error connection with spanninjg tree

Hi Daniel,

Thanks for your reply.

>As devices are added and removed from the network, it is not uncommon to see topology changes occur. This can cause ports to briefly transition like you see here.

OK. We almost never make any change but logs appears all the time.

I will try to provide more informations about our situation.

We use 4 stacked N1548P named 'vox-switch20'
It is uplinked to our router on port Gi1/0/3 and 2 other switches (NetGear GS724TPS) on ports Gi1/0/33 and Gi1/0/35.
Here is a graphic representation:

router
          |
          |
vox-switch20 (stack)
|                     |
|                     |
netgear       netgear

As you can see our network topology doesn't have any loop. We considered disabling STP globally but it seems to be not recommended.
All switches were configured with RSTP default values until we noticed that STP root election was randomly happening. So we gave 'vox-switch20' priority 4096 to make it root.
Since this new priority set on 'vox-switch20', these logs appeared and we have over 80K occurences per day:

Jul 21 11:51:24 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394603 %% Gi1/0/3 is transitioned from the Forwarding state to the Blocking state in instance 0
Jul 21 11:51:24 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394604 %% Gi1/0/3 is transitioned from the Learning state to the Forwarding state in instance 0
Jul 21 11:51:26 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394605 %% Gi1/0/3 is transitioned from the Forwarding state to the Blocking state in instance 0
Jul 21 11:51:26 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394606 %% Gi1/0/3 is transitioned from the Learning state to the Forwarding state in instance 0
Jul 21 11:51:28 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394610 %% Gi1/0/3 is transitioned from the Forwarding state to the Blocking state in instance 0
Jul 21 11:51:28 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394611 %% Gi1/0/3 is transitioned from the Learning state to the Forwarding state in instance 0
Jul 21 11:51:30 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394621 %% Gi1/0/3 is transitioned from the Forwarding state to the Blocking state in instance 0
Jul 21 11:51:30 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394622 %% Gi1/0/3 is transitioned from the Learning state to the Forwarding state in instance 0
Jul 21 11:51:32 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394626 %% Gi1/0/3 is transitioned from the Forwarding state to the Blocking state in instance 0
Jul 21 11:51:32 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394627 %% Gi1/0/3 is transitioned from the Learning state to the Forwarding state in instance 0
Jul 21 11:51:34 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394628 %% Gi1/0/3 is transitioned from the Forwarding state to the Blocking state in instance 0
Jul 21 11:51:34 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394629 %% Gi1/0/3 is transitioned from the Learning state to the Forwarding state in instance 0
Jul 21 11:51:36 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394630 %% Gi1/0/3 is transitioned from the Forwarding state to the Blocking state in instance 0
Jul 21 11:51:36 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394631 %% Gi1/0/3 is transitioned from the Learning state to the Forwarding state in instance 0
Jul 21 11:51:38 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394636 %% Gi1/0/3 is transitioned from the Forwarding state to the Blocking state in instance 0
Jul 21 11:51:38 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394637 %% Gi1/0/3 is transitioned from the Learning state to the Forwarding state in instance 0
Jul 21 11:51:40 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394640 %% Gi1/0/3 is transitioned from the Forwarding state to the Blocking state in instance 0
Jul 21 11:51:40 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394641 %% Gi1/0/3 is transitioned from the Learning state to the Forwarding state in instance 0
Jul 21 11:51:42 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394645 %% Gi1/0/3 is transitioned from the Forwarding state to the Blocking state in instance 0
Jul 21 11:51:42 vox-switch20-1 TRAPMGR[trapTask]: traputil.c(721) 6394646 %% Gi1/0/3 is transitioned from the Learning state to the Forwarding state in instance 0

We tried to activate stp portfast on Gi1/0/3 but it didn't help.

Why this port (uplink to router) is flooding with STP transitions?
Gi1/0/3 is configured as access port, is this okay?
Did we miss a configuration: mstp? guard loop? bpdu filter?

Here is some configuration that might help to understand:

