Estou tentando conectar (2) o Cisco Catalyst 2950 em cada uma das respectivas portas FastEthernet 0/1, mas, por algum motivo, elas não estão se comunicando. Estou fazendo isso para estender fisicamente minha rede e adicionar mais portas de rede.
No SwitchA (10.10.10.1) eu tenho:
!
interface Porth-Channel1
description UPLINK
switchport mode trunk
switchport nonegotiate
flowcontrol send off
end
!
interface FastEthernet0/1
description ETHERNET-UPLINK
switchport mode trunk
channel-group 1 mode active
end
No SwitchB (10.10.10.2) eu tenho:
!
interface Porth-Channel1
description UPLINK
switchport mode trunk
switchport nonegotiate
flowcontrol send off
end
!
interface FastEthernet0/1
description ETHERNET-UPLINK
switchport mode trunk
channel-group 1 mode active
end
Eu tenho a mesma configuração configurada em um 2960 de 8 portas (SwitchC), e se eu ligar FastEthernet 0/1 do SwitchC para SwitchB ou SwitchA, ele funciona. Mas se eu ligar FastEthernet 0/1 de SwitchB para SwitchA, não funciona.
Estou faltando alguma coisa? Como posso obtê-lo para que eu possa conectar 2 switches Cisco 2950 juntos?
UPDATE 1
No SwitchA:
#show int port-channel 1 trunk
Port Mode Encapsulation Status Native vlan
Po1 on 802.1q trunking 1
Port Vlans allowed on trunk
Po1 1-4094
Port Vlans allowed and active in management domain
Po1 1-2,5,30,112,115,120
Port Vlans in spanning tree forwarding state and not pruned
Po1 1-2,5,30,112,115,120
No SwitchB:
#show int port-channel 1 trunk
Port Mode Encapsulation Status Native vlan
Po1 on 802.1q trunking 1
Port Vlans allowed on trunk
Po1 none
Port Vlans allowed and active in management domain
Po1 none
Port Vlans in spanning tree forwarding state and not pruned
Po1 none
Para SwitchB, tentei adicionar todas as vlans a serem permitidas, mas isso não muda nada:
#config t
#int port-channel 1
#switchport trunk allowed vlan all
Eu também tentei:
#switchport trunk allowed vlan 1-4094
Mas a vlan permitida não muda para o que eu digo. Como faço para corrigir isso?
ATUALIZAÇÃO 2
Eu corri um show int po1 switchport
em ambos os switches:
SwitchA
#show int po1 switchport
Name: Po1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: Off
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Protected: false
Appliance trust: none
SwitchB
#show int po1 switchport
Name: Po1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: Off
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Protected: false
Appliance trust: none
Ainda não há nenhuma indicação de por que show int po1 trunk
mostra Vlans allowed on trunk: none