Configuração do Par-interruptor do nexo 7000 (instalação híbrida)
Índice
Introdução
Este documento descreve como configurar o par-interruptor no Switches Cisco Nexus série 7000 a fim permitir que as conexões NON-virtuais do Canal de porta (NON-VPC) carreguem o equilíbrio entre VLAN.
Quando o par-interruptor é permitido, cada 7000 Switch do nexo compartilha de um ID de bridge virtual, que permita que ambo o Switches atue como a raiz para o VLAN. Para os dispositivos com uma conexão a cada 7000 Switch do nexo no domínio do vPC que não são capazes da porta que canaliza, a topologia da camada 2 (L2) confia no Spanning Tree Protocol (STP) a fim obstruir os enlaces redundantes. A característica do par-interruptor permite as configurações pseudo--STP permitir que as conexões NON-VPC carreguem estados do equilíbrio STP entre os dois 7000 Switch do nexo. Este documento discute em detalhe a razão para as configurações pseudo--STP e como afetam o NON-VPC e os links do vPC.
Uma mistura de vPC e de links NON-VPC é chamada uma instalação híbrida.
Os endereços MAC para cada interruptor usado no exemplo de configuração neste documento são:
- VPC Switch1 do nexo 7000 (N7K-1): 00:24:98:6f:3b:41
- VPC Switch2 do nexo 7000 (N7K-2): 00:24:98:6f:3b:42
- NON-VPC Switch1 (SW-1): 00:24:98:6f:3b:44
- NON-VPC Switch2 (SW-2): 00:24:98:6f:3b:43
Pré-requisitos
Requisitos
A Cisco recomenda que você tenha conhecimento destes tópicos:
- STP (Spanning Tree Protocol)
- Canal da porta virtual (vPC)
Componentes Utilizados
A informação neste documento é baseada no Switches Cisco Nexus série 7000 com módulo do Supervisor 1.
As informações neste documento foram criadas a partir de dispositivos em um ambiente de laboratório específico. Todos os dispositivos utilizados neste documento foram iniciados com uma configuração (padrão) inicial. Se a sua rede estiver ativa, certifique-se de que entende o impacto potencial de qualquer comando.
Configurar
Comportamento normal do vPC para a instalação híbrida
Este é um diagrama da rede de uma instalação híbrida sem par-interruptor permitido. Ambos os 7000 Switch do nexo são configurados com uma prioridade de 8192 para todos os VLAN. N7K-1 ganha a eleição da ponte porque tem o ID de bridge mais baixo. Consequentemente, você espera SW-1 obstruir no link de N7K-2. SW-2 é conectado aos 7000 Switch do nexo através de um vPC e estará em um estado da transmissão. SW-2 recebe o bridge protocol data units (BPDU) somente do interruptor preliminar no vPC, que é N7K-1 neste exemplo.
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
Permita o Par-interruptor em ambo o Switches do nexo
Este é um diagrama da rede do uma instalação híbrida com o par-interruptor permitido. Quando o par-interruptor é permitido, cada 7000 Switch do nexo compartilha de um ID de bridge virtual que permita que ambo o Switches atue como a raiz para o VLAN. O par-link do vPC está sempre em um estado da transmissão e executa o protocolo da interconexão do gateway L2 (L2GIP) a fim impedir Loop de Bridging.
Cada 7000 Switch do nexo envia BPDU com um bridge-raiz identificado pelo ID de bridge virtual. Nos links do vPC, o bridge designada ID igualmente usa o ID de bridge virtual. Para os links NON-VPC, o bridge designada ID é o ID de bridge físico do 7000 Switch correspondente do nexo. Isto permite que o interruptor NON-VPC (SW-1) faça uma decisão da raiz baseada em propagandas BPDU em vez da prioridade de porta.
conexão NON-VPC
Com o par-interruptor permitido, cada 7000 Switch do nexo gerencie BPDU com o grupo do bridge-raiz ao ID de bridge virtual e ao bridge designada ajustados ao ID de bridge físico. Desde que as prioridades são as mesmas, todas as conexões NON-VPC sempre dianteiras no link conectado ao 7000 Switch do nexo com o ID de bridge mais baixo (N7K-1 neste exemplo) e ao bloco nos links conectaram ao 7000 Switch do nexo com o ID de bridge mais alto (N7K-2 neste exemplo).
