I'm trying to connect (2) Cisco Catalyst 2950's over each's respective FastEthernet 0/1 ports, but for some reason, they're not communicating. I'm doing this to physically extend my network and add more network ports.
On SwitchA (10.10.10.1) I have:
!
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
On SwitchB (10.10.10.2) I have:
!
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
I have the same config set up on an 8-port 2960 (SwitchC), and if I plug FastEthernet 0/1 of SwitchC to SwitchB or SwitchA, it works. But if I plug FastEthernet 0/1 of SwitchB to SwitchA, it doesn't work.
Am I missing something? How do I get it so I can connect 2 Cisco 2950 switches together?
UPDATE 1
On 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
On 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
For SwitchB, I've tried to add all vlans to be allowed, but it doesn't change anything:
#config t
#int port-channel 1
#switchport trunk allowed vlan all
I've also tried:
#switchport trunk allowed vlan 1-4094
But the allowed vlan's doesn't change to what I tell it to. How do I fix this?
UPDATE 2
I ran a show int po1 switchport
on both 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
Still no clue as to why show int po1 trunk
shows Vlans allowed on trunk: none
1.
What do you mean they're not communicating? How are they trying to communicate?2.
You probably don't need the ports to be trunk ports unless you have VLAN traffic that needs to transit the two switches (for VLAN's other than the default VLAN).3.
Have you connected a host to both switches to confirm whether or not the hosts can communicate?4.
In their default "out-of-the-box" state it should be a simple matter of connecting the two switches with a network cable.channel-group 1 mode active
andchannel-group 1 mode on
, and neither have made a difference.