James Gosnold wrote:
> 
> Just going through the Cisco Press book in preperation for the
> CCNP remote access exam, one thing cropped up on the section
> about custom queuing that confused me.
> 
> The book refers to Queue 0 which is the system queue and what
> traffic is serviced by this queue. One thing stuck out to me,
> namely 'Spanning Tree Keepalives'. Now I thought Spanning Tree
> was a Layer 2 technology designed to prevent loops on bridges
> and switches and therefore wouldn't cross a router anyway?
> Anybody care to shed any light?

You are generally right. But it's pretty easy to turn a router into a bridge:

bridge 1 protocol ieee
interface ethernet 0
bridge-group 1
interface ethernet 1
bridge-group 1

Then you would want Spanning Tree Bridge Protocol Data Unit (BPDU)
configuration and topology notification change frames to travel through the
router as quickly as possible, so I can believe that they are put in Queue
0, if they need queuing.

_______________________________

Priscilla Oppenheimer
www.troubleshootingnetworks.com
www.priscilla.com

> 
> Thanks, James.




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