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Network Engineer Pro
United States
Registrace 22. 12. 2019
Welcome to Network Engineer Pro !
I'm Rafael, US Army Veteran and CCIE Enterprise 64356. This channel is dedicated to helping as many people as possible learn computer networking (mostly Cisco) and get hired. Learning networking and getting certified with a Cisco CCNA , CCNP or CCIE will absolutely change your life. I'll be posting tutorial videos on networking technologies, not just theory but hands on too. If you want to learn networking, get certified and get hired then subscribe to the channel for awesome networking content.
I'm Rafael, US Army Veteran and CCIE Enterprise 64356. This channel is dedicated to helping as many people as possible learn computer networking (mostly Cisco) and get hired. Learning networking and getting certified with a Cisco CCNA , CCNP or CCIE will absolutely change your life. I'll be posting tutorial videos on networking technologies, not just theory but hands on too. If you want to learn networking, get certified and get hired then subscribe to the channel for awesome networking content.
BGP AS Override Lab - EVE-NG Lab for CCNP and CCIE
GET THIS LAB RIGHT NOW!
www.networkengineerpro.com/cisco-eve-ng-lab-library/bgp-as-override
Welcome to Network Engineer Pro. I'm Rafael, CCIE 64356.
I'm working on ton of content (videos, labs and more) to help you learn networking. If you want to stay up to date on what I'm working on and be the first to know then head to my website where you can sign up and get notified:
➤ www.networkengineerpro.com/
You can also follow me on Facebook:
➤ NetworkEngineerPro
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Loop prevention in BGP is done by verifying the AS number in the AS Path. If the receiving router sees its own AS number in the AS Path of the received BGP packet, the packet is dropped. The receiving Router assumes that the packet was originated from its own AS and has reached the same place from where it originated initially.
The feature could be a disaster if customers are using same AS number along the various sites and disallows customer sites having identical AS numbers to be linked by another AS number. In such a scenario, routing updates from one site will be dropped when the other site receives them.
To override this feature, AS-Override function causes to replace the AS number of originating router with the AS number of the sending BGP router. The command is neighbor ip-address as-override and can only be executed under the VPNv4 address-family.
BGP AS Override needs to be understood well in order to understand the BGP loop prevention behavior, But why BGP AS Override might create a dangerous situation, and what are the alternatives of BGP AS Override will be explained in this post.
What is BGP AS Override
BGP AS Override feature is used to change the AS number or numbers in the AS Path attribute. Without BGP AS-Override, let's see what would happen.
In this topology, Customer BGP AS is AS 100. The customer has two locations. Service Provider, in the middle, let's say providing MPLS VPN service for the customer. As you can understand from the topology, Service Provider is running EBGP with the Customer, because they have different BGP Autonomous Systems.
The service provider in the above topology has BGP AS 200. Left customer router, when it advertises BGP update message to the R2, R2 sends to R3 and when R3 sends to R4, R4 wouldn't accept the BGP update, When R4 receives that update, it will check the AS-Path attribute and would see its own BGP AS number in the AS Path. Thus is by default rejected, due to EBGP loop prevention. If the router sees its own BGP AS number, anywhere (Origin AS, any mid-AS, or last AS) in the AS Path, it doesn't accept the BGP update. But what if, like in the above picture, the customer wants to, or needs to use the same BGP AS number in every location that they have.
In this case, they need to accept the BGP update, otherwise, end-to-end reachability cannot be achieved. There are two solutions to the above requirement. By the way, not accepting prefixes/BGP updates is not a problem. It is just how BGP works. One of the solutions is, that R2 receives a BGP update from R1 with AS 100, then R3 receives from R2, and in the BGP AS Path, it is still AS 100 at R3. With BGP AS Override feature, R3 can change customers' BGP AS numbers with its own BGP AS number. So, R3 during advertisement to R4 replaces BGP AS 100 with BGP AS 200.
Change the AS number with its own AS number. And finally, when R4 receives it since it won't see its own AS number in the BGP update, R4 accepted the announcements, and end-to-end connectivity is achieved. In the next post, we will look at what can be the problem if the BGP AS Override feature is used.
BGP’s one of the key loop prevention mechanism is to match the AS number in the AS path of the received BGP update.