vox-switch20(config)#show running-config

!Current Configuration:
!System Description "Dell Networking N1548P, 6.3.2.3, Linux 3.6.5"
!System Software Version 6.3.2.3
!
configure
vlan 10,20,30,40
exit
vlan 10
name "data"
exit
vlan 20
name "voip"
exit
vlan 30
name "fbx"
exit
vlan 40
name "cam"
exit
hostname "vox-switch20"
clock summer-time recurring EU
clock timezone 1 minutes 0 zone "CEST"
stack
member 1 4 ! N1548P
member 2 4 ! N1548P
member 3 4 ! N1548P
member 4 4 ! N1548P
exit
boot auto-copy-sw
interface vlan 1
ip address dhcp
exit
interface vlan 10
ip address 192.168.42.70 255.255.254.0
exit
interface vlan 20
ip address 192.168.1.70 255.255.255.0
exit
interface vlan 30
exit
interface vlan 40
ip address 10.1.1.170 255.255.255.0
exit
ip default-gateway 192.168.42.2
spanning-tree priority 4096
application install SupportAssist auto-restart start-on-boot
application install hiveagent start-on-boot
!
interface Gi1/0/1
switchport access vlan 10
exit
!
interface Gi1/0/2
switchport access vlan 10
exit
!
interface Gi1/0/3
switchport access vlan 10
exit
!
interface Gi1/0/4
switchport access vlan 20
exit
!
interface Gi1/0/5
switchport access vlan 10
exit
!
interface Gi1/0/6
switchport access vlan 10
exit
!
interface Gi1/0/7
switchport access vlan 20
exit
!
interface Gi1/0/8
switchport access vlan 20
exit
!
interface Gi1/0/9
switchport access vlan 10
exit
!
interface Gi1/0/10
switchport access vlan 10
exit
!
interface Gi1/0/11
switchport access vlan 20
exit
!
interface Gi1/0/12
switchport access vlan 20
exit
!
interface Gi1/0/13
switchport access vlan 30
exit
!
interface Gi1/0/14
switchport access vlan 20
exit
!
interface Gi1/0/15
switchport access vlan 40
exit
!
interface Gi1/0/16
switchport access vlan 20
exit
!
interface Gi1/0/17
switchport access vlan 10
exit
!
interface Gi1/0/18
switchport access vlan 10
exit
!
interface Gi1/0/19
switchport access vlan 20
exit
!
interface Gi1/0/20
switchport access vlan 20
exit
!
interface Gi1/0/21
switchport access vlan 10
exit
!
interface Gi1/0/22
switchport access vlan 10
exit
!
interface Gi1/0/23
switchport access vlan 20
exit
!
interface Gi1/0/24
switchport access vlan 40
exit
!
interface Gi1/0/25
switchport access vlan 10
exit
!
interface Gi1/0/26
switchport access vlan 10
exit
!
interface Gi1/0/27
switchport access vlan 20
exit
!
interface Gi1/0/28
switchport access vlan 20
exit
!
interface Gi1/0/29
switchport access vlan 10
exit
!
interface Gi1/0/30
switchport access vlan 20
exit
!
interface Gi1/0/31
switchport access vlan 20
exit
!
interface Gi1/0/32
switchport access vlan 20
exit
!
interface Gi1/0/33
switchport mode trunk
switchport trunk allowed vlan 10,20,30,40
exit
!
interface Gi1/0/34
switchport access vlan 20
exit
!
interface Gi1/0/35
switchport mode trunk
switchport trunk allowed vlan 10,20,30,40
exit
!
interface Gi1/0/36
switchport access vlan 20
exit
!
interface Gi1/0/37
switchport access vlan 10
exit
!
interface Gi1/0/38
switchport access vlan 10
exit
!
interface Gi1/0/39
switchport access vlan 20
exit
!
interface Gi1/0/40
switchport access vlan 20
exit
--More-- or (q)uit

vox-switch20(config)#show spanning-tree

Spanning Tree: Enabled - BPDU Flooding: Disabled - Portfast BPDU Filtering: Disabled
Mode: rstp
CST Regional Root: 10:00:F4:8E:38:4F:0D:1A
Regional Root Path Cost: 0
ROOT ID
Priority 4096
Address F48E.384F.0D1A
This Switch is the Root.
Hello Time: 2s Max Age: 20s Forward Delay: 15s Transmit Hold Count: 6s
Bridge Max Hops: 20
Interfaces

