FREE CCNA Lab 054: OSPF (Part 1: Single Area)

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In this free CCNA lab you will configure OSPF and alter the reference bandwidth and interface cost to change the routing decisions.
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#cisco #CCNA

[@JeremysITLab]

I hope you're enjoying the labs! If you want another great set of FREE packet tracer labs for the CCNA, check out Neil Anderson's lab guide here: jeremysitlab.com/ccna-lab-guide

[@ryand1520]

Excellent! You just brought it home for me! It is great to see the reference cost and bw cost in action! Overall: REFERENCE BW divided by INTERFACE BW = cost. In other words, 10000 divided by 1000 = 10. In other words, you can modify the auto-cost REFERENCE BW ( default 100 (Mbps) ) divided by the INTERFACE BW (which is decided by each interface speed (FastEthernet = 100 Mbps; Gigabit interfaces = 1000 Mbps; 10Gig interfaces = 10000). So, the cost will be different in each of your interfaces if they have different speeds. Conversely, you can also modify the INTERFACE BW speed for an inverse result. EIGRP has a more sophisticated formula, so the rules are different.

[@JeremysITLab]

Thanks for the great comment! You totally nailed it with your explanation.

[@sauvus]

Awesome! Still very relevant for my studies for 200-301. Thank you sir!

[@JeremysITLab]

Thank you! Yes, most of these labs are still totally relevant to the new exam.

[@lbowser88]

These labs are so helpful thank you so much!

[@mohammedafroz1993]

Hello Sir You are by far, one of the best teachers, I've ever come across. Near 4:35 of the video, you used /8 and /16 instead of /24. I somewhat understand the Inverse Mask. That it's opposite of Netmask, but how does that or any Interface still advertises a /24. I DON'T understand your reference "anything works as long as Interface Prefix falls within that range" & Prefix=Subnet Mask (Number of IP Address associated with that Subnetwork) ? & It looks for Interfaces within the range stated in the network command like 12.0.0.0 /24, and then Advertises the Network Prefix like 24 bit Network ID and 8 bit Hosts on those Interfaces ? No matter, what Subnet/Inverse Mask we give in the Network Command, it will advertise the Subnetwork mentioned in the Network Command, but will still only Advertise the Netmask like /24 that is Configured on the respective Interface. Did i get it right ? Please Clarify. Anyone from Comments Section is welcome to Clarify it as well. Thanks Great Videos. I love them.

[@JeremysITLab]

Hi Mohammed, The 'network' command tells the router to activate OSPF on interfaces which have an IP address in the specified range. For example, 'network 12.0.0.0 0.255.255.255 area 0' tells the router to activate OSPF on any interface with an IP address in range 12.0.0.0 - 12.255.255.255. However, once OSPF is activated on the interface, the actual network/mask configured on the interface will be advertised (12.0.0.0/24 in this case), regardless of the /8 configured in the 'network' command.

[@mohammedafroz1993]

@@JeremysITLab Thank You for the Quick Reply. It means a lot, Sir. I wanted to ask one more thing. Can we ask any Doubts regarding This Playlist or Only on the New 200-301 Playlist, because you are working on that one right now. Because in order to answer, you need to go through the Video and its Configurations and all that.... Whatever the answer, I am thankful for the Free Video Series. Your explainations are really good. Again, Thanks a lot Sir.

[@MrProTV]

@@JeremysITLab so what is the benefit from the activating in different interfaces range as long as it will be advertised all of the /24.

[@Jason-xe9vz]

Jeremy I like your labs. I have gone through the first five labs. I'm just curious, is there a way to download all the lab files for packet tracer, instead of downloading them one at a time with each video?

[@JeremysITLab]

Jason Huard Sure I’ll look into making a ZIP file of them.

[@Jason-xe9vz]

@@JeremysITLab thank you!!

[@glenntembo2693]

Informative guidelines

[@JeremysITLab]

Glenn Tembo Thank you!

[@JeremysITLab]

Jason Huard I’m at work now but I’ll try it out this evening.

[@noisehxbit2466]

which router supports fast ethernet and gig at the same time

[@rebelnaveen1117]

Hi Jeremy, Your labs are great! we use lower cost as a preferred route in ospf. for the 5th question we changed R1 g0/0 interface bandwidth to 10000 and we set reference band width to 10000, so the cost is 1, for int f1/0 the cost is 100. and the route preferred is via R2. can you please explain this

[@JeremysITLab]

In question five I set R1 G0/0’s cost to 10000, not its bandwidth

[@naveendevaraju8728]

Thank you

[@pratiknilugal]

Thank you

[@JeremysITLab]

You’re welcome! Thank you for your comment :)

[@pratiknilugal]

Hey Jeremy correct me if wrong at 13:09 when we do show up route after doing auto cost reference bandwidth so we are dividing 10000/10000 that should give us 1 so total cost from R1 to R3 via R4 should be 3 but it shows us 12 can u please explain how.

[@JeremysITLab]

Pratik Nilugal The cost is done per link, however I think packet tracer (or maybe it’s OSPF) takes some time for the updated costs to be shared. The reference cost is 10000, so I think it should be 10000/1000(Gigabitethernet)=10, + 10000/100(Fastethernet)=100, so 110. I’ll take a look at it on the weekend when I have some time at my computer.

[@pratiknilugal]

@@JeremysITLab thank you

[@JeremysITLab]

@@pratiknilugal Hi Pratik, I just did the lab again myself, and the cost from R1 to R3 via R4 is 111 this time. That's 10 for the GigabitEthernet link, 100 for the FastEthernet link, and it seems OSPF adds 1 for the loopback interface. The metrics are displayed incorrectly in this video, maybe because I didn't wait enough time for the network to converge!

[@10randhawas]

Does anyone know why he used a /32 subnet mask when the topology says its a /24?

[@JeremysITLab]

Are you talking about the loopback interfaces? They aren't written in the topology diagram, but the instruction say 'Configure a loopback address on each router (1.1.1.1 */32* for R1, 2.2.2.2 */32* for R2, etc.)

[@10randhawas]

@@JeremysITLab yep was referring to that, thanks just realised why.

[@hadjergr]

thank's

[@JeremysITLab]

Thanks for watching :)

[@dulcealeria2506]

Please teach how to draw also I'm newbie here

[@JeremysITLab]

Hello! Could you clarify your question?

[@dulcealeria2506]

Can you teach how you connect them??

[@AmirIKTech]

Everything is Expalained well but please be a little fast at talking you talk so dramatically while lots will get bored of following the series thanks Great Effort

[@JeremysITLab]

You can modify the speed of KZbin videos