01-26-2007 11:42 AM - edited 07-03-2021 01:32 PM
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.
01-27-2007 01:45 PM
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".
01-30-2007 02:09 AM
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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