Name State Prio.Nbr Cost Sts Role Restricted
--------- -------- --------- --------- ---- ----- ----------
Gi1/0/1 Enabled 128.1 20000 FWD Desg No
Gi1/0/2 Enabled 128.2 20000 FWD Desg No
Gi1/0/3 Enabled 128.3 20000 FWD Desg No
Gi1/0/4 Enabled 128.4 200000 FWD Desg No
Gi1/0/5 Enabled 128.5 20000 FWD Desg No
Gi1/0/6 Enabled 128.6 20000 FWD Desg No
Gi1/0/7 Enabled 128.7 0 DIS Disb No
Gi1/0/8 Enabled 128.8 200000 FWD Desg No
Gi1/0/9 Enabled 128.9 20000 FWD Desg No
Gi1/0/10 Enabled 128.10 20000 FWD Desg No
Gi1/0/11 Enabled 128.11 20000 FWD Desg No
Gi1/0/12 Enabled 128.12 200000 FWD Desg No
Gi1/0/13 Enabled 128.13 20000 FWD Desg No
Gi1/0/14 Enabled 128.14 0 DIS Disb No
Gi1/0/15 Enabled 128.15 0 DIS Disb No
Gi1/0/16 Enabled 128.16 200000 FWD Desg No
Gi1/0/17 Enabled 128.17 20000 FWD Desg No
Gi1/0/18 Enabled 128.18 20000 FWD Desg No
Gi1/0/19 Enabled 128.19 200000 FWD Desg No
Gi1/0/20 Enabled 128.20 200000 FWD Desg No
Gi1/0/21 Enabled 128.21 20000 FWD Desg No
Gi1/0/22 Enabled 128.22 20000 FWD Desg No
Gi1/0/23 Enabled 128.23 200000 FWD Desg No
Gi1/0/24 Enabled 128.24 0 DIS Disb No
Gi1/0/25 Enabled 128.25 20000 FWD Desg No
Gi1/0/26 Enabled 128.26 20000 FWD Desg No
Gi1/0/27 Enabled 128.27 0 DIS Disb No
Gi1/0/28 Enabled 128.28 0 DIS Disb No
Gi1/0/29 Enabled 128.29 20000 FWD Desg No
Gi1/0/30 Enabled 128.30 0 DIS Disb No
Gi1/0/31 Enabled 128.31 0 DIS Disb No
Gi1/0/32 Enabled 128.32 0 DIS Disb No
Gi1/0/33 Enabled 128.33 20000 FWD Desg No
Gi1/0/34 Enabled 128.34 200000 FWD Desg No
Gi1/0/35 Enabled 128.35 20000 FWD Desg No
Gi1/0/36 Enabled 128.36 200000 FWD Desg No
Gi1/0/37 Enabled 128.37 20000 FWD Desg No
Gi1/0/38 Enabled 128.38 20000 FWD Desg No
Gi1/0/39 Enabled 128.39 200000 FWD Desg No
Gi1/0/40 Enabled 128.40 0 DIS Disb No
Gi1/0/41 Enabled 128.41 20000 FWD Desg No
Gi1/0/42 Enabled 128.42 20000 FWD Desg No
Gi1/0/43 Enabled 128.43 200000 FWD Desg No
Gi1/0/44 Enabled 128.44 200000 FWD Desg No
Gi1/0/45 Enabled 128.45 0 DIS Disb No
Gi1/0/46 Enabled 128.46 20000 FWD Desg No
Gi1/0/47 Enabled 128.47 200000 FWD Desg No
Gi1/0/48 Enabled 128.48 200000 FWD Desg No
Te1/0/1 Enabled 128.49 0 DIS Disb No
Te1/0/2 Enabled 128.50 0 DIS Disb No
Te1/0/3 Enabled 128.51 0 DIS Disb No
Te1/0/4 Enabled 128.52 0 DIS Disb No
Gi2/0/1 Enabled 128.53 20000 FWD Desg No
Gi2/0/2 Enabled 128.54 20000 FWD Desg No
--More-- or (q)uit

Thanks again

Seddik

Hi,

Ok we will try to disable stp on this port after the weekend.

Meanwhile we checked the bpdu with your command:

vox-switch20(config)#show interfaces detail gi1/0/3

Port Description Duplex Speed Neg MTU Admin Link
State State
--------- --------------------------- ------ ------- ---- ----- ----- -----
Gi1/0/3 Full 1000 Auto 1518 Up Up

Port Description
--------- ----------------------------------------------------------------------
Gi1/0/3

Flow Control: Enabled
Port: Gi1/0/3
VLAN Membership mode: Access Mode

Operating parameters:
PVID: 10
Ingress Filtering: Enabled
Acceptable Frame Type: Admit All
Default Priority: 0
GVRP status: Disabled
Protected: Disabled

Port Gi1/0/3 is member in:

VLAN Name Egress rule Type
---- --------------------------------- ----------- --------
10 data Untagged Static

Static configuration:
PVID: 10
Ingress Filtering: Enabled
Acceptable Frame Type: Admit All

Port Gi1/0/3 is statically configured to:

VLAN Name Egress rule
---- --------------------------------- -----------
10 data Untagged

Forbidden VLANS:
VLAN Name
---- ---------------------------------

Port Gi1/0/3 Enabled
State: Forwarding Role: Designated
Port id: 128.3 Port Cost: 0
Port Fast: No (Configured: no ) Root Protection: No
Designated bridge Priority: 4096 Address: F48E.384F.0D1A
Designated port id: 128.3 Designated path cost: 0
CST Regional Root: 10:00:F4:8E:38:4F:0D:1A CST Port Cost: 0
BPDUs: Sent: 4247335, Received: 4243585

Is it a lot?

Thanks

Hi Daniel ,
After disabling stp on port gi1/0/3 the problem seems to be solved.
We continue to monitor to make sure nothing else break.

We have just question about setting up the Vlans in our topologie , specificly the  uplink between router and switch root (Gi 1/0/3) , so this interface must be configured with Trunking Mode && make sub-interfaces for all vlans in router ??

Many thanks for your advices and your help 

hello ,

Thank you in advence for your reply and consideration .

Best regards

 

Seddik Alaoui