Haven't update the blog for a while as I was busy at work, study and personal live.  During Christmas I want to watch a movie, and I...

My broadband link is not as stable as what I expect, and it goes up / down from time to time.  When it goes up and down, the public inter...

I have a Cisco 1841 router running in my lab, running code 15.0(1)M, experienced high CPU (9x% in most of the time) after I started to manag...

Maybe you will answer NO immediately.  That is my understanding before too!  However recently I've found out this is not the case!  I...

My lab environment:  XE 3.6.0 To start playing with 3850 unified access, it is quite simple.  The first thing to do is to enable the web ...

This is a demonstration to quickly demo what a OnePK application could do.  The java application is based on the tutorial application in the...

My environment:  15.0(1)SE3, 3560 8-port switch IP SLA VO is a tools to simulate video traffic in a network, especially you want to test t...

Scenario: In this scenario there are 3 routers interconnected, with 3 VRFs namely Android, IOS and WP7 created.  VNET trunk is configured in...

They are more or less the same in the IPv4 world.  The only difference is, set dscp will work for I Pv4 and IPv6 and set ip dscp is for I...

Recently OTV is introduced to the ASR 1000 platform and is supported starting from IOS XE 3.5.  Basically the OTV support on ASR1K and N7K i...

I am using a 3560-8PC PoE switch in my home lab and in order to save my electric bill, energywise has been implemented on the switchport in ...

IETF draft -  http://tools.ietf.org/html/draft-ietf-lisp-15 What is LISP? enables separation of IP addresses into two new numbering spaces:...

I have spent a couple of days to study LISP, and I have summarized what I have learnt in the following pencast. Feel free to take a look an...

My environment:  IOS 15.1(3)T on ISR 892 I have been spending quite a lot of time on the road and it is much convenient if I have a way to r...

EIGRP Stub Leak is a feature on Cisco router which allows EIGRP stub routers to leak route to peer routers.  This is achieved by leak-map, w...

My environment: Cisco 3560E, IOS 12.2(53)SE Auto Smartports Macros is a feature that provide easy and automatic way in deploying switchpor...

The switch recognize the device via CDP or by other customized ways to autoprovision the switchport configuration based on what kinds of dev...

My environment: RH FC8 x86_64 1. Make sure the 802.1q module is added to the kernel   modprobe 8021q 2. Add a subinterface.  In this e...

You’ll need the proper SDM template to enable v4, v6 dual stack on 3560/3750/3560E/3750E Switch(config) # sdm prefer dual-ipv4-and-ipv6 de...

My environment: Cisco Catalyst 3560E IOS: 12.2(50)SE2, Advanced IP services This is a handy feature provides quick and easy way to deplo...