Cisco 3750X RSTP sending BPDU Terminal Monitor Output

[mattrung01]

I am getting the below output from my terminal monitor and am having a hard time trying to figure out what it means. The ports that this is configured on have BPDUguard and portfast enabled. It is happening on every connected port on the switch. Any help would be appreciated. There are no switches connected to any of these ports. Thanks.

*Mar  2 19:51:28.999: RSTP(172): sending BPDU out Gi1/0/3
*Mar  2 19:51:28.999: STP SW: TX: 0180.c200.0000<-80e0.1dc3.1083 type/len 0027
*Mar  2 19:51:28.999:     encap SAP linktype ieee-st vlan 172 len 60 on v172 Gi1                                                                                                                                                             /0/3
*Mar  2 19:51:28.999:     42 42 03 SPAN
*Mar  2 19:51:28.999:     CFG P:0000 V:02 T:02 F:3C R:20AC 80e0.1dc3.1080 000000                                                                                                                                                             00
*Mar  2 19:51:28.999:     B:20AC 80e0.1dc3.1080 80.03 A:0000 M:1400 H:0200 F:0F0                                                                                                                                                             0
*Mar  2 19:51:28.999: RSTP(172): sending BPDU out Gi1/0/4
*Mar  2 19:51:28.999: STP SW: TX: 0180.c200.0000<-80e0.1dc3.1084 type/len 0027
*Mar  2 19:51:28.999:     encap SAP linktype ieee-st vlan 172 len 60 on v172 Gi1                                                                                                                                                             /0/4
*Mar  2 19:51:28.999:     42 42 03 SPAN
*Mar  2 19:51:28.999:     CFG P:0000 V:02 T:02 F:3C R:20AC 80e0.1dc3.1080 000000                                                                                                                                                             00
*Mar  2 19:51:28.999:     B:20AC 80e0.1dc3.1080 80.04 A:0000 M:1400 H:0200 F:0F0                                                                                                                                                             0
*Mar  2 19:51:28.999: RSTP(172): sending BPDU out Gi1/0/5
*Mar  2 19:51:28.999: STP SW: TX: 0180.c200.0000<-80e0.1dc3.1085 type/len 0027
*Mar  2 19:51:28.999:     encap SAP linktype ieee-st vlan 172 len 60 on v172 Gi1                                                                                                                                                             /0/5
*Mar  2 19:51:28.999:     42 42 03 SPAN
*Mar  2 19:51:28.999:     CFG P:0000 V:02 T:02 F:3C R:20AC 80e0.1dc3.1080 000000                                                                                                                                                             00
*Mar  2 19:51:28.999:     B:20AC 80e0.1dc3.1080 80.05 A:0000 M:1400 H:0200 F:0F0                                                                                                                                                             0
*Mar  2 19:51:28.999: RSTP(172): sending BPDU out Gi1/0/6
*Mar  2 19:51:28.999: STP SW: TX: 0180.c200.0000<-80e0.1dc3.1086 type/len 0027
*Mar  2 19:51:28.999:     encap SAP linktype ieee-st vlan 172 len 60 on v172 Gi1                                                                                                                                                             /0/6
*Mar  2 19:51:28.999:     42 42 03 SPAN
*Mar  2 19:51:28.999:     CFG P:0000 V:02 T:02 F:3C R:20AC 80e0.1dc3.1080 000000                                                                                                                                                             00
*Mar  2 19:51:28.999:     B:20AC 80e0.1dc3.1080 80.06 A:0000 M:1400 H:0200 F:0F0                                                                                                                                                             0
*Mar  2 19:51:28.999: RSTP(172): sending BPDU out Gi1/0/7
*Mar  2 19:51:28.999: STP SW: TX: 0180.c200.0000<-80e0.1dc3.1087 type/len 0027
*Mar  2 19:51:28.999:     encap SAP linktype ieee-st vlan 172 len 60 on v172 Gi1                                                                                                                                                             /0/7
*Mar  2 19:51:28.999:     42 42 03 SPAN
*Mar  2 19:51:28.999:     CFG P:0000 V:02 T:02 F:3C R:20AC 80e0.1dc3.1080 000000                                                                                                                                                             00
*Mar  2 19:51:28.999:     B:20AC 80e0.1dc3.1080 80.07 A:0000 M:1400 H:0200 F:0F0 

[Peter Paluch]

Hi,

These debugs are absolutely normal and correct. Even ports configured as PortFast ports and protected with BPDU Guard continue to send BPDUs, and this is exactly what the debugs are saying. The only ports that would not be sending out BPDUs would be ports configured with BPDU Filter. However, you are most probably not interested in that feature.

PortFast and/or BPDU Guard-enabled ports must continue sending out BPDUs because even though these ports are considered to be edge ports, there is no guarantee that some user will cause a loop. Such a loop must be detectable, which is why BPDUs must continue being sent out even on edge ports.

Best regards,
Peter

[mattrung01]

Thank you, is there a way to filter this out so I only see messages for link up down, etc.

[Peter Paluch]

Hi,

I suppose you want to simply deactivate the debugging that is running. To do that, simply enter the undebug all command in the privileged EXEC mode.

Best regards,
Peter