Route Precedence -- How does a Router choose a path when multiple paths exist?

[@PracticalNetworking]

Did you know you can use a *Cisco router to generate mock traffic* for lab or testing purposes? It uses a feature known as Cisco IP SLA, and I show you how to use it in this article: www.practicalnetworking.net/stand-alone/cisco-ip-sla-using-a-cisco-router-to-generate-traffic/

[@jibnathgautamhy1280]

Why did u used 0.0.0.0 as a wild card mask while it should be 0.255.255.255 I didn't get u either I ve to be new to this concept

[@PracticalNetworking]

Because the Network statement exists to match an Interface IP address. I'm considering making a video to explain this. Like this comment if you'd like to see that. Once an interface is matched, the Router will then advertise the Interface's entire network. I was using 0.0.0.0 to match the interface IP address exactly. I could have also used a /8 mask, or any mask which would have included the Interface IP.

[@karanvyas5155]

I don't understand why this man hasn't 1 Million subscribers, he 100 percent derserves it!

[@PracticalNetworking]

Thanks for the kind words. Still haven't figured out how to "crack the algorithm" or whatever to get more visibility. =).

[@sinade1]

1. Static route will replace EIGRP route because it has lower admin distance (1 < 90). Admin distance breaks the tie since the routes are both /24. 2. RIP route will be preferred over static route because of the longer mask (/25 more specific than /24). So the path through R2 is chosen.

[@sinade1]

The instructor knows the technology and how to deliver it. The best video I have seen so far on this subject!

[@PracticalNetworking]

Thanks for the kind words, Sinade =) I'm delighted that you enjoyed the video!

[@MohamoudFarah-fc3zh]

I've watched this video 2023-03--6 which is after 2 years when you was posted it, you're talent instructor who can make a complex tasks more easier. .

[@manikghosh5404]

The way u explain is awesome...lucky to found this gem...i can't stop going through all of your videos

[@PracticalNetworking]

Thank you =). Glad you enjoy them!

[@mutturajgoudar7676]

After watching this I am like in a WOW mood, very simple and straight forward explanation any layman(Beginner) can understand this complicated concept easily. Thank you and hats off.

[@PracticalNetworking]

So glad you enjoyed it, Mutturaj =). You're welcome!

[@mrcell61]

Wow! Really!!! This video is a work of art. It is a little over my head, but helped me so much to understand Administrative Distance. I am a Network+ student right now.

[@PracticalNetworking]

Glad you enjoyed it! Good luck with the net+!

[@EllencyOfficial]

Best network teacher hands down. So clear!

[@KeithBarker]

Great video! Thank you.

[@PracticalNetworking]

The legend himself! Thanks Keith! =)

[@rajasekaraninfotech]

Eigrp route will be deleted and in the routing table static route will be available for /24 and RIP will be available for /25. If we trace .129 it will use the RIP route.

[@IZeoClass]

I love you practical networking.

[@PracticalNetworking]

[@arshdeep1286]

no words for this explanation hats off.

[@PracticalNetworking]

Thank you =)

[@thilbala86]

Mind Blowing explanation boss...Mesmerized and my mind have taken a path to join your channel.

[@johnlloydbigmac]

Great video! I’m binging all your videos during this pandemic. Even though I’m a seasoned IT, I still review and get back to my Networking basics. Keep it up!

[@PracticalNetworking]

Nice =) I'm glad you enjoy this content. It's always good to review the basics =).

[@vladimirstupnitzky3694]

I encountered this in an interview! Thank you!

[@AlexCruz-mv1gj]

Wow, this was explained so well and super easy to understand. Thank you for this!

[@PracticalNetworking]

You're very welcome!

[@xunililak1674]

Nice job with concise message delivery, I have a hard time wondering why you don't have many many more views. I only wish I had super net powers and could help you market this channel because I could watch your content forever, even if such as this previous learned material! Thankyou and now looking for your next topic of interest!

[@xunililak1674]

LoL just caught my subnet term "Supernet" sentiment LoL ...super youtube/net powers rather, LoL

[@PracticalNetworking]

I too wish I knew what it would take to get more visibility. =). Thanks for the kind words!

[@krishnendubiswas5560]

Fantastic explantion Eddie. just simply awesome.

[@vladislavkaras491]

Thank you for the information! The Cisco's NetAcad did not quite explain it well! Again, thank you so much with those detailed examples!

[@theomidtabei]

Your explanations are so perfect

[@jeffarias3740]

Wow Wow finally get to understand this topic after months of reading a lot. Thank you you are the best. can you make another explaining how routers decide which protocol install in the routing table or they just will any protocol you put in there?

[@PracticalNetworking]

You're welcome! Routers will accept routes from any protocol you configure. There are some protocols that have special rules (BGP, namely) but for the most part, a Router will accept any route it can. And of course it will use the Route Precedence rules described in this video when receiving multiple, identical routes.

[@utkarshmishra1928]

Brilliant content and so succinctly explained. Thanks!

[@PracticalNetworking]

Glad you enjoyed it!

[@raybenavides7819]

Like Rajasekaran mentioned, the /24 route will be replaced with the lower admin distance static route. the /25 RIP route will take precedence since it's a more specific/higher netmask route.

[@MahananGogoi]

What a great demonstrations ! Thank you

[@PracticalNetworking]

You are welcome! Glad you enjoyed it =)

[@luiscapothead7109]

What an usefull video, thanks for uploading! Keep it up!

