CCNP Switch: Loop Guard | Explained Simply!

In this part of the CCNP Switch series, we look at the STP Enhancement feature Loop Guard!
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[@papaul69]

Best and clearest explanation I've seen of this concept!

[@IPvZero]

Hey Papaul, thanks for the feedback! Really appreciate it! :)
-John

[@mohamadkhalil7632]

posted three years ago and my lecturers at uni still can't explain this stuff as well as you, you're a natural mate

[@IPvZero]

Thanks so much, Mohamad. I genuinely appreciate your kind words!
-John

[@AshTheThomas]

Excellent stuff man! This has just saved my sanity as to why LoopGuard is needed and covers it greatly

[@IPvZero]

Thanks so much, Ash! Really appreciate it :)
-John

[@Don-Carillo]

Best explanation i have come across. Subscribed thanks

[@remcokersten1174]

Very well explained! Thx.

[@danielschiffers9696]

Thanks for the explanation. Only one question this removes the redundant function of STP right? Because if Switch2 would fail there won't be a link anymore. Is this something were you would weigh of the pros and cons? Like no redundancy but less likely a loop?

[@AOSRoyal]

yo this is amazing. thanks

[@IPvZero]

Thanks AOSRoyal! Really glad you found it helpful!
-John

[@skeetabomb]

"Untafess Gegg ziddaw WAN" - Loov ett! ;P

[@ahmadel-deeb6827]

I dont get what will happen if we are enabling the loop guard, and the BPDU doesn't come because the link actually goes down , in this case the port will go to the inconsistent mode instead of going to the FWD state.and the traffic won't flow normally using this redundant link, am I missing something?

[@kurt5132081]

if the the link actually goes down, switch 3 Gi0/1 would still receive inferior BPDU's from switch 2 , there would not be a sudden loss of BPDU's therefore the port will not go into an inconsistent state but instead become a designated port

[@ahmadel-deeb6827]

@@kurt5132081 Thanks a lot Kurt, cheers ;)

[@TheKimfettig1]

@@kurt5132081 Mr. IPZero explained in the video above that only the Root Bridge (once elected) generates BPDUs, and other switches forward as a relay agent. Therfore in that circumstance SW 3 would not be receiving an inferior BPDU from SW2, it would only know that it is not receiving the Root's BPDU via relay ingress from that side of the topology. I beleive it is more of a "wigh the pros/cons" situation, i.e redunancy vs layer 2 loop

[@feelsoezy]

This has been moved back to the new CCNA