SW_MATM-4-MACFLAP_NOTIF flapping between port Gi1/0/21 and port Gi1/0/

[matias-silva]

I am experiencing flap issues on my Cisco 9300 devices. These are connected to 9200 access switches, creating redundancy with two core switches (9300). The access switches have two uplink ports, one connected to each core switch. I have reviewed the spanning-tree, port-channel, and trunk configurations and have not detected any inconsistencies. All devices are provisioned in DNA Center.

When executing a show mac address for the MAC, it is observed that it oscillates between ports 21 and 22. I also checked for multiple MAC addresses on an access port to identify any out-of-standard switches, but nothing was found. No physical loop was detected either.

witch Ports Model SW Version SW Image Mode
------ ----- ----- ---------- ---------- ----
* 1 52 C9200L-48P-4X 17.09.04a CAT9K_LITE_IOSXE INSTALL

cm_tr_p2c_cabecera1_9300#sh etherchannel summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator

M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port

A - formed by Auto LAG

Number of channel-groups in use: 1
Number of aggregators: 1

Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) PAgP Gi1/0/23(P) Gi1/0/24(P)

cm_tr_p2c_cabecera1_9300#

cm_tr_p2c_cabecera1_9300# sh int trunk

Port Mode Encapsulation Status Native vlan
Gi1/0/20 on 802.1q trunking 1
Gi1/0/21 on 802.1q trunking 1
Gi1/0/22 on 802.1q trunking 1
Te1/1/1 on 802.1q trunking 1
Po1 on 802.1q trunking 1

Port Vlans allowed on trunk
Gi1/0/20 19,32,126,132
Gi1/0/21 19,32,126,132
Gi1/0/22 19,32,126,132
Te1/1/1 310,320
Po1 19,32,126,132

Port Vlans allowed and active in management domain
Gi1/0/20 19,32,126,132
Gi1/0/21 19,32,126,132
Gi1/0/22 19,32,126,132
Te1/1/1 310,320
Po1 19,32,126,132

Port Vlans in spanning tree forwarding state and not pruned
Gi1/0/20 19,32,126,132
Gi1/0/21 19,32,126,132
Gi1/0/22 19,32,126,132
Te1/1/1 310,320
Po1 19,32,126,132
cm_tr_p2c_cabecera1_9300#

cm_tr_p2c_cabecera1_9300# sh vl br

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4, Gi1/0/5, Gi1/0/6, Gi1/0/7, Gi1/0/8, Gi1/0/9, Gi1/0/10, Gi1/0/11, Gi1/0/12
Gi1/0/13, Gi1/0/14, Gi1/0/15, Gi1/0/16, Gi1/0/17, Gi1/0/18, Gi1/0/19, Te1/1/2, Te1/1/3, Te1/1/4, Te1/1/5
Te1/1/6, Te1/1/7, Te1/1/8, Ap1/0/1
19 Admin_y_Ospf active
32 Lan1 active
126 telefonia active
132 ToIP_P2C active
310 WAN_DATOS active
320 WAN_VOZ active
400 VLAN0400 active
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
cm_tr_p2c_cabecera1_9300#

cm_tr_p2c_cabecera1_9300# sh mac add ad c85a.cfa6.c721
Mac Address Table
-------------------------------------------

Vlan Mac Address Type Ports
---- ----------- -------- -----
32 c85a.cfa6.c721 DYNAMIC Gi1/0/22
Total Mac Addresses for this criterion: 1
cm_tr_p2c_cabecera1_9300# sh mac add ad c85a.cfa6.c721
Mac Address Table
-------------------------------------------

Vlan Mac Address Type Ports
---- ----------- -------- -----
32 c85a.cfa6.c721 DYNAMIC Gi1/0/21
Total Mac Addresses for this criterion: 1
cm_tr_p2c_cabecera1_9300# sh mac add ad c85a.cfa6.c721

[matias-silva]

cm_tr_p2c_cabecera2_9300#sh spanning-tree summary
El conmutador está en modo
rapid-pvst Puente raíz para: VLAN0001, VLAN0310, VLAN0320
ID del sistema extendido está habilitado
Portfast El valor predeterminado está deshabilitado
PortFast BPDU Guard El valor predeterminado está deshabilitado
Portfast BPDU Filter El valor predeterminado está deshabilitado
Loopguard El valor predeterminado está deshabilitado
EtherChannel misconfig guard está habilitado
UplinkFast está deshabilitado
BackboneFast está deshabilitado
El método Pathcost configurado utilizado es largo

