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Weird STP Event - is this normal?

masterpro_pt
Level 1
Level 1

‎10-18-2018 01:58 AM

Hi all,

 

every second i receive the following mstp events on both our cisco nexus (3064PQ) that are in a VPC domain

this port-channel agregates 2 40Gb links.

 

2018 Oct 18 08:35:16.278912 stp: mstp_cist_select_root(1253): port-channel1 selected peer-switch RP
2018 Oct 18 08:35:16.285768 stp: mstp_msti_select_root(963): port-channel1 selected peer-switch RP
2018 Oct 18 08:35:16.285924 stp: mstp_msti_select_root(963): port-channel1 selected peer-switch RP
2018 Oct 18 08:35:16.286022 stp: stp_get_stp_in_hitless_flag(138): stp_gbl_in_hitless_rc_flag:0x0

thanks for the attention,

Sincerely,

AM

Labels:
0 Helpful
4 Replies 4

Andrea Testino
Cisco Employee
Cisco Employee

‎10-19-2018 08:30 AM

Hey AM,

 

Are these constant syslogs or were you running debugs? Can you share the following:

 

show vpc role
show run vpc
show run spanning-tree
show span vlan 1
show logging level spanning-tree
show span det | i ieee|occur|exec|from
show run int po1
show cdp neigh int po1
show logging log | i i stp | last 50

Thank you,

- Andrea, CCIE #56739 R&S
0 Helpful

masterpro_pt
Level 1
Level 1
In response to Andrea Testino

‎10-19-2018 09:26 AM

Hi Andrea,

 

The constant log only happens on "debug spanning-tree event"

SwitchCore02# show vpc role

vPC Role status
----------------------------------------------------
vPC role                        : secondary
Dual Active Detection Status    : 0
vPC system-mac                  : 00:23:04:ee:be:0a
vPC system-priority             : 32667
vPC local system-mac            : a4:93:4c:80:72:01
vPC local role-priority         : 4000
vPC local config role-priority  : 4000
vPC peer system-mac             : a4:4c:11:b8:e6:41
vPC peer role-priority          : 2000
vPC peer config role-priority   : 2000

SwitchCore02# show run vpc

!Command: show running-config vpc
!Time: Fri Oct 19 15:41:20 2018

version 7.0(3)I7(4)
feature vpc

vpc domain 10
  peer-switch
  role priority 4000
  peer-keepalive destination 192.168.1.10 source 192.168.1.11
  auto-recovery

interface port-channel1
  vpc peer-link

interface port-channel12
  vpc 12

interface port-channel15
  vpc 10

interface port-channel20
  vpc 20

interface port-channel21
  vpc 21

interface port-channel22
  vpc 22

interface port-channel23
  vpc 23

interface port-channel24
  vpc 24

interface port-channel25
  vpc 25

interface port-channel26
  vpc 26

interface port-channel27
  vpc 27

interface port-channel28
  vpc 28

interface port-channel29
  vpc 29

interface port-channel30
  vpc 30

interface port-channel31
  vpc 31

SwitchCore02# sh run spanning-tree
spanning-tree mode mst
spanning-tree mst 0-1 priority 8192
spanning-tree mst configuration
  name region1
  instance 1 vlan 1,20-21,25,30,110
interface port-channel1
  spanning-tree port type network
interface port-channel20
  spanning-tree port type edge
interface port-channel21
  spanning-tree port type edge
interface port-channel22
  spanning-tree port type edge
interface port-channel23
  spanning-tree port type edge
interface port-channel24
  spanning-tree port type edge
interface port-channel25
  spanning-tree port type edge
interface port-channel26
  spanning-tree port type edge
interface port-channel27
  spanning-tree port type edge
interface port-channel28
  spanning-tree port type edge
interface port-channel29
  spanning-tree port type edge
interface port-channel30
  spanning-tree port type edge
interface Ethernet1/14
  spanning-tree port type edge
  spanning-tree guard root
interface Ethernet1/25
  spanning-tree port type edge
interface Ethernet1/41
  spanning-tree guard root
interface Ethernet1/42
  spanning-tree guard root
interface Ethernet1/43
  spanning-tree guard root
interface Ethernet1/44
  spanning-tree guard root

