asked on

Stopping Spanning Tree broadcasts from a 3560 switch.

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?

from_exp

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

example:
en
<password>
conf t
interface gi1/1
spanning-tree bpdufilter enable
end

jaysonfranklin

ASKER

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

jaysonfranklin

ASKER

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?

ASKER CERTIFIED SOLUTION

from_exp

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from_exp

it looks like cisco loop detection protocol.
it should funtion

Don Johnston

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.