07-16-2007 08:24 AM - edited 03-05-2019 05:19 PM
I am configuring a trunk port to a VMWare ESX server. I have had problems with virtualization on AIX servers bleed STP BPDU's across the hypervisor through a redundant link thereby causing a bridging loop. I want to protect myself from this same thing occurring with this ESX server. Any thoughts on whether this is going to do it or possibly better ways to do it?
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 101,102
switchport mode trunk
no ip address
speed 1000
duplex full
no cdp enable
spanning-tree portfast trunk
spanning-tree bpduguard
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07-16-2007 08:34 AM
I really dont know the topology you have but based on the description above the "spanning-tree portfast trunk" and "bpduguard" should help you to achieve what you are looking for. You have done the correct configuration on the ports. Please see the link below for more info:
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12235se/cr1/cli3.htm#wp1946989
HTH,Please rate if it does.
-amit singh
07-16-2007 08:34 AM
I really dont know the topology you have but based on the description above the "spanning-tree portfast trunk" and "bpduguard" should help you to achieve what you are looking for. You have done the correct configuration on the ports. Please see the link below for more info:
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12235se/cr1/cli3.htm#wp1946989
HTH,Please rate if it does.
-amit singh
07-16-2007 08:36 AM
Your configuration is going to shut down the link as soon as a bpdu is received. That is probably fine if you never expect a bpdu (which is usually the case on a link to a server).
Now, I would just point that the bpdu is not the source of the loop. It's just an indicator that you have some unexpected bridging on the port.
If you had some bleeding of bpdus between your uplink, you probably also had a bleeding of user traffic -> and that's the loop. Looping back the bpdus will actually result in the spanning tree starting to block some ports (if you are running it on the path covered by the loop).
Regards,
Francois
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