Este documento describe cómo configurar el par-Switch en el Switches Cisco Nexus de la serie 7000 para permitir que las conexiones NON-virtuales del Canal de puerto (NON-VPC) carguen el equilibrio entre los VLA N.
Cuando se habilita el par-Switch, cada 7000 Switch del nexo comparte un Bridge ID virtual, que permite que ambo Switches actúe como raíz para el VLA N. Para los dispositivos con una conexión a cada 7000 Switch del nexo en el dominio del vPC que no son capaces del puerto que canaliza, la topología de la capa 2 (L2) confía en el Spanning Tree Protocol (STP) para bloquear los links redundantes. La característica del par-Switch permite para que las configuraciones pseudo-STP permitan que las conexiones de NON-VPC carguen los estados de la balanza STP entre los dos 7000 Switch del nexo. Este documento discute detalladamente la razón de las configuraciones pseudo-STP y cómo afectan a NON-VPC y a los links del vPC.
Una mezcla de vPC y de links de NON-VPC se llama una configuración híbrida.
Las direcciones MAC para cada Switch usado en el ejemplo de configuración en este documento son:
Cisco recomienda que tenga conocimiento sobre estos temas:
La información en este documento se basa en el Switches Cisco Nexus de la serie 7000 con el módulo del Supervisor 1.
La información que contiene este documento se creó a partir de los dispositivos en un ambiente de laboratorio específico. Todos los dispositivos que se utilizan en este documento se pusieron en funcionamiento con una configuración verificada (predeterminada). Si la red está funcionando, asegúrese de haber comprendido el impacto que puede tener cualquier comando.
Éste es un diagrama de la red de una configuración híbrida sin el par-Switch habilitado. Ambos 7000 Switch del nexo se configuran con una prioridad de 8192 para todos los VLA N. N7K-1 gana la elección del Bridge porque tiene el Bridge ID más bajo. Por lo tanto, usted espera que SW-1 bloquee en el link de N7K-2. SW-2 está conectado con los 7000 Switch del nexo vía un vPC y estará en un estatus de la expedición. SW-2 recibe las Unidades (BPDU) solamente del Switch primario en el vPC, que es N7K-1 en este ejemplo.
SW-1# show span vlan 1VLAN0001
Spanning tree enabled protocol rstp
Root ID Priority 8193
Address 0024.986f.3b41
Cost 4
Port 295 (Ethernet2/39)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 0024.986f.3b44
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Eth2/39 Root FWD 4 128.295 P2p
Eth2/40 Altn BLK 4 128.296 P2p
SW-1# show span vlan 1 detail
VLAN0001 is executing the rstp compatible Spanning Tree protocol
Bridge Identifier has priority 32768, sysid 1, address 0024.986f.3b44
Configured hello time 2, max age 20, forward delay 15
Current root has priority 8193, address 0024.986f.3b41
Root port is 295 (Ethernet2/39), cost of root path is 4
Topology change flag not set, detected flag not set
Number of topology changes 4 last change occurred 0:29:13 ago
from Ethernet2/39
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Timers: hello 0, topology change 0, notification 0
Port 295 (Ethernet2/39) of VLAN0001 is root forwarding
Port path cost 4, Port priority 128, Port Identifier 128.295
Designated root has priority 8193, address 0024.986f.3b41
Designated bridge has priority 8193, address 0024.986f.3b41
Designated port id is 128.260, designated path cost 0, Topology change is set
Timers: message age 16, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
BPDU: sent 4, received 898
Port 296 (Ethernet2/40) of VLAN0001 is alternate blocking
Port path cost 4, Port priority 128, Port Identifier 128.296
Designated root has priority 8193, address 0024.986f.3b41
Designated bridge has priority 8193, address 0024.986f.3b42 <-- Although same priority,
Designated port id is 128.272, designated path cost 2 advertising Bridge ID is higher
Timers: message age 16, forward delay 0, hold 0 and therefore this link is BLK
Number of transitions to forwarding state: 2
Link type is point-to-point by default
BPDU: sent 6, received 895
Éste es un diagrama de la red del una configuración híbrida con el par-Switch habilitado. Cuando se habilita el par-Switch, cada 7000 Switch del nexo comparte un Bridge ID virtual que permita que ambo Switches actúe como raíz para el VLA N. El par-link del vPC está siempre en un estatus de la expedición y funciona con el protocolo de la interconexión del gateway L2 (L2GIP) para evitar el interligar de los loopes.
