Re: Why Can not configure trunk on this interface

Do this:

sw tr enc dot
sw mo tr
sw noneg

On the interface.

--
Marko Milivojevic - CCIE #18427
Senior Technical Instructor - IPexpert
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:: Sent from my phone. Apologies for errors and brevity. ::
On Nov 21, 2010, at 14:00, Ccieyarub <ccieyarub_at_gmail.com> wrote:
> Hi Guys,
> That could be   simple but I am more used to core routers IOS XR  
> specific than small switches, I would appreciate if some one please  
> let me know why I cannot configure mode trunk on this switch which is  
> connected to ASR 1004  router from the other side. I did not config  
> the interface trunk as Auto and did not config  the dynamic status as  
> below
> Thanks so much
> Bert
> 
> 
> From the switch side here is the error I get on the configs
> Switch(config-if)#switchport mode trunk
> Command rejected: An interface whose trunk encapsulation is "Auto" can  
> not be configured to "trunk" mode.
> Switch(config-if)#switchport au
> Switch(config-if)#switchport noneg
> Switch(config-if)#switchport nonegotiate ?
>   <cr>
> 
> Switch(config-if)#switchport nonegotiate
> Command rejected: Conflict between 'nonegotiate' and 'dynamic' status.
> 
> 
> 
> 
> 
> CONFIGS FOR THE SWITCH C3750
> 
> Switch#show running-config
> Building configuration...
> 
> Current configuration : 1538 bytes
> !
> version 12.2
> no service pad
> service timestamps debug datetime msec
> service timestamps log datetime msec
> no service password-encryption
> !
> hostname Switch
> !
> boot-start-marker
> boot-end-marker
> !
> !
> !
> !
> no aaa new-model
> switch 1 provision ws-c3750-24p
> system mtu routing 1500
> authentication mac-move permit
> ip subnet-zero
> !
> !
> !
> !
> !
> !
> !
> !
> spanning-tree mode pvst
> spanning-tree etherchannel guard misconfig
> spanning-tree extend system-id
> !
> vlan internal allocation policy ascending
> !
> !
> !
> !
> interface Loopback0
> ip address 167.54.4.115 255.255.255.255
> !
> interface FastEthernet1/0/1
> !
> interface FastEthernet1/0/2
> !
> interface FastEthernet1/0/3
> !
> interface FastEthernet1/0/4
> !
> interface FastEthernet1/0/5
> !
> interface FastEthernet1/0/6
> !
> interface FastEthernet1/0/7
> !
> interface FastEthernet1/0/8
> !
> interface FastEthernet1/0/9
> !
> interface FastEthernet1/0/10
> !
> interface FastEthernet1/0/11
> !
> interface FastEthernet1/0/12
> !
> interface FastEthernet1/0/13
> !
> interface FastEthernet1/0/14
> !
> interface FastEthernet1/0/15
> !
> interface FastEthernet1/0/16
> !
> interface FastEthernet1/0/17
> !
> interface FastEthernet1/0/18
> !
> interface FastEthernet1/0/19
> !
> interface FastEthernet1/0/20
> !
> interface FastEthernet1/0/21
> !
> interface FastEthernet1/0/22
> !
> interface FastEthernet1/0/23
> !
> interface FastEthernet1/0/24
> !
> interface GigabitEthernet1/0/1
> switchport trunk allowed vlan 200
> !
> interface GigabitEthernet1/0/2
> !
> interface Vlan1
> no ip address
> !
> ip classless
> ip http server
> ip http secure-server
> !
> !
> ip sla enable reaction-alerts
> !
> !
> !
> line con 0
> line vty 5 15
> !
> End
> 
> 
> From the ASR side
> interface GigabitEthernet1/0/1
> 
> no ip address
> no ip proxy-arp
> negotiation auto
> end
> 
> 
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