted this announcement on the Facebook Blog.

Here are some quick notes I took after watching this video.

Friday, February 20, 2015

Three configuration management features I like about Cisco IOS XR

I like more and more about Cisco IOS XR after I start to play with it. Here are three quick things I like about IOS XR.

Tomato farm and yellow tomato flowers.
Photo taken in 
Hsinchu County, Taiwan.

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