%LINEPROTO-5-UPDOWN

Unanswered Question
Jan 26th, 2007
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Hi, I am have problem with Bridge and switch 3550, the port is Down and Up randomly.

Anyone can help?.

config is in the below

interface FastEthernet0/23

switchport trunk encapsulation dot1q

switchport mode dynamic desirable

spanning-tree portfast.


This are the event in sh logg of swith



d06h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/23, changed state to down

d06h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/23, changed state to up

d06h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/23, changed state to down

d06h: %SPANTREE-7-RECV_1Q_NON_TRUNK: Received 802.1Q BPDU on non trunk FastEthe

net0/23 VLAN1.

d06h: %SPANTREE-7-BLOCK_PORT_TYPE: Blocking FastEthernet0/23 on VLAN0001. Incon istent port type.

d06h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/23, changed state to up

d06h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/23, changed state to down

d06h: %SPANTREE-7-RECV_1Q_NON_TRUNK: Received 802.1Q BPDU on non trunk FastEthe

net0/23 VLAN1.

d06h: %SPANTREE-7-BLOCK_PORT_TYPE: Blocking FastEthernet0/23 on VLAN0001. Incon istent port type.

d06h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/23, changed state to up

d06h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/23, changed state to down

d06h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/23, changed state to up

d06h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/21, changed state to down

d06h: %LINK-3-UPDOWN: Interface FastEthernet0/21, changed state to down

d06h: %LINK-3-UPDOWN: Interface FastEthernet0/21, changed state to up

d06h: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/21, changed state to up


La configuraci?n del puerto es :



interface FastEthernet0/23

switchport trunk encapsulation dot1q

switchport mode dynamic desirable

spanning-tree portfast.


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john.preves Sat, 01/27/2007 - 13:45
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change to "switchport mode trunk"...I am not sure what you were hoping to get with "dynamic desirable" (I have to look that up now)

but I'm guessing anything with "dynamic" and "trunk" in it is not very "desireable".

mheusinger Tue, 01/30/2007 - 02:09
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Hello,


what is connected to F0/23 ? Looks like dynamic negotiation does not work properly.

Make sure the other end supports DTP (Cisco proprietary) with your configuration. The general recommendation would be to configure a trunk to not use DTP:


interface fastethernet0/23

switchport trunk encapsulation dot1q

switchport mode trunk

switchport nonegotiate

no shutdown


Basically you should DESIGN, where a trunk is to be found and which port is access port. Either you want a trunk, then configure it like in the config given above. Or you do not want a trunk, then configure an access port.


Regards, Martin

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