cancelar
Mostrando los resultados de 
Buscar en lugar de 
Quiere decir: 
cancel
376
Visitas
0
ÚTIL
3
Respuestas

Spanning-tree blocked vlans over an uplink. Inconsistent VLAN

mauricio2099
Level 1
Level 1

I have 2 9500 stacks interconnected with 4 10G cables, bundled with LACP ( Portchannel 95)

The problem is that when I propagate a VLAN over the Port-Channel, VLAN 4 and the VLAN that I am passing, today VLAN 38, get blocked by spanning-tree and recovers a minute after.

*Jul 24 23:53:13.562: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan38, changed state to up
*Jul 24 23:54:52.902: %SPANTREE-2-BLOCK_PVID_PEER: Blocking Port-channel95 on VLAN0038. Inconsistent peer vlan.
*Jul 24 23:54:52.902: %SPANTREE-2-BLOCK_PVID_LOCAL: Blocking Port-channel95 on VLAN0004. Inconsistent local vlan.
*Jul 24 23:54:54.903: %LINK-3-UPDOWN: Interface Vlan38, changed state to down
*Jul 24 23:54:55.903: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan38, changed state to down
*Jul 24 23:55:07.902: %SPANTREE-2-UNBLOCK_CONSIST_PORT: Unblocking Port-channel95 on VLAN0038. Port consistency restored.
*Jul 24 23:55:07.902: %SPANTREE-2-UNBLOCK_CONSIST_PORT: Unblocking Port-channel95 on VLAN0004. Port consistency restored.
*Jul 24 23:55:11.574: %LINK-3-UPDOWN: Interface Vlan38, changed state to up
*Jul 24 23:55:12.575: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan38, changed state to up

Native VLAN 4 is the same on both stacks, and all VLANs in the trunk exist on L2.

Could you advise, why is this behavior present?

>stack1 configuration

spanning-tree mode rapid-pvst
spanning-tree extend system-id

errdisable recovery cause udld

errdisable recovery cause bpduguard

errdisable recovery cause l2ptguard

 

interface Port-channel95

switchport trunk native vlan 4

switchport trunk allowed vlan 4,8,16,38,43,48,50,63-66,93,110-115,220,241

switchport mode trunk

 

>stack2 configuration

spanning-tree mode rapid-pvst
spanning-tree loopguard default

spanning-tree portfast default

spanning-tree portfast bpduguard default

spanning-tree extend system-id

errdisable recovery cause udld

errdisable recovery cause bpduguard

errdisable recovery cause l2ptguard

 

interface Port-channel95

switchport trunk native vlan 4

switchport trunk allowed vlan 4,8,16,38,43,48,50,63-66,93,110-115,220,241

switchport mode trunk


Thank you so much for your help!

3 RESPUESTAS 3

Javier Acuña
Spotlight
Spotlight

Hola @mauricio2099 gracias por comunicarte con la comunidad de cisco podrías por favor compartir la configuración de la Vlan y el show spaning brief para validar el root del la Vlan

y así saber por donde esta aprendiendo la vlan.

Recuerda por favor apoyar con un like y si esto solventa la falla por favor seleccionar como respuesta solucionada

spanning-tree portfast default

spanning-tree portfast bpduguard default

Remove these two commands and check

MHM

If above not work inform me

MHM