This is a config not set by myself and what is bothering me most is the last line. "spanning-tree bpduguard enable". This setting puts another AP in "err-disable" mode (not this one).
286229: Nov 6 10:59:39.288 CET: %SPANTREE-5-TOPOTRAP: Topology Change Trap for vlan 1 286233: Nov 6 11:01:45.872 CET: %SPANTREE-2-BLOCK_BPDUGUARD: Received BPDU on port Fa0/3 with BPDU Guard enabled. Disabling port. 286234: Nov 6 11:01:45.872 CET: %PM-4-ERR_DISABLE: bpduguard error detected on Fa0/3, putting Fa0/3 in err-disable state 286235: Nov 6 11:01:46.896 CET: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed state to down 286236: Nov 6 11:01:47.894 CET: %LINK-3-UPDOWN: Interface FastEthernet0/3, changed state to down
So I disabled "spanning-tree bpduguard". Problem solved. BUT, didn't I disabled an important anti-loop rule here? Although the network is still running fine. And the other AP's have this enabled, but aren't going into "err disable".
This is a trunk port, maybe this rule is more applied on access ports?
I never enable bpdu guard on AP switchports. Primarily because our business relies heavily on APs and I don't want something accidentally connecting to it that could start sending bpdus in some way. That being said, is there another AP that's in bridge mode or is this AP in bridge that could be receiving a bpdu from the other switchport? That's the only thing off the top of my head that could cause this.
Yes, I also avoid putting bpdu guard on trunks unless I know it's a port for a host and a phone.
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