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Trunk link flap bw router and switch

satya mothukuri
Level 1
Level 1

Hi Team,

Iam having problem with trunk link bw rourt and switch, am getting this messages on router.

Jan 11 11:34:48.765 MST: %DTP-5-TRUNKPORTON: Port Fa2 has become dot1q trunk

Jan 11 11:34:48.893 MST: %DTP-5-NONTRUNKPORTON: Port Fa2 has become non-trunk

Jan 11 11:34:50.873 MST: %DTP-5-TRUNKPORTON: Port Fa2 has become dot1q trunk

Jan 11 11:34:51.065 MST: %DTP-5-NONTRUNKPORTON: Port Fa2 has become non-trunk

Jan 11 11:34:52.381 MST: %LINK-3-UPDOWN: Interface FastEthernet2, changed state to up

Router config:

interface FastEthernet2

description connection to c3560-1a1.u71006 switch

switchport trunk allowed vlan 1-4,99,100,195,199,1002-1005

switchport mode trunk

switchport protected

end

version

Cisco IOS Software, C181X Software (C181X-ADVIPSERVICESK9-M), Version 12.4(24)T1, RELEASE SOFTWARE (fc3)
ROM: System Bootstrap, Version 12.3(8r)YH5, RELEASE SOFTWARE (fc1)

System image file is "flash:c181x-advipservicesk9-mz.124-24.T1.bin"

q71006lan1#sh int f2 switchport

Name: Fa2

Switchport: Enabled

Administrative Mode: trunk

Operational Mode: trunk

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: dot1q

Negotiation of Trunking: Disabled

Access Mode VLAN: 0 ((Inactive))

Trunking Native Mode VLAN: 1 (default)

Trunking VLANs Enabled: 1-4,99,100,195,199,1002-1005

Trunking VLANs Active: 1-4,99-100,195,199

Protected: true

Priority for untagged frames: 0

Override vlan tag priority: FALSE

Voice VLAN: none

Appliance trust: none

Swich config:

interface FastEthernet0/24

description uplink to q71006lan1 router

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 1-4,99,100,195,199,1002-1005

switchport mode trunk

switchport nonegotiate

switchport protected

logging event trunk-status

logging event spanning-tree

end

c3560-1a1#       sh int f0/24 switchport

Name: Fa0/24

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)
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 private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: 1-4,99,100,195,199,1002-1005
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

Protected: true
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none

Regards,

Satya.M

2 Replies 2

satya mothukuri
Level 1
Level 1

Hi, plz let me know if any one know wr the issue..

Hi Satya,

Try enabling the "DTP trunk negotiation" on all ports..

Let me know how you go with it.

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