If the BGP AS-path attribute has the AS number of the receiving router in then that BGP route is not installed in the BGP routing table.
This BGP feature though useful for loop prevention can sometimes cause issues in the network (especially for a big enterprise spanning across multiple locations) where a customer has multiple sites spread geographically, connected by some ISP and using the same AS number.
AS Override :
Its feature allows a provider edge (PE) router to change private autonomous system used by customer edge (CE) device on an external BGP session running on a VPN routing and forwarding access link. The private AS number is changed to PEAS number.
www.networkengineerpro.com/cisco-eve-ng-lab-library/bgp-as-override
Welcome to Network Engineer Pro. I'm Rafael, CCIE 64356.
I'm working on ton of content (videos, labs and more) to help you learn networking. If you want to stay up to date on what I'm working on and be the first to know then head to my website where you can sign up and get notified:
➤ www.networkengineerpro.com/
You can also follow me on Facebook:
➤ NetworkEngineerPro
--------------------------------------------------------------------------------------------------------------
Loop prevention in BGP is done by verifying the AS number in the AS Path. If the receiving router sees its own AS number in the AS Path of the received BGP packet, the packet is dropped. The receiving Router assumes that the packet was originated from its own AS and has reached the same place from where it originated initially.
The feature could be a disaster if customers are using same AS number along the various sites and disallows customer sites having identical AS numbers to be linked by another AS number. In such a scenario, routing updates from one site will be dropped when the other site receives them.
To override this feature, AS-Override function causes to replace the AS number of originating router with the AS number of the sending BGP router. The command is neighbor ip-address as-override and can only be executed under the VPNv4 address-family.
BGP AS Override needs to be understood well in order to understand the BGP loop prevention behavior, But why BGP AS Override might create a dangerous situation, and what are the alternatives of BGP AS Override will be explained in this post.
What is BGP AS Override
BGP AS Override feature is used to change the AS number or numbers in the AS Path attribute. Without BGP AS-Override, let's see what would happen.
In this topology, Customer BGP AS is AS 100. The customer has two locations. Service Provider, in the middle, let's say providing MPLS VPN service for the customer. As you can understand from the topology, Service Provider is running EBGP with the Customer, because they have different BGP Autonomous Systems.
The service provider in the above topology has BGP AS 200. Left customer router, when it advertises BGP update message to the R2, R2 sends to R3 and when R3 sends to R4, R4 wouldn't accept the BGP update, When R4 receives that update, it will check the AS-Path attribute and would see its own BGP AS number in the AS Path. Thus is by default rejected, due to EBGP loop prevention. If the router sees its own BGP AS number, anywhere (Origin AS, any mid-AS, or last AS) in the AS Path, it doesn't accept the BGP update. But what if, like in the above picture, the customer wants to, or needs to use the same BGP AS number in every location that they have.
In this case, they need to accept the BGP update, otherwise, end-to-end reachability cannot be achieved. There are two solutions to the above requirement. By the way, not accepting prefixes/BGP updates is not a problem. It is just how BGP works. One of the solutions is, that R2 receives a BGP update from R1 with AS 100, then R3 receives from R2, and in the BGP AS Path, it is still AS 100 at R3. With BGP AS Override feature, R3 can change customers' BGP AS numbers with its own BGP AS number. So, R3 during advertisement to R4 replaces BGP AS 100 with BGP AS 200.
Change the AS number with its own AS number. And finally, when R4 receives it since it won't see its own AS number in the BGP update, R4 accepted the announcements, and end-to-end connectivity is achieved. In the next post, we will look at what can be the problem if the BGP AS Override feature is used.
BGP’s one of the key loop prevention mechanism is to match the AS number in the AS path of the received BGP update.
If the BGP AS-path attribute has the AS number of the receiving router in then that BGP route is not installed in the BGP routing table.
This BGP feature though useful for loop prevention can sometimes cause issues in the network (especially for a big enterprise spanning across multiple locations) where a customer has multiple sites spread geographically, connected by some ISP and using the same AS number.