Bloqueo de nombres Escucha Aprendizaje Reenvío STP Activo
---------------------- -------- --------- -------- ---------- ----------
VLAN0001 0 0 0 1
1 VLAN0019 0 0 0 4
4 VLAN0032 0 0 0 4 4
VLAN0132 0 0 0 4
4 VLAN0310 0 0 0 1
1 VLAN0320 0 0 0 1 1
---------------------- -------- --------- -------- ---------- ----------
6 VLAN 0 0 0 15 15
cm_tr_p2c_cabecera2_9300#

cm_tr_p2c_cabecera1_9300#sh spanning-tree summary
El conmutador está en modo
rapid-pvst Puente raíz para: VLAN0001, VLAN0019, VLAN0032, VLAN0132, VLAN0310, VLAN0320
ID del sistema extendido está habilitado
Portfast El valor predeterminado está deshabilitado
PortFast BPDU Guard El valor predeterminado está deshabilitado
Filtro BPDU Portfast El valor predeterminado está deshabilitado
Loopguard El valor predeterminado está deshabilitado
EtherChannel misconfig guard está habilitado
UplinkFast está deshabilitado
BackboneFast está deshabilitado
El método Pathcost configurado utilizado es largo

Nombre Bloqueo Escucha Aprendizaje Reenvío STP Activo
---------------------- -------- --------- -------- ---------- ----------VLAN0001
0 0 0 1 1
VLAN0019 0 0 0 4
4 VLAN0032 0 0 0 4 4
VLAN0132 0 0 0 4
4 VLAN0310 0 0 0 1
1 VLAN0320 0 0 0 1 1
---------------------- -------- --------- -------- ---------- ----------
6 VLAN 0 0 0 15 15

SW3_ACCESO_TR_P2C#sh spanning-tree summary
El conmutador está en modo
rapid-pvst Puente raíz para: ninguno
El ID del sistema extendido está habilitado
Portfast El valor predeterminado está deshabilitado
PortFast BPDU Guard El valor predeterminado está deshabilitado
Portfast BPDU Filter El valor predeterminado está deshabilitado
Loopguard El valor predeterminado está deshabilitado
EtherChannel misconfig guard está habilitado
UplinkFast está deshabilitado
BackboneFast está deshabilitado
El método Pathcost configurado utilizado es largo

Bloqueo de nombres Escucha Aprendizaje Reenvío STP Activo
---------------------- -------- --------- -------- ---------- ----------
VLAN0019 1 0 0 1 2
VLAN0032 1 0 0 14 15
VLAN0132 1 0 0 6 7
---------------------- -------- --------- -------- ---------- ----------
3 VLAN 3 0 0 21 24

SW2_ACCESO_TR_P2C#sh spanning-tree summary
Switch is in rapid-pvst mode
Root bridge for: none
Extended system ID is enabled
Portfast Default is disabled
PortFast BPDU Guard Default is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default is disabled
EtherChannel misconfig guard is enabled
UplinkFast is disabled
BackboneFast is disabled
Configured Pathcost method used is long

Bloqueo de nombres Escucha Aprendizaje Reenvío STP Activo
---------------------- -------- --------- -------- ---------- ----------
VLAN0019 1 0 0 1 2
VLAN0032 1 0 0 11 12
VLAN0132 1 0 0 4 5
---------------------- -------- --------- -------- ---------- ----------
3 VLAN 3 0 0 16 19

SW1_ACCESO_TR_P2C#sh spanning-tree summary
Switch is in rapid-pvst mode
Root bridge for: none
Extended system ID is enabled
Portfast Default is disabled
PortFast BPDU Guard Default is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default is disabled
EtherChannel misconfig guard is enabled
UplinkFast is disabled
BackboneFast is disabled
Configured Pathcost method used is long

Bloqueo de nombres Escucha Aprendizaje Reenvío STP Activo
---------------------- -------- --------- -------- ---------- ----------
VLAN0019 1 0 0 1 2
VLAN0032 1 0 0 26 27
VLAN0132 1 0 0 3 4
---------------------- -------- --------- -------- ---------- ----------

3 VLAN 3 0 0 30 33

[Jose Suarez]

Hi, 

Did you verify that all the switch were using the same STP(RSTP or rapid-pvst)?