SwitchCore02# show span vlan 1

MST0001
  Spanning tree enabled protocol mstp
  Root ID    Priority    4097
             Address     0023.04ee.be0a
             Cost        250
             Port        4096 (port-channel1)
             Hello Time  2  sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    8193   (priority 8192 sys-id-ext 1)
             Address     0023.04ee.be0a
             Hello Time  2  sec  Max Age 20 sec  Forward Delay 15 sec

Interface        Role Sts Cost      Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po1              Root FWD 250       128.4096 (vPC peer-link) Network P2p
Po12             Desg FWD 200       128.4107 (vPC) P2p Bound(STP)
Po20             Desg FWD 200       128.4115 (vPC) Edge P2p
Po21             Desg FWD 200       128.4116 (vPC) Edge P2p
Po22             Desg FWD 200       128.4117 (vPC) Edge P2p
Po24             Desg FWD 200       128.4119 (vPC) Edge P2p
Po25             Desg FWD 200       128.4120 (vPC) Edge P2p
Po28             Desg FWD 200       128.4123 (vPC) Edge P2p
Po29             Desg FWD 200       128.4124 (vPC) P2p
Po30             Desg FWD 200       128.4125 (vPC) P2p
Po31             Desg BLK 200       128.4126 (vPC) P2p
Eth1/9           Desg FWD 20000     128.9    P2p
Eth1/14          Desg FWD 20000     128.14   P2p
Eth1/25          Desg FWD 20000     128.25   Edge P2p
Eth1/29          Desg FWD 20000     128.29   P2p
Eth1/30          Desg FWD 20000     128.30   P2p
Eth1/41          Desg FWD 20000     128.41   P2p
Eth1/42          Desg FWD 20000     128.42   P2p
Eth1/43          Desg FWD 2000      128.43   P2p
Eth1/44          Desg FWD 20000     128.44   P2p

SwitchCore02# show logging level spanning-tree
Facility        Default Severity        Current Session Severity
--------        ----------------        ------------------------
stp                     3                       3

0(emergencies)          1(alerts)       2(critical)
3(errors)               4(warnings)     5(notifications)
6(information)          7(debugging)

SwitchCore02# show span det | i ieee|occur|exec|from
 MST0000 is executing the mstp compatible Spanning Tree protocol
  Number of topology changes 614 last change occurred 0:14:16 ago
          from Ethernet1/41
 MST0001 is executing the mstp compatible Spanning Tree protocol
  Number of topology changes 617 last change occurred 0:14:16 ago
          from Ethernet1/41

SwitchCore02# show run int po1

!Command: show running-config interface port-channel1
!Time: Fri Oct 19 16:22:20 2018

version 7.0(3)I7(4)

interface port-channel1
  description 80G_UPLINK
  switchport mode trunk
  switchport trunk allowed vlan 1,20-21,25,30,45,110
  spanning-tree port type network
  vpc peer-link


SwitchCore02# show cdp neigh int po1
Capability Codes: R - Router, T - Trans-Bridge, B - Source-Route-Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater,
                  V - VoIP-Phone, D - Remotely-Managed-Device,
                  s - Supports-STP-Dispute

Device-ID          Local Intrfce  Hldtme Capability  Platform      Port ID
SwitchCore01.172.16.1.10(FOC1627R00P)
                    Eth1/49        140    R S I s   N3K-C3064PQ-1 Eth1/49
SwitchCore01.172.16.1.10(FOC1627R00P)
                    Eth1/51        140    R S I s   N3K-C3064PQ-1 Eth1/51

