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“show archive config differences” is your Friend
This is the most important command I always use to run in my day to day configurations. It helped me a lot during my R&S lab exam as certain config commands would break something which you...
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No Studies for 3 Days….
I had to take 3 days off from my studies as it was my wife’s B’day & had to keep my family happy . My mother in-law also with us (assisting to look after 5 months old baby). I am taking time off...
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CAPWAP Packet Analysis using wireshark
How do you to see the CAPWAP encapsulated packets (AP <-> WLC in controller based wireless deployment) using a wireshark ? By default if you span the port connected to Light Weight Access point...
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Configuring Multicast on WLC
Cisco Wireless LAN controllers (WLC) perform multicast in two methods. 1. Unicast Mode (WLC unicast every multicast packet to every access point associated to the controller). This mode is inefficient,...
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3750/3560/2960 Wired QoS
Recently I designed a QoS template for our campus environment (3750 Access & 6500 for Core/Distribution). I thought of writing this post would help you/me to understand what it involve configuring...
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Understanding Wireless QoS – Part 1
After reading few online posts about wireless QoS, I felt it is worth to spend some time to understand what’s going on packet level. So this will be the first part of wireless QoS related posts. I have...
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Understanding Wireless QoS – Part 2
This is the continuation from my previous post (Understanding Wireless QoS – Part 1) about Wireless QoS. So far we have looked at so far packet going from C7921 phone to wired PC-softphone. Few key...
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Free Wireless Packets Captures
If you try to capture wireless traffic by selecting wireless interface on wireshark, it will not accurately capture the wireless packets over the air. Normally you require separate wireless adapter to...
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Understanding Wireless QoS – Part 3
So far we have looked at how a packet’s QoS label (DSCP/CoS/WMM_UP) changing at different points on its journey to wireless side to wired & vice versa. I have used Platinum QoS settings on WLC...
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Who do you trust ? (DSCP or CoS)
In this post I will look at closely WLC connected switch port QoS configurations. As you know there are 3 values you can trust. DSCP, IPP (layer 3 packet ) & CoS (layer 2 frame). DSCP is the most...
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Understanding Wireless QoS – Part 4
Before looking into packet level QoS detail when WMM disabled/ or Non WMM client traffic goes in WMM enabled wireless network we will see how QoS configurations will be done on WLC. There are 4 QoS...
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Understanding Wireless QoS – Part 5
This would be the last post of the 5 part series “Understanding wireless QoS posts”. In this post we will look at How QoS value change under two specific conditions. 1.Cient is WMM capable, WMM is...
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Do you know enough about CCIEW v2.0
CCIE certification is not always measure about your technical skills. It is also about your time management skills, selecting a best approach suit to you (there are unique ways of nailing the exam by...
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Wireless Multicast is not working – Why ?
If you read my previous two post about Multicast ( Test Yourself- Basic Multicast & Configuring Multicast on WLC) , it is straight forward to configure multicast in a wireless network. Please read...
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How many CCIEs are in the World ?
How many CCIEs are in the world ? Since Cisco is now not publish these stats at regularly (as they did in the past) It is very hard to find accurate answer to this. But by looking at the CCIE number of...
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Understanding “VideoStream” feature
Before go into details of “video stream” feature we will look at how WLC handle a multicast packet without this feature. I have used the following basic setup for testing. WLC is configured for...
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IGMP Basics
Internet Group Management Protocol (IGMP) used by a Host to notify the local Router that it wishes to receive (or stop receiving) multicast traffic for a given group address. Below diagram shows a...
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Multicast Address Allocation
When I did multicast testing on my wireless network last couple of days I noticed few things may worth to note here. First thing is the group addresses used by different services which we may not aware...
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Top 10 Recommendations for VoWLAN
When I am searching for Voice over WiFi materials , I found below material presented by Flavien RICHARD during Ciscolive- Cancun (Nov-2012). You must watch this session (recorded version) & it is...
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Understanding DHCP
DHCP (Dynamic Host Configuration Protocol) is one of the most common protocols that everyone understand what it does. But very few of them spend time to learn how it work. So in this post we will look...
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