Could you share the "show spanning-tree summary" of the access router too?

Best Regards

[matias-silva]

cm_tr_p2c_cabecera2_9300#sh spanning-tree summary
Switch is in rapid-pvst mode
Root bridge for: VLAN0001, VLAN0310, VLAN0320
Extended system ID is enabled
Portfast Default is disabled
PortFast BPDU Guard Default is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default is disabled
EtherChannel misconfig guard is enabled
UplinkFast is disabled
BackboneFast is disabled
Configured Pathcost method used is long

Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0001 0 0 0 1 1
VLAN0019 0 0 0 4 4
VLAN0032 0 0 0 4 4
VLAN0132 0 0 0 4 4
VLAN0310 0 0 0 1 1
VLAN0320 0 0 0 1 1
---------------------- -------- --------- -------- ---------- ----------
6 vlans 0 0 0 15 15
cm_tr_p2c_cabecera2_9300#

cm_tr_p2c_cabecera1_9300#sh spanning-tree summary
Switch is in rapid-pvst mode
Root bridge for: VLAN0001, VLAN0019, VLAN0032, VLAN0132, VLAN0310, VLAN0320
Extended system ID is enabled
Portfast Default is disabled
PortFast BPDU Guard Default is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default is disabled
EtherChannel misconfig guard is enabled
UplinkFast is disabled
BackboneFast is disabled
Configured Pathcost method used is long

Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0001 0 0 0 1 1
VLAN0019 0 0 0 4 4
VLAN0032 0 0 0 4 4
VLAN0132 0 0 0 4 4
VLAN0310 0 0 0 1 1
VLAN0320 0 0 0 1 1
---------------------- -------- --------- -------- ---------- ----------
6 vlans 0 0 0 15 15

SW3_ACCESO_TR_P2C#sh spanning-tree summary
Switch is in rapid-pvst mode
Root bridge for: none
Extended system ID is enabled
Portfast Default is disabled
PortFast BPDU Guard Default is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default is disabled
EtherChannel misconfig guard is enabled
UplinkFast is disabled
BackboneFast is disabled
Configured Pathcost method used is long

Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0019 1 0 0 1 2
VLAN0032 1 0 0 14 15
VLAN0132 1 0 0 6 7
---------------------- -------- --------- -------- ---------- ----------
3 vlans 3 0 0 21 24

SW2_ACCESO_TR_P2C#sh spanning-tree summary
Switch is in rapid-pvst mode
Root bridge for: none
Extended system ID is enabled
Portfast Default is disabled
PortFast BPDU Guard Default is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default is disabled
EtherChannel misconfig guard is enabled
UplinkFast is disabled
BackboneFast is disabled
Configured Pathcost method used is long

Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0019 1 0 0 1 2
VLAN0032 1 0 0 11 12
VLAN0132 1 0 0 4 5
---------------------- -------- --------- -------- ---------- ----------
3 vlans 3 0 0 16 19

SW1_ACCESO_TR_P2C#sh spanning-tree summary
Switch is in rapid-pvst mode
Root bridge for: none
Extended system ID is enabled
Portfast Default is disabled
PortFast BPDU Guard Default is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default is disabled
EtherChannel misconfig guard is enabled
UplinkFast is disabled
BackboneFast is disabled
Configured Pathcost method used is long

Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0019 1 0 0 1 2
VLAN0032 1 0 0 26 27
VLAN0132 1 0 0 3 4
---------------------- -------- --------- -------- ---------- ----------
3 vlans 3 0 0 30 33

[MHM Cisco World]

Root bridge for: VLAN0001, VLAN0310, VLAN0320 <<- SW9300-2
Root bridge for: VLAN0001, VLAN0019, VLAN0032, VLAN0132, VLAN0310, VLAN0320 <<-SW9300-1
This not same share you provide before 
sure this STP issue 

[matias-silva]

I don’t have VLANs 310 and 320 configured in the spanning tree; those VLANs are used for the WAN.