AS Override :
Its feature allows a provider edge (PE) router to change private autonomous system used by customer edge (CE) device on an external BGP session running on a VPN routing and forwarding access link. The private AS number is changed to PEAS number.
zhlédnutí: 741
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Your videos are always a great help, as a person who recently got his own CCNA I'll be checking your channels but also upset for the fact that you don't get that much of a view that you deserve...wish you reach to what you truly need to grow...
Wow congratulations on getting the CCNA! What's next? Thanks for the comment I appreciate it. One day I'll get there I just need to work on more content and post it. Thanks for watching !
CCIE excellent can expedite MPLSL3VPN
HI Raphael. your videos are amazing. thank you. One question, it shows evaluation mode and will expire. Will my vmware cease to function after expiration.. or is there some kind of bypass of sorts? I see it shows on your video the evaluation mode warning. im having the same warning as well. thanks mate!
Hey! Sorry for the delay and thanks for the comment, much appreciated. So when I set it up I found out there was a free license that I could download from vmware. It worked but was super limited as far as features but it worked and now its been discontnued :( So to answer your question im not sure exactly what happens. I'm looking into switching to proxmox or something thats free and no real limitations for what i need.
Can you share roadmap for CCIE
I think this is what your looking for learningnetwork.cisco.com/s/cisco-certification-roadmaps?tabset-4acab=1
Thanks that is really clear
Hey thanks for watching 🙏
you are Legend !
Great
Thanks
Man I teared up for you this feel like a personal goal for me but I’m worry I found this so late in life
Thank you for watching and for the comment. It's never too late. If you want to do it and fully commit then I know you can do it.
very nice video!!. are you planning to add more ACI videos?
Hi thanks and yeah i’d like to. I only have the simulator so i cant test any data plane stuff but i want to create content around the logical pieces (tenant,epg,bd,ect) and automation.
@@NetworkEngineerPro Humble request to continue uploading more videos. your videos are simple, clear and to the point. 👌
@@ketanbarot806 thanks i appreciate it and will do!
What are your thoughts using AI to help gather notes and help put them together for you?
If you already have good notes I think AI like chat gpt can help organize or outline it nicely. Or come up with a cool template for you to use moving forward that yo. Def still come up with your own notes though, idk if its ready to create 100 percent accurate notes for topics yet.
❤❤ 🇵🇰 🇵🇰 🇵🇰
❤️
Some great storytelling skills. Kepts me interested from beginning to end.
Glad you liked it the video, thanks.
It seems expensive. In my opinion even it might be worth to study for it without giving exam (due to price) to improve skills and level
Its definitely not cheap but thats a good option as well. Either way you will get better for sure.
I got the VM Simulator running on my PC using virtual box. I can't ping the set IP address. I have configured the network as bridge and selected my wifi adapter and made sure it allowed all but still cant ping or connect to the GUI. Did someone already tried deploying the VM straight from their computer running virtual box or vmplayer? What config did you use to run. I got the version 6.0-6c Thanks.
Did you figure it out yet? I havent tried it in vm player but i’ll try it this weekend.
Straight to the point, nice post, Thank you!
Thanks a ton glad it was helpful. I'm creating workbook labs if you want to practice this one or try some others. www.networkengineerpro.com/labs/bgp-md5-authentication
you are much better than my lecturer
Thank you so much im glad it was helpful, where are you in your CCNA journey?
Hey Thanks man well explained
You’re welcome thanks for watching.
Need help adding Cisco CML IOL images to eve-ng. Any suggestion :? Thank you
Sure, did you follow this procedure? www.eve-ng.net/index.php/documentation/howtos/howto-add-cisco-iol-ios-on-linux/
@@NetworkEngineerPro Thanks for the response. I was not sure about the license part. I purchased CML and thought i could find the license I paid for. I thought i did not have to go to google and try and find a way to generate a license.
Do you want to use IOL images only? You can use the vios images following the regular procedure no license to worry about. If you want to use the IOL images let me know i can find a site that i used to generate a license. It has nothing to do with the cml license btw its just a python script you run once in eve-ng to get the iol images working.
Here try this it shows the complete process for adding iol images including generating the license. nocsma.wordpress.com/2019/02/24/how-to-add-cisco-iou-iol-to-eve-ng/
@@NetworkEngineerPro I guess i really do not need the IOU i can use the IOS. Thank you for your content I am new to the channel and looking forward to working on my CCIE Enterprise. Congratulations on getting yours!!
thank you so much really!!!
