Cisco 3550 switch connectivity problem
Hi all ,
I have strange issue in my lab , it made me crazy
I have connectivity problem between tow of 3550 switches, bet when i connect on of them to 3560, the trunk port work correctly.
I connected to switches on 0/17 port.
See configuration bellow :
sw2
SW2#show int fastEthernet 0/17 switchport
Name: Fa0/17
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
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 Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none
SW2#show int fastEthernet 0/17 status
Port Name Status Vlan Duplex Speed Type
Fa0/17 notconnect 1 auto auto 10/100BaseTX
_______________________________________________
sw3
sw3#show interfaces fastEthernet 0/17 switchport
Name: Fa0/17
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Voice VLAN: none (Inactive)
Appliance trust: none
sw3#show interfaces fastEthernet 0/17 status
Port Name Status Vlan Duplex Speed Type
Fa0/17 notconnect 1 auto auto 10/100BaseTX
Plz help me i need solution i cann't practice switche labs.
Comments
I think you need a crossover cable between 3550 switches as they don't support auto MDIX.
Take a look at this post - http://ieoc.com/forums/p/4536/14719.aspx
Yep you need crossover cables with those switches where thepins 1,2 are connected to 5,6 and vice versa.
Here is the link to cisco where you can see that the 3550 doesnt support auto mdi-x:
http://www.cisco.com/en/US/products/hw/switches/ps646/prod_bulletin09186a00801a759a.html#wp39124
Regards!
Markus
But when i connect one of them to 3560 it works well !!!
I will make a cross cable and i hope to resolve an issue
Thanks all ,
You need physical crossover cables between the 3550s. The 3560s have Auto-MDIX so both a straight through and a crossover cable will work. 3550s don’t support this so you need crossovers.
Brian McGahan, CCIE #8593 (R&S/SP/Security)
[email protected]
Internetwork Expert, Inc.
http://www.INE.com
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From: [email protected] [mailto:[email protected]] On Behalf Of Yousif
Sent: Saturday, August 04, 2012 5:45 PM
To: Brian McGahan
Subject: [hardware] I need help about 3550 switch
Hi all ,
I have strange issue in my lab , it made me crazy
I have connectivity problem between tow of 3550 switches, bet when i connect on of them to 3560, the trunk port work correctly.
I connected to switches on 0/17 port.
See configuration bellow :
sw2
SW2#show int fastEthernet 0/17 switchport
Name: Fa0/17
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
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 Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none
SW2#show int fastEthernet 0/17 status
Port Name Status Vlan Duplex Speed Type
Fa0/17 notconnect 1 auto auto 10/100BaseTX
_______________________________________________
sw3
sw3#show interfaces fastEthernet 0/17 switchport
Name: Fa0/17
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Voice VLAN: none (Inactive)
Appliance trust: none
sw3#show interfaces fastEthernet 0/17 status
Port Name Status Vlan Duplex Speed Type
Fa0/17 notconnect 1 auto auto 10/100BaseTX
Plz help me i need solution i cann't practice switche labs.
INE - The Industry Leader in CCIE Preparation
http://www.INE.com
Thanks for help