Cisco 3750G Gigabit Layer 3 switch teardown, a detailed overview for CCNA lab and repair
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- Опубликовано: 19 фев 2016
- Very detailed overview and a full tear-down of a Cisco 3750G-24TS-S gigabit Layer 3 switch.
Since these switches are highly successful, they are used in a large number of companies and organisations as a distribution layer switch. This is why I though that it would be interesting and informative to do an educational video on the Cisco 3750G from the perspective of the CCNA certification and also for repair technicians.
The video is divided in three main sections:
1.) in the first portion I go over the ports, feature sets, Stackwise and related informations
2.) the middle section of the video shows the dismantled motherboard looking at it like a CCNA candidate would, going into the boot process and trying to give a short brainstorming on what happens to a packet using the OSI model
3.) in the last portion the individual components are shown under a 10X optical magnification, so that we can figure out what are the components doing to help out repair technicians. Due to the long material, the third portion will be shown in a separate video.
Parts list for the Mainboard discussed in the video:
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Route Processor: Cisco Yeti (based on IBM PowerPC 405)
ASIC for Layer 2 and Layer 3 switching: Cisco Sasquatch-I
TCAM: Renases R8A20100BA (Marie series network processor and search engine)
Buffer RAM for Store-and-Forward: Samsung K7N401801B
Flash: 16MB chip from Intel for the IOS
NVRAM: the flash contains also startup-config.txt and vlan.dat
DRAM: SDRAM from Samsung
ROMMON: I could not find where is the ROMMON located
Serial Console: Max3232 RS232 transceiver
Parts list for the components:
====================================
These are presented in Part2 of this video series.
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Your abstract remarks (i.e. zombies, whitney houston etc) are so much hearten. Your way of narration is outstanding! Thank you for all your efforts, hope you will be good and we are looking forward for further material, these tutorials has a reasonable high demand
Wow, what a blast from the past!
I agree completely with comment by Nicholas Lester! Thank you for taking the time to make this great content available! This is so much more than typical "Cisco on RUclips!" -jh
Thank you so much for the very useful information
Wow! Excellent video. So informative. You are very thorough and you really make it easy to visualize how data moves through the switch circuitry. Thanks so much!
This helped me understand what is going on inside a switch for my CCNA studies. I now have a better grasp of why IOS is set up the way it is. In particular I was wanting to get more information on the data plane - and there it is in real life! Super great video.
Thank you for the very helpful and educational video!
great overview, interesting details, I found it very useful. I love how you wiggle wiggle your pen :)
I have one question. Where is the time domain reflectometer (tdr) module?
Regarding the ROMMON being in the Flash, that makes sense. That was also what I was thinking about. However, I did not dare to say it, because if do do a
'Unicorns or UFO's, idk' lmao
Very nice explanation! Thanks a lot!
I have one of the same series, but not the same as the one you present. and the same happens, it does not start, no LED, no CONSOLE. SMPS OK. I got that the transceiver chips (BROADCOM BCM5466R) are like overheated, (heat marks around the IC on the PCB) and a small short in the tantalum capacitors. could you advise me what to do, thanks ...
those chips next to ASICs are SRAM chips. They may run on anything between 225MHz to 350MHz, with a bit of luck they may run on 400MHz, but that is pretty much a limit for out of chip SRAM
Hi, do you have ios 15 for 3750g ?
Great and rare, Thanks very much
Thannks for this great video. Excellent job. I have no idea about this stuff. Would I be able to buy this reset it and then use it as a simple 24 port switch. Like plug and play. I mean I just connect my internet to it and then plug all my other computers into it?
Very good knowledge of Cisco switch. I really want to know where did u learnt all this. I know no university or certification teaches u these things. I want to follow on your footsteps to learn. Thanks
I think rommon located on same flash where ios located, but in different partition, which is quite common practice in embedded systems.
Where did you learn all this? Is there documentation or some resource we can look through ourselves? What about other devices like 4500/6500/Nexus, ISR routers, etc. This is ammmmaaaaazin!!!