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Turn off BPDU on a switchport

Posted on 2011-10-24
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Last Modified: 2012-05-12
I have a 3548 that does not support the command spanning-tree bpdufilter enable

If the 3548 is installed and connected to an upstream switch that is running bpduguard then the port will be shut down.

I don't believe that switchport mode access will prevent bpdus from being sent out the port.

Is there another way to stop bpdus being sent out a port on the 3548 other than the unavailable command of spanning-tree bpdufilter enable

I have to get management approval and write a change request to turn off bpduguard on the production switch and that will take too much time.

Could I just turn off stp?

This is a temp switch to allow techs to hook up multiple computers for configuration.

STP off could cause a loop if they plug into another switch which could be very bad.
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Question by:Dragon0x40
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by:rochey2009
ID: 37020743
Hi,

Which version of IOS are you running?

http://www.cisco.com/en/US/docs/switches/lan/catalyst2900xl_3500xl/release12.0_5_wc7/2900-3500xl/ol256203.html#wp687917

The link suggests bpdu filtering is allowed on this switch.

Maybe your IOS needs upgrading.
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by:Dragon0x40
ID: 37021010
You may be correct that an IOS upgrade or a different switch would allow me to use the bpdu filter command.

My question is if you do not have the bpdu filter command is the only way to not send out bpdus is to turn spanning-tree off?
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by:rochey2009
ID: 37021123
You may be able to configure a mac access-list and block the BPDU's that way. I'm not sure if you can do an out bound access-list though.
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rochey2009 earned 2000 total points
ID: 37021141
other than that, you could disable the spanning-tree for the VLAN, but there are risks associated with that.
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