Total entries displayed: 2

SwitchCore02# show logging log | i i stp | last 50
2018 Oct  8 08:43:46 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/44 on MST0000.
2018 Oct  8 08:44:22 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/44 on MST0000.
2018 Oct  8 08:44:24 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/44 on MST0000.
2018 Oct  8 08:44:35 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/44 on MST0000.
2018 Oct  8 08:44:37 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/44 on MST0000.
2018 Oct  8 08:44:51 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/44 on MST0000.
2018 Oct  8 08:44:53 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/44 on MST0000.
2018 Oct  8 08:45:29 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/44 on MST0000.
2018 Oct  8 08:45:31 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/44 on MST0000.
2018 Oct  8 08:45:58 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/44 on MST0000.
2018 Oct  8 08:46:01 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/44 on MST0000.
2018 Oct  8 08:46:30 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/44 on MST0000.
2018 Oct  8 08:46:32 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/44 on MST0000.
2018 Oct  8 08:46:45 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/44 on MST0000.
2018 Oct  8 08:46:46 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/44 on MST0000.
2018 Oct  8 08:46:52 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/44 on MST0000.
2018 Oct  8 08:46:54 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/44 on MST0000.
2018 Oct 10 12:31:47 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/41 on MST0000.
2018 Oct 10 12:31:53 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/41 on MST0000.
2018 Oct 10 12:32:11 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/41 on MST0000.
2018 Oct 10 12:32:23 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/41 on MST0000.
2018 Oct 10 12:32:41 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/41 on MST0000.
2018 Oct 10 12:34:55 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/41 on MST0000.
2018 Oct 17 08:04:02 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/44 on MST0000.
2018 Oct 17 08:04:03 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/44 on MST0000.
2018 Oct 17 08:04:40 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/44 on MST0000.
2018 Oct 17 08:04:41 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/44 on MST0000.
2018 Oct 17 08:19:53 SwitchCore02 %STP-2-ROOTGUARD_CONFIG_CHANGE: Root guard enabled on port Ethernet1/44.
2018 Oct 17 08:24:14 SwitchCore02 %STP-2-ROOTGUARD_CONFIG_CHANGE: Root guard enabled on port Ethernet1/41.
2018 Oct 17 08:24:14 SwitchCore02 %STP-2-ROOTGUARD_CONFIG_CHANGE: Root guard enabled on port Ethernet1/42.
2018 Oct 17 08:24:14 SwitchCore02 %STP-2-ROOTGUARD_CONFIG_CHANGE: Root guard enabled on port Ethernet1/43.
2018 Oct 17 16:23:27 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/41 on MST0000.
2018 Oct 17 16:27:43 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/41 on MST0000.
2018 Oct 17 16:31:16 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/41 on MST0000.
2018 Oct 17 16:31:16 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/41 on MST0000.
2018 Oct 18 16:37:57 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/14 on MST0000.
2018 Oct 18 16:37:57 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/14 on MST0000.
2018 Oct 18 16:39:10 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/14 on MST0000.
2018 Oct 18 16:39:11 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/14 on MST0000.
2018 Oct 18 16:43:06 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/14 on MST0000.
2018 Oct 18 16:45:38 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/14 on MST0000.
2018 Oct 18 16:45:38 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/14 on MST0000.
2018 Oct 18 16:46:26 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/14 on MST0000.
2018 Oct 18 16:46:26 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/14 on MST0000.
2018 Oct 18 17:00:59 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/14 on MST0000.
2018 Oct 18 17:00:59 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/14 on MST0000.
2018 Oct 18 17:01:39 SwitchCore02 %STP-2-ROOTGUARD_CONFIG_CHANGE: Root guard disabled on port Ethernet1/14.
2018 Oct 18 17:06:56 SwitchCore02 %STP-2-ROOTGUARD_CONFIG_CHANGE: Root guard enabled on port Ethernet1/14.
2018 Oct 19 11:41:03 SwitchCore02 %STP-2-DISPUTE_DETECTED: Dispute detected on port Ethernet1/14 on MST0000.
2018 Oct 19 11:41:44 SwitchCore02 %STP-2-DISPUTE_CLEARED: Dispute resolved for port Ethernet1/14 on MST0000.

The last logs on  Ethernet1/14 are tests on a test switch

 

Thanks for the attention.

 

Sincerely,

AM

0 Helpful

Andrea Testino
Cisco Employee
Cisco Employee
In response to masterpro_pt

‎10-22-2018 06:12 AM

Hey AM,

 

It looks like you have fairly constant STP Disputes on this switch which would explain the debugs regarding cist/msti root election. I would open a TAC case to have a Nexus engineer trace the source of the STP Disputes for you.

 

Spanning-tree Disputes are triggered when the BPDU received from our connecting device is inferior (worse) however it has the Designated role and state as Learning and/or Forwarding. In simpler terms, there's another switch in your network that is claiming to be the STP root even though it has a higher STP priority.

 

Hope that helps.

- Andrea, CCIE #56739 R&S
0 Helpful

masterpro_pt
Level 1
Level 1
In response to Andrea Testino

‎10-22-2018 07:42 AM

Hi,

Thanks for the imput.

All other switches have the STP configured with higher values so that they dont disput it with the Nexus, maybe some incompatibility with other Vendors ( we have Cisco, HP, Linksys and Ubiquiti) the ones that offers more resistence are the HP's 1920s, that now are being blocked by the root guard option i activated.
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