Blog

Scenarios of IGMP Snooping Multicast Forwarding

Apr 16, 2016
IGMP, Multicast

I’ve discussed what is IGMP snooping and its forwarding rules for different packets in my last post. I just want to give some typical scenarios in IGMP snooping for your better understanding. Scenario 1: Switch forwarding multicast traffic to a multicast router and hosts In the topology shown above, the switch acting as a pure L2 device interconnects multicast router, which directly connects to the Source A for multicast group 239. ...

Some words for CCIE candidates

Apr 11, 2016
CCIE, Certificate

I had been planned to be a game/software developer since 10, but I’ve jumped into another industry — network — right after my graduation from college. After dedication of my most of time, I finally have passed three tracks of it – R&S, SP, Sec. Within these years, a lot of people in this industry or not have talked and discussion about CCIE with me. I’d like to share my personal ideas of CCIE about WHAT, WHY and HOW. ...

What is ABR

Apr 9, 2016
ABR, Streaming

ABR is short for Adaptive Bitrate Streaming, which is a technique used in streaming multimedia over networks. While in the past most video streaming technologies utilized streaming protocols such RTP with RTSP, today’s adaptive streaming technologies are almost exclusively based on HTTP and designed to work efficiently over large distributed HTTP networks such as the Internet. It works by detecting a user’s bandwidth in real time and adjusting the quality of a video stream accordingly. ...

BPDU filter VS BPDU guard

Apr 2, 2016
BPDU

I read Michael’s new blog post about how to reduce the possibility of the network unavailable time. He talked about BPDU filter and BPDU guard in his second point, and it was quite a confusion that they seem the same. But actually, they are not. BPDU is short for the phrase Bridge Protocol Data Unit, which is part of the STP that helps describe and identify attributes of a switch port. ...

Troubleshooting is an interactive process

Mar 22, 2016
Trouble Shooting

I believe that everyone who ever has a connection with Cisco whether it is business or personal knows TAC. This team provides post-sales technical support for customers who have bought it. I was once working in a regional ISP and responsible for a range of technical problems. Our department always had a lot of problems that would have been procrastinated, and of course, we thought that they all were Cisco problems’. ...

New Team Leader Todo List

Mar 17, 2016
leadership, team

To be a leader for a team is not as easy as working with machines, because people have their own ideas, attitudes, preferences, and styles of working, etc. I have experienced forming a team and taking over existing teams many times in my working experience, here are some important things I think worth noting for new team leaders. Know your team member It’s definitely worthy to spend time and energy to establish how you want the team to work, but how to express your idea and be accepted by your members should be considered as the first thing for a new team leader todo list. ...

SWOT Analysis for Personal Improvement

Mar 15, 2016
Programming, self-improvement, SWOT

The SWOT analysis is a structured planning method used to evaluate the strengths, weaknesses, opportunities, and threats involved in a project or in a business venture. It involves specifying the objective and identify the internal and external factors that are favorable and unfavorable to achieve that objective. Here we will it SWOT analysis for personal improvement. What does SWOT Analysis do SWOT stands for Strengths, Weaknesses, Opportunities, and Threats. Performing a SWOT Analysis is helpful to use in your career planning for answering the following two questions: ...

openDCIM 3 Install on Ubuntu 14.04

Mar 3, 2016
Linux, openDCIM, Ubuntu

中文版链接 What is openDCIM openDCIM is a free web-based Data Center Infrastructure Management application. DCIM means many different things to many different people, and there is a multitude of commercial applications available. The number one goal for openDCIM is to eliminate the excuse for anybody to ever track their data center inventory using a spreadsheet or word processing document again. installation Install Apache, PHP, MySQL Thanks to apt, This step is incredibly easy. ...

Huawei has published SDN product

Mar 2, 2016
Huawei, SDN

I’ve walked through the news from official website about SDN, which I thought was a missing part of their product line, and found a interesting one. Seems Huawei finally caught up with the SDN bus. I personally don’t think what has been mentioned in the news will bring truly impact to the SDN market, and prefer to take it as only a symbol for Huawei entering the SDN game. Here are some of my reasons: ...

What is IGMP Snooping

Mar 2, 2016
IGMP

What does IGMP Snooping Do IGMP snooping is used to monitor the traffic of IGMP protocol between hosts and multicast-enabled routers. The switch uses it to learn which interface has an interested receiver and forward multicast traffic only to these interfaces. This feature could save bandwidth by allowing it to send traffic only needed, rather than flooding all multicast packets to all interfaces. IGMP Snooping and Forwarding Interfaces To determine how to forward multicast traffic, IGMP snooping maintains a “table” about the interfaces information: ...