trunk link port is not comingup

Unanswered Question
Apr 29th, 2009

Hi ,

g0/0 of 3845 router is connected to g3/47 of 3550 switch.

3845 config :

Int g0/0

speed 100

duplex full

int g0/0.11

encapsulation dot1q 11 native

ip address

standby 11 ip

int g0/0.12

encapsulation dot1q 12

ip address

standby 11 ip

4506 switch :

int g3/47

switchport trunk encapsulation dot1q

switchport mode trunk

switchport trunk native vlan 11

switchport trunk allowed vlan 11,12

int vlan 11

ip address

As soon as I connect Gig0/0 of 3845 router to Gig3/47 of 4506 switch, gig ports of both the deives are down and are not coming up.What could be the reason..



I have this problem too.
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davy.timmermans Wed, 04/29/2009 - 02:31

and if you configure speed on the 3845 to auto?

or if you configure both ends to speed 100(0)

smothuku Wed, 04/29/2009 - 03:34

Hi ,

I tried few combinations by chaning the speed and duplex settings...after that also ports are not coming up...



smothuku Wed, 04/29/2009 - 03:52

yah am using machine crimped straight cable..



glen.grant Wed, 04/29/2009 - 04:59

IS the module you are trying to connect to actually up , do a show mod and make sure it passed diags and looks ok.

Leo Laohoo Wed, 04/29/2009 - 16:10

Hi Satish,

1. Try a different copper cable;

2. A stupid question: On the 4500, VLAN 11 is "no shut"?

3. Anything in the logs of both appliance to explain why the ports are down?


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