[matias-silva]

cm_tr_p2c_cabecera2_9300#sh run | sec spanning-tree
spanning-tree mode rapid-pvst
spanning-tree extend system-id
spanning-tree vlan 19,32,132 priority 4096
spanning-tree guard root
spanning-tree guard root
spanning-tree guard root
cm_tr_p2c_cabecera2_9300#

cm_tr_p2c_cabecera1_9300# sh run | sec spanning-tree
spanning-tree mode rapid-pvst
spanning-tree extend system-id
spanning-tree vlan 19,32,132 priority 0
spanning-tree guard root
spanning-tree guard root
spanning-tree guard root
spanning-tree portfast
spanning-tree portfast

[MHM Cisco World]

It new Little clear

First wait @Jose Suarez reply 

For me 

1- you run guard root in both SW ? In which interface ?

2- you not allow vlan1 in any trunk?? Which is native of all trunk?

3- you dont allow vlan 310 and 320 in PO between two 9300 SW?

MHM

[matias-silva]

OK thanks,

1- you run guard root in both SW ? In which interface ?
Yes, I configured guard root on both switches on interfaces g1/0/20, g1/0/21, and g1/0/22, which are connected to the C9200s.
2- you not allow vlan1 in any trunk?? Which is native of all trunk?
I do not allow VLAN 1 on any trunk; the native VLAN should be 032 (data).

3- you dont allow vlan 310 and 320 in PO between two 9300 SW?
I do not allow VLANs 310 and 320 on the port-channel.

[MHM Cisco World]

Then return to me first reply' it issue of native vlan.

Now what you need 

1- check cost' I mention I see cost 15 why that ? As I see you use cost method long 

2- are ypu sure native is 32 in all trunk' I see in some of output ypu share the native was vlan 1

3- allow vlan 1' it already by defualt in all SW so make pvst send bpdu and close any loop of this vlan

Thanks a lot

MHM

[matias-silva]

cm_tr_p2c_cabecera1_9300#sh spanning-tree int g1/0/20 de
Port 20 (GigabitEthernet1/0/20) of VLAN0019 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.20.
Designated root has priority 19, address c47e.e094.5e00
Designated bridge has priority 19, address c47e.e094.5e00
Designated port id is 128.20, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748774, received 17

Port 20 (GigabitEthernet1/0/20) of VLAN0032 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.20.
Designated root has priority 32, address c47e.e094.5e00
Designated bridge has priority 32, address c47e.e094.5e00
Designated port id is 128.20, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748774, received 17

Port 20 (GigabitEthernet1/0/20) of VLAN0132 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.20.
Designated root has priority 132, address c47e.e094.5e00
Designated bridge has priority 132, address c47e.e094.5e00
Designated port id is 128.20, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748774, received 17
cm_tr_p2c_cabecera1_9300#sh spanning-tree int g1/0/21 de
Port 21 (GigabitEthernet1/0/21) of VLAN0019 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.21.
Designated root has priority 19, address c47e.e094.5e00
Designated bridge has priority 19, address c47e.e094.5e00
Designated port id is 128.21, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748777, received 13

Port 21 (GigabitEthernet1/0/21) of VLAN0032 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.21.
Designated root has priority 32, address c47e.e094.5e00
Designated bridge has priority 32, address c47e.e094.5e00
Designated port id is 128.21, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748777, received 13

Port 21 (GigabitEthernet1/0/21) of VLAN0132 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.21.
Designated root has priority 132, address c47e.e094.5e00
Designated bridge has priority 132, address c47e.e094.5e00
Designated port id is 128.21, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748777, received 13
cm_tr_p2c_cabecera1_9300#sh spanning-tree int g1/0/22 de
Port 22 (GigabitEthernet1/0/22) of VLAN0019 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.22.
Designated root has priority 19, address c47e.e094.5e00
Designated bridge has priority 19, address c47e.e094.5e00
Designated port id is 128.22, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748778, received 14

Port 22 (GigabitEthernet1/0/22) of VLAN0032 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.22.
Designated root has priority 32, address c47e.e094.5e00
Designated bridge has priority 32, address c47e.e094.5e00
Designated port id is 128.22, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748778, received 13

Port 22 (GigabitEthernet1/0/22) of VLAN0132 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.22.
Designated root has priority 132, address c47e.e094.5e00
Designated bridge has priority 132, address c47e.e094.5e00
Designated port id is 128.22, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748778, received 13
cm_tr_p2c_cabecera1_9300#

cm_tr_p2c_cabecera2_9300#sh spanning-tree int g1/0/20 de
Port 20 (GigabitEthernet1/0/20) of VLAN0019 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.20.
Designated root has priority 19, address c47e.e094.5e00
Designated bridge has priority 4115, address c47e.e078.5380
Designated port id is 128.20, designated path cost 10000
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 3
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748810, received 18