You're welcome thanks for watching.
just want to say this vid helped cement my understanding of passive interfacing! im glad there's another supplemental vid out there for more visual aspect
That's so great to hear it helped. Thank you for checking it out.
Rafael, thank you for your story brother. Your journey is so inspiring. Thank you for your service. I am happy that you got the most out of your time in. I just retired from the Army, and just made the decision to pursue the CCNP certification. No plans at this time to take that rough CCIE journey for now.
Hey thank you and thank you for your service. Congrats on retiring as well. That's awesome you're pursuing CCNP its a great cert. Are you going to use EVE-NG for labs or what do you have planned for that? Best of luck and look forward to you passing.
@@NetworkEngineerPro I know is going to be a long journey, but I am excited for it. I use GNS3, but after watching some of your videos I want to make the switch to CML. I am adding some RAM and Storage space to my server so I can have Proxmox run CML. I am waiting for a frame rack to show up to set it all up. Just bought the OCG book too.
Hello Rafael! When I type the unl wrappers...line it doesnt output any message like "check state" It just returns to prompt. Also I can add xrv9k router, but when I click start it do starts but the router stops (turn into grey) few seconds after. Anyone facing this can give me any help?
hey ! thats what i see when i do "fix permissions" is it going back to prompt. As long as there is no error displayed i think its okay. Hmm I've seen that before when running amd cpu and after switching to intel it worked. What kind of cpu do you have? Not saying thats the problem but just curious.
Late to the party but greattttttttttt video. Thanks you
Welcome!
Like the way you explain.
Thanks!
CCIE Security or Enterprise have worth where CCIE collaboration is useless. Advise to new students not to go with Collaboration.
Yea true i think collab would be my least favorite.
Just signed up, thanks for this.
Welcome.
Thank you so much this was perfect!
Thanks I appreciate the feedback. I should have more coming out next week.
Awesome!
Thanks!
@@NetworkEngineerProThanks to you! Funny thing is; I had a recent interview for a technical expert position. It went really well the WAN side, with the exception, of one weird BGP feature that I never heard of - happened to be the answer to the engineer’s question that he was stressing on. Apparently the answer happened to be the AS Override BGP feature. I don’t recall it being in the CCNP book where I studied from. So this got me really curious about the feature to read about and study. Then I heard about the allows-in feature and wondered what the difference was, till I came across these 2 videos. So thank you for that sir 😁
@@JKRowl Oh nice glad to hear it went well. Thanks for watching. Those are part of the workbook style labs im creating on networkengineerpro.com I should hopefully have a few more added in a week or two.
love the videos keep them coming!
Hey thanks for the feedback. Hoping to release new labs each month. If you want to try them out you can find them here www.networkengineerpro.com thanks!
Nice,Thanks
you are welcome!
Watching this after VMWARE decided to sell out and get rid of ESXI
Oh man, i cant believe they did that. Might have to try something new.
@@NetworkEngineerPro Yea I decided to go with Proxmox instead.
Awesome story man. I have been contemplating on staying on my networking career path to CCIE or jump into cloud certs.
hey thanks for checking it out. Both of those are great options for your career. You thinking of CCIE first then cloud certs ? I am creating "workbook style" practice labs in EVE-NG for the CCNP/CCIE topics. I started recently so it's a work in progress but if you want to try them out. here ya go. www.networkengineerpro.com
please link for cisco8000 router image
Hello Sir, wonderful walkthrough. I am planning your go for R630, but my concern is how much is the power consumption? Is it too much ?
Hi my friend. I will be honest i dont know how much power it consumes. For me, i dont keep it on 24/7. When its not being used, its off.
Hi Rafael, I've tried to upload ios-xrv9000 using AMD as a processor. It does not work. I just receive an error message "acpi error"?
Hey! I know someone that had issues using AMD, it was related to getting images to fully boot. Switching to intel fixed it. looks like some AMD chips are supported, not sure what you have. EVE-NG CE and PE Supported platforms and systems: Intel CPU VT-x/EPT One of the following: Ubuntu Focal Fossa 20.04.X LTS 64bit Server as OS for EVE. VMware ESXi 6.7 or later VMware Workstation 15.0 or later VMware Fusion 8 or later VMware Player 15.0 or later Google Cloud platform VM AMD Ryzen 3900, the newer AMD EPYC should work as well. Please consult to EVE support for CPU tune before use. Older series AMD can have issues
good one
Thanks
Very well organized, keep em coming!
