Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Root Bridge Status Doubt!!!

HI

It's simple: A root switch has always all ports in non-blocking mode??

I mind, could be in blocking state a root Bridge Port??

Thanks.

6 REPLIES

Re: Root Bridge Status Doubt!!!

Hi,

All the root switch ports are designated ports.

HTH,

Mohammed Mahmoud.

New Member

Re: Root Bridge Status Doubt!!!

Thank you for you answer Mohamed, but could be one of them in blocking state mode by STP??

New Member

Re: Root Bridge Status Doubt!!!

Thank you for you answer Mohamed, but could be one of them in blocking state mode by STP??

c
New Member

Re: Root Bridge Status Doubt!!!

I guess it should be possible.What if we connect two ports of the root bridge using a crossover cable. It should block both the ports.

Cisco Employee

Re: Root Bridge Status Doubt!!!

Nope, it will still bock only one port using the Port ID parameter. The port with the lower ID will be in forwrading state and the other one will get block.

In a well desidged STP network, root ports will never be in blocking state. All the ports on a root bridge as designated ports representing a Lan segement connected to them and are in forwrading state always. Exception is the one mentioned above.

HTH,

-amit singh

Re: Root Bridge Status Doubt!!!

Hi Ladislao,

As Amit has stated in a well designed STP network all the root switch ports are designated, unless there is obviously something done wrong as the case stated above where 2 ports are cross-connected, which should never be a case in real life.

HTH,

Mohammed Mahmoud.

125
Views
4
Helpful
6
Replies