Port 20 (GigabitEthernet1/0/20) of VLAN0032 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.20.
Designated root has priority 32, address c47e.e094.5e00
Designated bridge has priority 4128, address c47e.e078.5380
Designated port id is 128.20, designated path cost 10000
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 3
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748808, received 18

Port 20 (GigabitEthernet1/0/20) of VLAN0132 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.20.
Designated root has priority 132, address c47e.e094.5e00
Designated bridge has priority 4228, address c47e.e078.5380
Designated port id is 128.20, designated path cost 10000
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 3
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748804, received 17
cm_tr_p2c_cabecera2_9300#sh spanning-tree int g1/0/21 de
Port 21 (GigabitEthernet1/0/21) of VLAN0019 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.21.
Designated root has priority 19, address c47e.e094.5e00
Designated bridge has priority 4115, address c47e.e078.5380
Designated port id is 128.21, designated path cost 10000
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 3
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748810, received 18

Port 21 (GigabitEthernet1/0/21) of VLAN0032 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.21.
Designated root has priority 32, address c47e.e094.5e00
Designated bridge has priority 4128, address c47e.e078.5380
Designated port id is 128.21, designated path cost 10000
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 3
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748808, received 16

Port 21 (GigabitEthernet1/0/21) of VLAN0132 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.21.
Designated root has priority 132, address c47e.e094.5e00
Designated bridge has priority 4228, address c47e.e078.5380
Designated port id is 128.21, designated path cost 10000
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 3
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748808, received 15
cm_tr_p2c_cabecera2_9300#sh spanning-tree int g1/0/22 de
Port 22 (GigabitEthernet1/0/22) of VLAN0019 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.22.
Designated root has priority 19, address c47e.e094.5e00
Designated bridge has priority 4115, address c47e.e078.5380
Designated port id is 128.22, designated path cost 10000
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 3
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748810, received 15

Port 22 (GigabitEthernet1/0/22) of VLAN0032 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.22.
Designated root has priority 32, address c47e.e094.5e00
Designated bridge has priority 4128, address c47e.e078.5380
Designated port id is 128.22, designated path cost 10000
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 3
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748808, received 17

Port 22 (GigabitEthernet1/0/22) of VLAN0132 is designated forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.22.
Designated root has priority 132, address c47e.e094.5e00
Designated bridge has priority 4228, address c47e.e078.5380
Designated port id is 128.22, designated path cost 10000
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 4
Link type is point-to-point by default
Root guard is enabled on the port
BPDU: sent 2748813, received 17
cm_tr_p2c_cabecera2_9300#

cm_tr_p2c_cabecera1_9300# show interfaces trunk

Port Mode Encapsulation Status Native vlan
Gi1/0/20 on 802.1q trunking 1
Gi1/0/21 on 802.1q trunking 1
Gi1/0/22 on 802.1q trunking 1
Te1/1/1 on 802.1q trunking 1
Po1 on 802.1q trunking 1

Port Vlans allowed on trunk
Gi1/0/20 19,32,126,132
Gi1/0/21 19,32,126,132
Gi1/0/22 19,32,126,132
Te1/1/1 310,320
Po1 19,32,132

Port Vlans allowed and active in management domain
Gi1/0/20 19,32,132
Gi1/0/21 19,32,132
Gi1/0/22 19,32,132
Te1/1/1 310,320
Po1 19,32,132

Port Vlans in spanning tree forwarding state and not pruned
Gi1/0/20 19,32,132
Gi1/0/21 19,32,132
Gi1/0/22 19,32,132
Te1/1/1 310,320
Po1 19,32,132
cm_tr_p2c_cabecera1_9300#

cm_tr_p2c_cabecera2_9300# show interfaces trunk

Port Mode Encapsulation Status Native vlan
Gi1/0/20 on 802.1q trunking 1
Gi1/0/21 on 802.1q trunking 1
Gi1/0/22 on 802.1q trunking 1
Te1/1/1 on 802.1q trunking 1
Po1 on 802.1q trunking 1

Port Vlans allowed on trunk
Gi1/0/20 19,32,126,132
Gi1/0/21 19,32,126,132
Gi1/0/22 19,32,126,132
Te1/1/1 310,320
Po1 19,32,132

