STP Exercise #1 Solution

[chellerik]

im confused about root bridge id... 4th tie breaker... but twas good.. i understand it more with your video

thanks

[VEG4able]

talking about designated ports, you have 4 tie breakers! But what do you mean with "Root Bridge ID"? I'm confused because you use the Bridge ID (BID) as the 3rd tie breaker o.Ô please help me out

[lupineye]

Thanks! It have been 10 years since I learned network in college. I understand very clearly. Perfect!

[Calafan87]

oh and how do you add mac addresses with a lot of numbers and letters i think i know but just to be sure for my second time around at the ccna

[aconaway1]

@Calafan87 The switches come with built-in MAC addresses, so there's no need to add any. :)

[Calafan87]

nice vid man failed my ccna test today :-( ran out of time.

[donnicos]

This really helped me understand the rationale behind the blocking of ports. Good work!

[rameunknown]

Need to say that that was a real good job with good explanation. The topology and the stuffs were really good.

Further can you please post additional videos on the convergence between the various flavours or spanning tree and the port states and roles.

Please provide us a good training on MSTP.

Once again that you for that piece of video

[carnevil09]

Yes!!!

I have a strong understand of small diagrams with STP; three/two switches. I even use CBT nuggets. When I went to take I ICND2, they gave me a scenario with 5/6 switches. I am almost positive I got it wrong...I failed by 4 points.

This should have me prepared for any other complex scenarios they try to throw at me again. Thanks for the simple explanation and large diagram.

[zardosht111]

thanx that was very clear

[sirchristoph]

this is SO much better explained than ICND2 Cisco Press STP chapter!!

[dameskid]

@sirchristoph

Hear exactly what your saying mate, i have read the ICND2 cisco press chapter several times but still cannot grasp it....

[palashmitra000]

Boss, nice tutorial.

Thanks and grateful to u.

[keebler5846]

Very nice .. thanks for sharing!!1

[keebler5846]

Excellent video .. helped me alot!!

[johnsujith12]

Thanks for this vid.... very helpful !!

[hecticCow]

Hey nice vid, I have a question though. If i am on your switch A (The non root bridge) and do the command show spanning tree. How can I tell just from that print out which switch is the root bridge.

Scenario is I have the topology but only access to switch A. thx

[aconaway1]

@hecticCow The first few lines of the output of "show spanning-tree" will show the MAC address of the root bridge. You can't get a name or IP from that output, though, so you'll need to check documentation or do a layer-2 trace (show mac address-table xxxx.xxxx.xxxx) to find it.

[aconaway1]

Thanks, Comblues2000. I found that out right after I published the video. :)

[Comblues2000]

To set the path cost of the interface for STP calculations, use the spanning-tree cost command. Use the no form of this command to revert to the default settings.

spanning-tree cost cost

no spanning-tree cost