Root bridge

Say you had the following switches:

A - - - - - - B - - - - - - - C

Switch C is the root, would switch A receive hello bpdu's from C? There is no direct connection between A and C.

Find more posts tagged with

SAVE $250 on Your CISCO Boot Camp — Use Code "EXAM26"

Exclusively for TechExams members for Infosec Boot Camps starting before April 30, 2026

View CISCO Boot Camps

Comments

tech-airman

Mikdilly wrote:

Say you had the following switches:

A - - - - - - B - - - - - - - C

Switch C is the root, would switch A receive hello bpdu's from C? There is no direct connection between A and C.

Mikdilly,

If Switch C is the root switch, what type of switch is Switch B?

Mikdilly

Designated bridge

LOkrasa

I believe the answer is no. Hello BPDUs are only sent by a bridge to its neighbors and are not forwarded on to other bridges.

remyforbes777

It would receive it via the designated bridge.

Mikdilly

LOkrasa wrote:

I believe the answer is no. Hello BPDUs are only sent by a bridge to its neighbors and are not forwarded on to other bridges.

Cisco press ICND says they are forwarded. I should of checked the book before making the posting. Sorry

Netstudent

Also note that the root bidge does initiate the flow of BPDU's with a cost of 0. As the BPDU's go from switch to switch, the costs will be added at each egress port. Also all switches base their hello and max age timers based on the root bridge.

Mikdilly

Would A or B create mac-address-table entries based on the received bpdu's from C?

mikej412

No

Stop drinking while studying and focus on your book!

Mikdilly

Drinking is what inspires all of these wonderful questions. (hic)