Port Vlans allowed and active in management domain
Gi1/0/20 19,32,132
Gi1/0/21 19,32,132
Gi1/0/22 19,32,132
Te1/1/1 310,320
Po1 19,32,132

Port Vlans in spanning tree forwarding state and not pruned
Gi1/0/20 19,32,132
Gi1/0/21 19,32,132
Gi1/0/22 19,32,132
Te1/1/1 310,320
Po1 19,32,132
cm_tr_p2c_cabecera2_9300#

[Jose Suarez]

Hi,

It looks like there might be a mismatch with the native VLANs between the switches ,the 9300 has VLAN 1 as native, and it seems like the access switches are using VLAN 32. Could you share the outputs of show interfaces trunk and show vlan brief from both the access and core switches? 

That way we can confirm and clear up any doubts

Regards,

[matias-silva]

SW3_ACCESO_TR_P2C#show int trunk

Port Mode Encapsulation Status Native vlan
Gi1/0/47 on 802.1q trunking 1
Gi1/0/48 on 802.1q trunking 1

Port Vlans allowed on trunk
Gi1/0/47 19,32,132
Gi1/0/48 19,32,132

Port Vlans allowed and active in management domain
Gi1/0/47 19,32,132
Gi1/0/48 19,32,132

Port Vlans in spanning tree forwarding state and not pruned
Gi1/0/47 19,32,132
Gi1/0/48 none
SW3_ACCESO_TR_P2C#sh vlan br

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Te1/1/1, Te1/1/2, Te1/1/3, Te1/1/4
19 ADMIN active
32 usuarios active Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4, Gi1/0/5, Gi1/0/6, Gi1/0/7, Gi1/0/8, Gi1/0/9, Gi1/0/10, Gi1/0/11, Gi1/0/12, Gi1/0/13, Gi1/0/14, Gi1/0/15, Gi1/0/16, Gi1/0/17, Gi1/0/18, Gi1/0/19, Gi1/0/20 Gi1/0/21, Gi1/0/22, Gi1/0/23, Gi1/0/24, Gi1/0/25, Gi1/0/26, Gi1/0/27, Gi1/0/28, Gi1/0/29, Gi1/0/30, Gi1/0/31, Gi1/0/32, Gi1/0/33, Gi1/0/34, Gi1/0/35, Gi1/0/36, Gi1/0/37, Gi1/0/38, Gi1/0/39
Gi1/0/40, Gi1/0/41, Gi1/0/42, Gi1/0/43, Gi1/0/44, Gi1/0/45, Gi1/0/46
132 voicevlan active Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4, Gi1/0/5, Gi1/0/6, Gi1/0/7, Gi1/0/8, Gi1/0/9, Gi1/0/10, Gi1/0/11, Gi1/0/12, Gi1/0/13, Gi1/0/14, Gi1/0/15, Gi1/0/16, Gi1/0/17, Gi1/0/18, Gi1/0/19, Gi1/0/20 Gi1/0/21, Gi1/0/22, Gi1/0/23, Gi1/0/24, Gi1/0/25, Gi1/0/26, Gi1/0/27, Gi1/0/28, Gi1/0/29, Gi1/0/30, Gi1/0/31, Gi1/0/32, Gi1/0/33, Gi1/0/34, Gi1/0/35, Gi1/0/36, Gi1/0/37, Gi1/0/38, Gi1/0/39
Gi1/0/40, Gi1/0/41, Gi1/0/42, Gi1/0/43, Gi1/0/44, Gi1/0/45, Gi1/0/46
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
SW3_ACCESO_TR_P2C#

SW2_ACCESO_TR_P2C#sh int trunk

Port Mode Encapsulation Status Native vlan
Gi1/0/47 on 802.1q trunking 1
Gi1/0/48 on 802.1q trunking 1

Port Vlans allowed on trunk
Gi1/0/47 19,32,132
Gi1/0/48 19,32,132

Port Vlans allowed and active in management domain
Gi1/0/47 19,32,132
Gi1/0/48 19,32,132

Port Vlans in spanning tree forwarding state and not pruned
Gi1/0/47 19,32,132
Gi1/0/48 none
SW2_ACCESO_TR_P2C#sh vl br