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
conexão do vPC
Com o par-interruptor permitido, as conexões do vPC recebem BPDU com o bridge-raiz e o bridge designada ajustados ao ID de bridge 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
Permita o Balanceamento de carga entre VLAN nos links NON-VPC
Sob a configuração do par-interruptor do padrão, todos os VLAN no interruptor NON-VPC estão enviando em um link único. A fim carregar o equilíbrio entre os VLAN, designada e as prioridades de raiz anunciadas podem manualmente ser ajustadas por meio da medida - configurações da pseduo-informação da árvore. Cisco recomenda que a prioridade de raiz sob a pseduo-informação seja mais baixa do que o melhor que mede - prioridade da árvore a fim impedir as notificações da alteração de topologia (TCN) sob circunstâncias do Failover. As prioridades designadas podem ser carga equilibrada entre os dois 7000 Switch do nexo no domínio do vPC.
Neste exemplo, a medida global - as prioridades da árvore em ambos os 7000 Switch do nexo foram ajustadas a 8192. Sob a pseudo--informação, a prioridade de raiz foi configurada como 4096, que é mais baixa do que a melhor prioridade de 8192. Consequentemente, o interruptor que está participando com o par-interruptor permitido transforma-se a raiz para o VLAN. A fim carregar o equilíbrio entre os dois Switches, as prioridades designadas são alternadas para VLAN 9 e VLAN10. Para as conexões NON-VPC a SW-1, o VLAN 9 é enviado no link a N7K-1, e o VLAN10 é enviado no link a N7K-2.
conexão NON-VPC
Para VLAN 9, SW-1 vê a prioridade de Root Bridge e o ID de bridge pseudo- como o mesmo valor de N7K-1 e de N7K-2. Contudo, N7K-1 e N7K-2 enviam suas prioridades designadas pseudo- configuradas. Consequentemente, SW-1 vê a prioridade do bridge designada de 8201 (8192 + 9) de N7K-1 e a prioridade do bridge designada de 12297 (12288 + 9) de N7K-2; SW-1 escolhe o link para N7K-1 como o link de transmissão em VLAN 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
Similarmente para o VLAN10, SW-1 vê a prioridade de Root Bridge e o ID de bridge pseudo- como o mesmo valor de N7K-1 e de N7K-2. Além disso, N7K-1 e N7K-2 enviam suas prioridades designadas pseudo- configuradas. Para o VLAN10, SW-1 vê a prioridade do bridge designada de 12298 (12288 + 10) de N7K-1 e a prioridade do bridge designada de 8202 (8192 + 10) de N7K-2; SW-1 escolhe o link para N7K-2 como o link de transmissão para VLAN 10. desta maneira, os switch conectados NON-VPC podem carregar o estado do equilíbrio VLAN STP entre N7K-1 e 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
conexão do vPC
Para os links do vPC, a raiz e o uso designado dos campos a prioridade de raiz pseudo- e o ID de bridge 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
Caveats
Veja a identificação de bug Cisco CSCub74914: As prioridades do STP pseudo- ajustadas incorretamente no vPC ligam na instalação do par-interruptor
Verificar
No momento, não há procedimento de verificação disponível para esta configuração.
Troubleshooting
Atualmente, não existem informações disponíveis específicas sobre Troubleshooting para esta configuração.
Informações Relacionadas
- Guia de configuração da interface do 7000 Series NX-OS do nexo de Cisco, liberação 5.x: Configurando vPCs: interruptor do par do vPC
- Projeto e manual de configuração: Melhores prática para os canais da porta virtual (vPC) no Switches Cisco Nexus série 7000
- Suporte Técnico e Documentação - Cisco Systems
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