Cada 7000 Switch del nexo envía los BPDU con un Root Bridge identificado por el Bridge ID virtual. En los links del vPC, el Bridge designado ID también utiliza el Bridge ID virtual. Para los links de NON-VPC, el Bridge designado ID es el Bridge ID físico del 7000 Switch correspondiente del nexo. Esto permite que el Switch de NON-VPC (SW-1) tome una decisión de la raíz basada sobre los anuncios BPDU en vez de la prioridad de puerto.
Con el par-Switch habilitado, cada 7000 Switch del nexo genera los BPDU con el conjunto del Root Bridge al Bridge ID virtual y al Bridge designado fijados al Bridge ID físico. Puesto que las prioridades son lo mismo, todas las conexiones de NON-VPC siempre delanteras en el link conectado con el 7000 Switch del nexo con el Bridge ID más bajo (N7K-1 en este ejemplo) y el bloque en los links conectaron con el 7000 Switch del nexo con el Bridge ID más alto (N7K-2 en este ejemplo).
SW-1# show span vlan 1
VLAN0001
Spanning tree enabled protocol rstp
Root ID Priority 8193
Address 0023.04ee.be01
Cost 4
Port 295 (Ethernet2/39)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 0024.986f.3b44
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Eth2/39 Root FWD 4 128.295 P2p
Eth2/40 Altn BLK 4 128.296 P2p
SW-1# show span vlan 1 detail
VLAN0001 is executing the rstp compatible Spanning Tree protocol
Bridge Identifier has priority 32768, sysid 1, address 0024.986f.3b44
Configured hello time 2, max age 20, forward delay 15
Current root has priority 8193, address 0023.04ee.be01
Root port is 295 (Ethernet2/39), cost of root path is 4
Topology change flag not set, detected flag not set
Number of topology changes 6 last change occurred 0:25:38 ago
from Ethernet2/39
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Timers: hello 0, topology change 0, notification 0
Port 295 (Ethernet2/39) of VLAN0001 is root forwarding
Port path cost 4, Port priority 128, Port Identifier 128.295
Designated root has priority 8193, address 0023.04ee.be01 <---Root Bridge = virtual ID
Designated bridge has priority 8193, address 0024.986f.3b41 <---Designated Bridge ID = N7K-1
Designated port id is 128.260, designated path cost 0, Topology change is set
Timers: message age 16, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
BPDU: sent 4, received 2280
Port 296 (Ethernet2/40) of VLAN0001 is alternate blocking
Port path cost 4, Port priority 128, Port Identifier 128.296
Designated root has priority 8193, address 0023.04ee.be01 <---Root Bridge = virtual ID
Designated bridge has priority 8193, address 0024.986f.3b42 <---Designated Bridge ID = N7K-2
Designated port id is 128.272, designated path cost 0
Timers: message age 15, forward delay 0, hold 0
Number of transitions to forwarding state: 2
Link type is point-to-point by default
BPDU: sent 7, received 2278
Con el par-Switch habilitado, las conexiones del vPC reciben los BPDU con el Root Bridge y el Bridge designado fijados al Bridge ID virtual.
SW-2# show span vlan 1
VLAN0001
Spanning tree enabled protocol rstp
Root ID Priority 8193
Address 0023.04ee.be01
Cost 3
Port 4105 (port-channel10)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 0024.986f.3b43
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po10 Root FWD 3 128.4105 P2p
SW-2# show span vlan 1 detail
VLAN0001 is executing the rstp compatible Spanning Tree protocol
Bridge Identifier has priority 32768, sysid 1, address 0024.986f.3b43
Configured hello time 2, max age 20, forward delay 15
Current root has priority 8193, address 0023.04ee.be01
Root port is 4105 (port-channel10), cost of root path is 3
Topology change flag not set, detected flag not set
Number of topology changes 5 last change occurred 0:21:40 ago
from port-channel10
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Timers: hello 0, topology change 0, notification 0
Port 4105 (port-channel10) of VLAN0001 is root forwarding
Port path cost 3, Port priority 128, Port Identifier 128.4105
Designated root has priority 8193, address 0023.04ee.be01 <--- Virtual Bridge ID
Designated bridge has priority 8193, address 0023.04ee.be01 <--- Virtual Bridge ID
Designated port id is 128.4105, designated path cost 0, Topology change is set
Timers: message age 15, forward delay 0, hold 0
Number of transitions to forwarding state: 2
Link type is point-to-point by default
BPDU: sent 96, received 2804
Bajo configuración predeterminada del par-Switch, todos los VLA N en el Switch de NON-VPC están remitiendo en un solo link. Para cargar el equilibrio entre los VLA N, haber señalado y las prioridades raíz des divulgación se pueden establecer manualmente por medio de atravesar - las configuraciones de la pseduo-información del árbol. Cisco recomienda que la prioridad raíz conforme a la pseduo-información sea más baja que el mejor que atraviesa - prioridad del árbol para prevenir las notificaciones del cambio de la topología (TCN) bajo condiciones de la Conmutación por falla. Las prioridades señaladas pueden ser carga equilibrio entre los dos 7000 Switch del nexo en el dominio del vPC.
