Stopping Spanning Tree broadcasts from a 3560 switch.

Posted on 2007-11-28
Last Modified: 2012-08-13
There is only 2 switches. Spanning tree is not configured.. but when monitoring traffic, i keep seeing these... and there are a ton of them..
79      34.081723      Cisco_1c:be:8c      Spanning-tree-(for-bridges)_00      STP      Conf. Root = 32772/00:1b:54:1c:be:80  Cost = 0  Port = 0x800c
80      36.086681      Cisco_1c:be:8c      Spanning-tree-(for-bridges)_00      STP      Conf. Root = 32772/00:1b:54:1c:be:80  Cost = 0  Port = 0x800c
95      53.814725      Cisco_1c:be:8c      Cisco_1c:be:8c      LOOP      Reply

How do i turn these off?
Question by:jaysonfranklin
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
LVL 21

Expert Comment

ID: 20369449
on the particular interface type: spanning-tree bpdufilter enable
this command will disable broadcasting of bpdu packets from this interface and will filter out all incoming bpdu packets

conf t
interface gi1/1
spanning-tree bpdufilter enable

Author Comment

ID: 20369549
do I do that on all the physical interfaces or just the vlan interfaces?

Author Comment

ID: 20369570
i just did int range 0-52

im still getting this one though..

389      20.083187      Cisco_1c:be:8c      Cisco_1c:be:8c      LOOP      Reply

what is this? im assuming i need to do that for all the int's on SW2  or just doing it on the main one should be good?
Is Your DevOps Pipeline Leaking?

Is your CI/CD pipeline a hodge-podge of randomly connected tools? You’ve likely got a tool to fix one problem & then a different tool to fix another, resulting in a cluster of tools with overlapping functionality. Learn how to optimize your pipeline with Gartner's recommendations

LVL 21

Accepted Solution

from_exp earned 500 total points
ID: 20369577
on all active physical interfaces
use range command
conf t
interface range gi1/1 - 10
LVL 21

Expert Comment

ID: 20369648
it looks like cisco loop detection protocol.
it should funtion
LVL 50

Expert Comment

by:Don Johnston
ID: 20369839
They appear to be BPDU's. Without seeing the complete frame it's hard to say for sure.

Spanning tree is enabled by default of all Cisco switches. I REALLY don't recommend turning it off. The BPDU's aren't consuming much bandwidth and they'll prevent a layer 2 loop if a redundant link is ever connected.

Featured Post

What Is Transaction Monitoring and who needs it?

Synthetic Transaction Monitoring that you need for the day to day, which ensures your business website keeps running optimally, and that there is no downtime to impact your customer experience.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I have seen some questions on problems with SSH/telnet access to Cisco routers that may occur despite the fact that from a PC connected to your LAN, Internet connectivity is in place and users can access Internet sites without any issues.  There are…
How to set-up an On Demand, IPSec, Site to SIte, VPN from a Draytek Vigor Router to a Cyberoam UTM Appliance. A concise guide to the settings required on both devices
After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Suggested Courses

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question