[Last Call] Learn how to a build a cloud-first strategyRegister Now

  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 399
  • Last Modified:

STP question

I have two switches connected via crossover cable in my home lab (2924XLs). I disabled STP on both of them and everything is working fine. Is this because I barely have any traffic?  I thought I would get a loop. Wanted to see what happens.

Just did a sh log. The port that connects both switches is flapping. Is that a sign?
2 Solutions
You'll only get a loop if you have more than one connection betwen switches, llike:
S  --- S
W     W
I       I
T      T
C     C

Connection S---S and connection H---H could create a loop. Spanning tree will set one link to blocking, one link to forwarding. Break the forwading link and the blocking link will begin forwarding (after several seconds).

If you only have a single uplink between switches, then Spanning Tree literally has no function.
Don JohnstonInstructorCommented:
If the two switches are connected with a single cable, you don't have a loop so spanning-tree isn't neccessary. Now if you connect a second crossover between the two switches...

Just wait for a broadcast frame! ;-)

dissolvedAuthor Commented:
Oh, forgot about that second cross over :)

Thanks guys!

Featured Post

[Webinar] Cloud and Mobile-First Strategy

Maybe you’ve fully adopted the cloud since the beginning. Or maybe you started with on-prem resources but are pursuing a “cloud and mobile first” strategy. Getting to that end state has its challenges. Discover how to build out a 100% cloud and mobile IT strategy in this webinar.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now