En este ejemplo, el atravesar global - las prioridades del árbol en ambos 7000 Switch del nexo se han establecido a 8192. Conforme a la pseudo-información, la prioridad raíz se ha configurado como 4096, que es más baja que la mejor prioridad de 8192. Por lo tanto, el Switch que está participando con el par-Switch habilitado se convierte en la raíz para el VLA N. Para cargar el equilibrio entre el dos Switches, las prioridades señaladas se alternan para el VLA N 9 y VLAN10. Para las conexiones de NON-VPC a SW-1, el VLA N 9 se remite en el link a N7K-1, y el VLAN10 se remite en el link a N7K-2.
Para el VLA N 9, SW-1 ve la pseudo prioridad de Root Bridge y Bridge ID como el mismo valor de N7K-1 y de N7K-2. Sin embargo, N7K-1 y N7K-2 envían sus pseudo prioridades señaladas configuradas. Por lo tanto, SW-1 ve la prioridad del Bridge designado de 8201 (8192 + 9) de N7K-1 y la prioridad del Bridge designado de 12297 (12288 + 9) de N7K-2; SW-1 elige el link hacia N7K-1 como el link de expedición en el VLA N 9.
SW-1# show span vlan 9
VLAN0009
Spanning tree enabled protocol rstp
Root ID Priority 4105
Address 0023.04ee.be01
Cost 4
Port 295 (Ethernet2/39)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32777 (priority 32768 sys-id-ext 9)
Address 0024.986f.3b44
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Eth2/39 Root FWD 4 128.295 P2p
Eth2/40 Altn BLK 4 128.296 P2p
SW-1# show span vlan 9 detail
VLAN0009 is executing the rstp compatible Spanning Tree protocol
Bridge Identifier has priority 32768, sysid 9, address 0024.986f.3b44
Configured hello time 2, max age 20, forward delay 15
Current root has priority 4105, address 0023.04ee.be01
Root port is 295 (Ethernet2/39), cost of root path is 4
Topology change flag not set, detected flag not set
Number of topology changes 16 last change occurred 0:06:56 ago
from Ethernet2/39
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Timers: hello 0, topology change 0, notification 0
Port 295 (Ethernet2/39) of VLAN0009 is root forwarding
Port path cost 4, Port priority 128, Port Identifier 128.295
Designated root has priority 4105, address 0023.04ee.be01 <--- Root Virtual Bridge ID
Designated bridge has priority 8201, address 0024.986f.3b41 <--- Designated N7K-1, 8201
Designated port id is 128.260, designated path cost 0
Timers: message age 15, forward delay 0, hold 0
Number of transitions to forwarding state: 3
Link type is point-to-point by default
BPDU: sent 31, received 3486
Port 296 (Ethernet2/40) of VLAN0009 is alternate blocking
Port path cost 4, Port priority 128, Port Identifier 128.296
Designated root has priority 4105, address 0023.04ee.be01 <--- Root Virtual Bridge ID
Designated bridge has priority 12297, address 0024.986f.3b42 <--- Designated is N7K-2, 12297
Designated port id is 128.272, designated path cost 0
Timers: message age 15, forward delay 0, hold 0
Number of transitions to forwarding state: 4
Link type is point-to-point by default
BPDU: sent 31, received 3496
Semejantemente para el VLAN10, SW-1 ve la pseudo prioridad de Root Bridge y Bridge ID como el mismo valor de N7K-1 y de N7K-2. Una vez más N7K-1 y N7K-2 envían sus pseudo prioridades señaladas configuradas. Para el VLAN10, SW-1 ve la prioridad del Bridge designado de 12298 (12288 + 10) de N7K-1 y la prioridad del Bridge designado de 8202 (8192 + 10) de N7K-2; SW-1 elige el link hacia N7K-2 como el link de expedición para el VLA N 10. de esta manera, los switches conectados de NON-VPC pueden cargar el estado del VLA N STP de la balanza entre N7K-1 y N7K-2.