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Te1/1/1, Te1/1/2, Te1/1/3, Te1/1/4
19 ADMIN active
32 usuarios active Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4, Gi1/0/5, Gi1/0/6, Gi1/0/7, Gi1/0/8, Gi1/0/9, Gi1/0/10, Gi1/0/11, Gi1/0/12, Gi1/0/13, Gi1/0/14, Gi1/0/15, Gi1/0/16, Gi1/0/17, Gi1/0/18, Gi1/0/19, Gi1/0/20 Gi1/0/21, Gi1/0/22, Gi1/0/23, Gi1/0/24, Gi1/0/25, Gi1/0/26, Gi1/0/27, Gi1/0/28, Gi1/0/29, Gi1/0/30, Gi1/0/31, Gi1/0/32, Gi1/0/33, Gi1/0/34, Gi1/0/35, Gi1/0/36, Gi1/0/37, Gi1/0/38, Gi1/0/39
Gi1/0/40, Gi1/0/41, Gi1/0/42, Gi1/0/43, Gi1/0/44, Gi1/0/45, Gi1/0/46
132 voicevlan active Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4, Gi1/0/5, Gi1/0/6, Gi1/0/7, Gi1/0/8, Gi1/0/9, Gi1/0/10, Gi1/0/11, Gi1/0/12, Gi1/0/13, Gi1/0/14, Gi1/0/15, Gi1/0/16, Gi1/0/17, Gi1/0/18, Gi1/0/19, Gi1/0/20 Gi1/0/21, Gi1/0/22, Gi1/0/23, Gi1/0/24, Gi1/0/25, Gi1/0/26, Gi1/0/27, Gi1/0/28, Gi1/0/29, Gi1/0/30, Gi1/0/31, Gi1/0/32, Gi1/0/33, Gi1/0/34, Gi1/0/35, Gi1/0/36, Gi1/0/37, Gi1/0/38, Gi1/0/39
Gi1/0/40, Gi1/0/41, Gi1/0/42, Gi1/0/43, Gi1/0/44, Gi1/0/45, Gi1/0/46
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
SW2_ACCESO_TR_P2C#

SW1_ACCESO_TR_P2C#sh int trunk

Port Mode Encapsulation Status Native vlan
Gi1/0/47 on 802.1q trunking 1
Gi1/0/48 on 802.1q trunking 1

Port Vlans allowed on trunk
Gi1/0/47 19,32,132
Gi1/0/48 19,32,132

Port Vlans allowed and active in management domain
Gi1/0/47 19,32,132
Gi1/0/48 19,32,132

Port Vlans in spanning tree forwarding state and not pruned
Gi1/0/47 19,32,132
Gi1/0/48 none
SW1_ACCESO_TR_P2C#sh vl br

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Te1/1/1, Te1/1/2, Te1/1/3, Te1/1/4
19 ADMIN active
32 usuarios active Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4, Gi1/0/5, Gi1/0/6, Gi1/0/7, Gi1/0/8, Gi1/0/9, Gi1/0/10, Gi1/0/11, Gi1/0/12, Gi1/0/13, Gi1/0/14, Gi1/0/15, Gi1/0/16, Gi1/0/17, Gi1/0/18, Gi1/0/19, Gi1/0/20 Gi1/0/21, Gi1/0/22, Gi1/0/23, Gi1/0/24, Gi1/0/25, Gi1/0/26, Gi1/0/27, Gi1/0/28, Gi1/0/29, Gi1/0/30, Gi1/0/31, Gi1/0/32, Gi1/0/33, Gi1/0/34, Gi1/0/35, Gi1/0/36, Gi1/0/37, Gi1/0/38, Gi1/0/39
Gi1/0/40, Gi1/0/41, Gi1/0/42, Gi1/0/43, Gi1/0/44, Gi1/0/45, Gi1/0/46
132 voicevlan active Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4, Gi1/0/5, Gi1/0/6, Gi1/0/7, Gi1/0/8, Gi1/0/9, Gi1/0/10, Gi1/0/11, Gi1/0/12, Gi1/0/13, Gi1/0/14, Gi1/0/15, Gi1/0/16, Gi1/0/17, Gi1/0/18, Gi1/0/19, Gi1/0/20 Gi1/0/21, Gi1/0/22, Gi1/0/23, Gi1/0/24, Gi1/0/25, Gi1/0/26, Gi1/0/27, Gi1/0/28, Gi1/0/29, Gi1/0/30, Gi1/0/31, Gi1/0/32, Gi1/0/33, Gi1/0/34, Gi1/0/35, Gi1/0/36, Gi1/0/37, Gi1/0/38, Gi1/0/39
Gi1/0/40, Gi1/0/41, Gi1/0/42, Gi1/0/43, Gi1/0/44, Gi1/0/45, Gi1/0/46
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
SW1_ACCESO_TR_P2C#

cm_tr_p2c_cabecera2_9300#sh int trunk

Port Mode Encapsulation Status Native vlan
Gi1/0/20 on 802.1q trunking 1
Gi1/0/21 on 802.1q trunking 1
Gi1/0/22 on 802.1q trunking 1
Te1/1/1 on 802.1q trunking 1
Po1 on 802.1q trunking 1