[@PracticalNetworking]

Thank you, Luisca =) Glad you liked it!

[@mallenieperumal4224]

Awesome, thank u

[@PracticalNetworking]

You're welcome, Mallenie.

[@ramaswamysubramanian1147]

Simply superb ...!!!!!

[@PracticalNetworking]

Thanks =) Glad you enjoyed it.

[@majiddehbi9186]

great tutos buddy do some more

[@PracticalNetworking]

Thanks, will do!

[@MrDavidson231984]

Good Content

[@asithjayawardhane]

Awesome explanation !!

[@PracticalNetworking]

Thank you, Asith. Glad you enjoyed it!

[@artemabramov7737]

Great videos, extremely clear!

[@PracticalNetworking]

Thank you! Glad you enjoyed it!

[@drgrockster]

really well explained, a nice video 👍

[@PracticalNetworking]

Glad you enjoyed it

[@souviksamanta8938]

very very nice example..I loved it. COuld you please make a video for BGP, DMVPN with pri HUB and Sec HUB with 1 spoke, also HSRPV6?

[@PracticalNetworking]

Thank you. BGP is on my list. The others... maybe I'll get around to them, but I don't imagine it will be any time soon =(. PS: You might enjoy this article I wrote on BGP: www.practicalnetworking.net/stand-alone/bgp-oldest-path/

[@hirenpanchal5476]

Eigrp route will delete and between static and Rip , rip will preferred due to route specific /25

[@haynej3]

Why does the EIGR route not get deleted when the RIP route gets added? The OSPF routes were deleted when better routes were introduced.

[@alittax]

11:30 How did you get it to advertise the /25 network in RIP? The interface on R1 to R2 is in a /25 subnet?

[@PracticalNetworking]

RIP doesn't do easy summarization, so if I recall I configured the network itself as a /25, and for OSPF and EIGRP I "summarized" the /25 into a /24. With RIP, I just let the /25 through without additional tweaking.

[@alittax]

@@PracticalNetworking I see, that's a very elegant solution. Thank you for sharing, and thank you for your awesome content as well! :) Have a nice weekend.

[@malexherron]

why does eigrp have a lower admin distance than ospf?

[@PracticalNetworking]

Admin Distances were essentially arbitrarily picked. Cisco had a large say, so rated their protocol (EIGRP) as "more trusted" than OSPF.

[@malexherron]

@@PracticalNetworking well that makes sense! thanks for the reply!

[@PracticalNetworking]

@@malexherron You're welcome!

[@rindu2909]

hello Sir. Can you share the video of the answer.thank you

[@PracticalNetworking]

Sure! Here you go: kzbin.info/www/bejne/pZzLoIKLrp6Arc0

[@sibakerokulafu8367]

great tutorial! however, im confused with the diagram and routing table. you have /25 on the diagram on r6 but on the routing table it shows /24 network.. was it the auto summary?and also /24 is what is on the diagram on the left segment but the routing table is showing /29 on the directly connected interfaces.. can you also provide the configuration for each router? thank you!

[@PracticalNetworking]

The network is a /25, but with R3/R4/R5 I am summarizing it as a /24 when forwarding to R1. I'm doing this so that later on I can show that a more specific /25 takes precedence over the less specific /24. The /29's are simply the links between the Routers. As for the configuration files... the GNS3 project I used for this demonstration is stored on another computer. If this comment gets enough likes, I'll dig up the old computer to find the GNS3 project and post the Router configurations somewhere. Otherwise, I'm glad you enjoyed the video =).

[@sibakerokulafu8367]

@@PracticalNetworking thank you.. im trying to replicate your topology in my packet tracer lab. i managed to get the RIP routing entry as /25 on R1. however, in EIGRP it is being advertised as /25 as well in R1 replacing my RIP route entry to the 9.9.9.128/25 network. i dont know how to advertise it as /24,, could you please teach me thanks

[@sibakerokulafu8367]

i figured it out. on ospf for internal routes. you can use area range while with eigrp. you should go into interface config mode facing the router you want to adverstise the summarized route and type in ip summary-address eigrp . same with rip but omit the as number

[@PracticalNetworking]

@@sibakerokulafu8367 Sorry, I just now saw this comment. (YT's doesn't notify on replies to replies). RIP did not summarize. RIP sent the /25 as it was. Only EIGRP and OSPF sent the /24. As far as I know, you can not summarize with RIP.

[@sandeepabbadi1577]

how to change route path ???

[@ahajeid]

Can you please provide the configs from each router so I can replicate in my lab?

[@tahersadeghi6773]

What do you mean by specificity?

[@PracticalNetworking]

Routes for more specific networks. For instance, a /29 route is more specific than a /24 route because a /29 is 8 IP address and a /24 is 256 IP addresses, so the /29 is more specific. This is also called "Longest Prefix Match" but I feel that is a confusing term. It comes from looking at a Subnet Mask in Binary to find the 1's (i.e., the "prefix") and whichever has more 1's has priority. The example above... /29 has 29 ones, and a /24 has 24 ones, hence the /29 is the longest prefix match.

[@michaeljewell5650]

I'm not military affliction but they did this to music

[@argav625]

I don't understand a thing about this tutorial. Better show IP address for each router interfaces.

[@danield7036]

Man, I have to always replay things because I am not good at picking things up the first time but with all that swallowing you're doing I can't watch this video. It's super cringe and I'm usually not one to complain but it seems like its on purpose which is even worse to me.