SW-1# show span vlan 10 detail
VLAN0010 is executing the rstp compatible Spanning Tree protocol
Bridge Identifier has priority 32768, sysid 10, address 0024.986f.3b44
Configured hello time 2, max age 20, forward delay 15
Current root has priority 4106, address 0023.04ee.be01
Root port is 296 (Ethernet2/40), cost of root path is 4
Topology change flag not set, detected flag not set
Number of topology changes 7 last change occurred 0:07:13 ago
from Ethernet2/40
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Timers: hello 0, topology change 0, notification 0
Port 295 (Ethernet2/39) of VLAN0010 is alternate blocking
Port path cost 4, Port priority 128, Port Identifier 128.295
Designated root has priority 4106, address 0023.04ee.be01 <--- Root Virtual Bridge ID
Designated bridge has priority 12298, address 0024.986f.3b41 <--- Designated N7K-1, 12298
Designated port id is 128.260, designated path cost 0, Topology change is set
Timers: message age 16, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
BPDU: sent 4, received 3497
Port 296 (Ethernet2/40) of VLAN0010 is root forwarding
Port path cost 4, Port priority 128, Port Identifier 128.296
Designated root has priority 4106, address 0023.04ee.be01 <--- Root Virtual Bridge ID
Designated bridge has priority 8202, address 0024.986f.3b42 <--- Designated N7K-2, 8202
Designated port id is 128.272, designated path cost 0
Timers: message age 16, forward delay 0, hold 0
Number of transitions to forwarding state: 3
Link type is point-to-point by default
BPDU: sent 10, received 3492
Para los links del vPC, la raíz y el uso señalado de los campos la pseudo prioridad raíz y el Bridge ID virtual, respectivamente.
SW-2# show span vlan 9
VLAN0009
Spanning tree enabled protocol rstp
Root ID Priority 4105
Address 0023.04ee.be01
Cost 3
Port 4105 (port-channel10)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32777 (priority 32768 sys-id-ext 9)
Address 0024.986f.3b43
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po10 Root FWD 3 128.4105 P2p
SW-2# show span vlan 10
VLAN0010
Spanning tree enabled protocol rstp
Root ID Priority 4106
Address 0023.04ee.be01
Cost 3
Port 4105 (port-channel10)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32778 (priority 32768 sys-id-ext 10)
Address 0024.986f.3b43
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po10 Root FWD 3 128.4105 P2p
SW-2#show span vlan 9 detail
VLAN0009 is executing the rstp compatible Spanning Tree protocol
Bridge Identifier has priority 32768, sysid 9, address 0024.986f.3b43
Configured hello time 2, max age 20, forward delay 15
Current root has priority 4105, address 0023.04ee.be01
Root port is 4105 (port-channel10), cost of root path is 3
Topology change flag not set, detected flag not set
Number of topology changes 12 last change occurred 0:04:29 ago
from port-channel10
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Timers: hello 0, topology change 0, notification 0
Port 4105 (port-channel10) of VLAN0009 is root forwarding
Port path cost 3, Port priority 128, Port Identifier 128.4105
Designated root has priority 4105, address 0023.04ee.be01 <--- Root Virtual Bridge ID
Designated bridge has priority 4105, address 0023.04ee.be01 <--- Root Virtual Bridge ID
Designated port id is 128.4105, designated path cost 0, Topology change is set
Timers: message age 15, forward delay 0, hold 0
Number of transitions to forwarding state: 2
Link type is point-to-point by default
BPDU: sent 119, received 4867
SW-2# show span vlan 10 detail
VLAN0010 is executing the rstp compatible Spanning Tree protocol
Bridge Identifier has priority 32768, sysid 10, address 0024.986f.3b43
Configured hello time 2, max age 20, forward delay 15
Current root has priority 4106, address 0023.04ee.be01
Root port is 4105 (port-channel10), cost of root path is 3
Topology change flag not set, detected flag not set
Number of topology changes 6 last change occurred 0:04:36 ago
from port-channel10
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Timers: hello 0, topology change 0, notification 0
Port 4105 (port-channel10) of VLAN0010 is root forwarding
Port path cost 3, Port priority 128, Port Identifier 128.4105
Designated root has priority 4106, address 0023.04ee.be01 <--- Root Virtual Bridge ID
Designated bridge has priority 4106, address 0023.04ee.be01 <--- Root Virtual Bridge ID
Designated port id is 128.4105, designated path cost 0, Topology change is set
Timers: message age 17, forward delay 0, hold 0
Number of transitions to forwarding state: 2
Link type is point-to-point by default
BPDU: sent 96, received 5179
Vea el Id. de bug Cisco CSCub74914: Las pseudo prioridades STP establecidas incorrectamente en el vPC conectan en configuración del par-Switch
Actualmente, no hay un procedimiento de verificación disponible para esta configuración.
Actualmente, no hay información específica de troubleshooting disponible para esta configuración.