Port Vlans allowed on trunk
Gi1/0/20 19,32,126,132
Gi1/0/21 19,32,126,132
Gi1/0/22 19,32,126,132
Te1/1/1 310,320
Po1 19,32,132

Port Vlans allowed and active in management domain
Gi1/0/20 19,32,132
Gi1/0/21 19,32,132
Gi1/0/22 19,32,132
Te1/1/1 310,320
Po1 19,32,132

Port Vlans in spanning tree forwarding state and not pruned
Gi1/0/20 19,32,132
Gi1/0/21 19,32,132
Gi1/0/22 19,32,132
Te1/1/1 310,320
Po1 19,32,132
cm_tr_p2c_cabecera2_9300# sh vl b

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4, Gi1/0/5, Gi1/0/6, Gi1/0/7, Gi1/0/8, Gi1/0/9, Gi1/0/10, Gi1/0/11, Gi1/0/12, Gi1/0/13, Gi1/0/14, Gi1/0/15, Gi1/0/16, Gi1/0/17, Gi1/0/18, Gi1/0/19, Te1/1/2
Te1/1/3, Te1/1/4, Te1/1/5, Te1/1/6, Te1/1/7, Te1/1/8, Ap1/0/1
19 Admin_y_Ospf active
32 Lan1 active
132 ToIP_P2C active
310 WAN_DATOS active
320 WAN_VOZ active
400 VLAN0400 active
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
cm_tr_p2c_cabecera2_9300#

cm_tr_p2c_cabecera1_9300#sh int trunk

Port Mode Encapsulation Status Native vlan
Gi1/0/20 on 802.1q trunking 1
Gi1/0/21 on 802.1q trunking 1
Gi1/0/22 on 802.1q trunking 1
Te1/1/1 on 802.1q trunking 1
Po1 on 802.1q trunking 1

Port Vlans allowed on trunk
Gi1/0/20 19,32,126,132
Gi1/0/21 19,32,126,132
Gi1/0/22 19,32,126,132
Te1/1/1 310,320
Po1 19,32,132

Port Vlans allowed and active in management domain
Gi1/0/20 19,32,132
Gi1/0/21 19,32,132
Gi1/0/22 19,32,132
Te1/1/1 310,320
Po1 19,32,132

Port Vlans in spanning tree forwarding state and not pruned
Gi1/0/20 19,32,132
Gi1/0/21 19,32,132
Gi1/0/22 19,32,132
Te1/1/1 310,320
Po1 19,32,132
cm_tr_p2c_cabecera1_9300#sh vl br

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Gi1/0/1, Gi1/0/2, Gi1/0/3, Gi1/0/4, Gi1/0/5, Gi1/0/6, Gi1/0/7, Gi1/0/8, Gi1/0/9, Gi1/0/10, Gi1/0/11, Gi1/0/12, Gi1/0/13, Gi1/0/14, Gi1/0/15, Gi1/0/16, Gi1/0/17, Gi1/0/18, Gi1/0/19, Te1/1/2
Te1/1/3, Te1/1/4, Te1/1/5, Te1/1/6, Te1/1/7, Te1/1/8, Ap1/0/1
19 Admin_y_Ospf active
32 Lan1 active
132 ToIP_P2C active
310 WAN_DATOS active
320 WAN_VOZ active
400 VLAN0400 active
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
cm_tr_p2c_cabecera1_9300#

[MHM Cisco World]

Please make sure vlan 32 is native in core Sw and access SW 

You can not set native in core vlan1 and in access SW vlan 32

MHM

[matias-silva]

Upon closer review, I noticed that VLAN 1 appears as the native VLAN on all devices, and I don’t have any configuration related to the native VLAN.

[MHM Cisco World]

please check note in red color