Thank you! Will do!
Nice one! Waiting to get access to your labs (:
Hey thanks! The first lab is this one, I want to knock out some BGP labs first. It should be available on networkengineerpro.com right now. I'm kind of testing the flow of things. Check it out and let me know if you run into any issues. You are able to view everything but to download the lab file and access the discussion for support you need to register (free). I appreciate any feedback as it will help me make it better in the future. It's a work in progress but the plan is to drop new labs each month, hope you find it helpful. Thanks!
I hope you answer me about the passive-interface: if I configure a passive-interface LAN network and disable the receive of a hello packet, why still send a hello packet? It should be stop send it hello packet.
Hi, im happy to answer. Paasive interface prevents that interface from forming neighbor relationships by not sending out any hello packets and discarding received hello packets.
I'm getting this error: PHP Fatal error: The encoded file /opt/unetlab/wrappers/unl_wrapper has expired. in Unknown on line 0
Interesting, at what point in the process Did this happen?
@@NetworkEngineerPro when I pasted the fix permissions command. I think it had something with the version of EVE-NG I’ve downloaded initially, because trying a second time with the one downloaded from official website it worked !
oh awesome, glad to hear its working now. What kind of labs are you interested in doing?@@ershadramezani6716
@@NetworkEngineerPro I’m currently preparing for the CCNP ENCOR exam and focusing on routing labs. I was using CML, but having access to EVE-NG as well is great. Thank you!
No problem. I am working on free workbook style routing labs for the CCNP/CCIE in EVE-NG. its coming soon but If you want more info check out my website www.networkengineerpro.com , it will be a work in progress but if your interested you can get notified there, first one should be coming later this month. @@ershadramezani6716
Great explanation and great content! Taking the CCNA exam soon and this makes it easier to understand!
Thanks so much for the feedback and thanks for watching. Best of luck on your exam , go and crush it!
Very nice
Thanks
Is it valid for all code versions?
It’s been available for a while i think. I wanna say since 3.x but not 100 percent sure.
Any day you write a book, I am buying it immediately. You are very good instructor - you break down complex things to simple and easy to understand. Thank you.
Wow thank you so much it really means a lot. Im very glad you found it helpful. I am in the process of creating cisco “workbook style” labs on eve-ng. If you want to check info on that and sign up for notifications its on my website networkengineerpro.com Thanks again have a great day!
Is this way of downloading ESXi still valid?
Looks like its not free anymore :(
@@NetworkEngineerPro yea /: I found out
Thank you for very clear video. I do have a question. I have lic for CML, image available in qcow2 format. I see different versions of this on CML based upon CML releases, in non-ISO format. Others that state you should install this image as ISO then convert. Do you know if this was legacy issue meaning they downloaded via CCO and CML was not yet offering. Video dates range from 3 years ago up until last few months. Not sure if there is a need or not to use ISO version.
Hey! thanks for watching and sorry for the delay. I haven't heard of any issues like that. So far I haven't had any problems using CSR's as qcow images in EVE straight from CML. I wouldn't worry about converting.
hi, I have watched some of your EVE-NG videos, I just want to ask.. If I purchased CML once, do I have those images for life that I can put in EVE-NG? I can't really keep subscribing because I don't have that kind of money. Thank you very much
Hi, yes once you buy cml you get a separate file that has all the device images. Those never expire. They work great in eve-ng!
Your videos are quite engaging and explain things in a very practical sense. I've stumbled across them a few times while studying. Please keep making more. :)
Thanks! That’s very motivating to hear. Glad you found them helpful. I will be working on some new content soon stay tuned!
Hey! Do you have the same problem, that when you try to reload the router with the "reload" command, it just crashes? I mean it gets stuck in the cli. I always have to stop and start the node instead. That was important for activating the proper licenses.
Hey, I don't remember having that problem in my lab. What version are you using?
Thanks a lot for information Mr🙏
Always welcome!