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Unable to configure Vlan1: Invalid input detected at '^' marker

csasaki
Beginner
Beginner

HI,

 

We just got an ISR 4331 and I am in the process of configuring it. 

However, when I try to access interface Vlan 1, I am unable to access interface Vlan 1:

 

RTR(config)#interface vlan1
                                   ^
% Invalid input detected at '^' marker.

 

I can access interface Vlan 1 on another pre-configured router with the same command so I am not sure if I missed something in configuration? Also, I can access vlan 1 but not through the interface command:

 

RTR(config)#vlan 1

RTR(config-vlan)#

 

Could someone help me, please? Thanks.

1 Accepted Solution

Accepted Solutions

RTR(config)# interface vlan1

and 

RTR(config)# vlan 1

are different commands

the first configures an interface for the vlan so you can give it an ip-address

the second configures a vlan so you can give it a name, not an ip-address

try show vlan and show interface vlan [n] on both routers 

 

if a router is a real router (L3 device) , then it does not know about vlan's (L2 ) !

however it may recognize dot1q encapsulated (sub)interfaces.

you can check the modules installed with show inventory

 

 

View solution in original post

5 Replies 5

luis_cordova
VIP Advisor VIP Advisor
VIP Advisor

Hi @csasak,

 

Is it possible that the switch module is missing from your device? You could check the inventory on your device.

 

Regards

@luis_cordova wrote:

Hi @csasak,

 

Is it possible that the switch module is missing from your device? You could check the inventory on your device.

 

Regards


I had thought about that being the problem but do you know how I could check that? I didn't order this device so I'm not sure what was ordered with it. I've done "show platform" and "show hardware" commands but I don't know what to look for or look at.
 

Kasun Bandara
VIP Advisor VIP Advisor
VIP Advisor
Hi,

you should use space between vlan number and 'vlan' command. check below guide for interface configurations.

https://www.cisco.com/c/en/us/td/docs/app_ntwk_services/data_center_app_services/ace_appliances/vA1_7_/configuration/routing_bridging/guide/rtbrgdgd/vlansif.html#wp1029764

Kasun Bandara
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KB

balaji.bandi
VIP Community Legend VIP Community Legend
VIP Community Legend

Adding to other post check - Confirm that on the inventory of the device. 

If both the device same hardware like the other one working for you,

 

Then follow below guide to configure VLAN :

https://www.cisco.com/c/en/us/td/docs/routers/access/interfaces/eesm/software/configuration/guide/4451_config.html#pgfId-1073928

BB

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RTR(config)# interface vlan1

and 

RTR(config)# vlan 1

are different commands

the first configures an interface for the vlan so you can give it an ip-address

the second configures a vlan so you can give it a name, not an ip-address

try show vlan and show interface vlan [n] on both routers 

 

if a router is a real router (L3 device) , then it does not know about vlan's (L2 ) !

however it may recognize dot1q encapsulated (sub)interfaces.

you can check the modules installed with show inventory

 

 

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