Re: Why Can not configure trunk on this interface

Did you set "switchport tunk encapsulation <dot1q | isl >
Then try setting mode to trunk .

Thnx
Gaurav Madan

On Sun, Nov 21, 2010 at 7:30 PM, 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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Received on Sun Nov 21 2010 - 19:46:55 ART