ISR 4431: Assign IP Address on interface

[Alexandros86]

Hi,

i have a router 4431 and i am trying some old configuration that they gave me for this model.

I have a license securityk9 but except in the interfaces G0/0/0 - 0/0/3 i am not able to assign IP on the int G0/1/0 - 0/1/7 and there is not possible to use right now any SFP.

I enable ip routing and the "no switchport" on the interfaces is not possible.

Any other suggestion? 

Thanks  a lot. 

[MHM Cisco World · Accepted solution]

If port not accept IP address 

Make port l2 via switchport and assign specific vlan to it

Config vlan SVI 

[Alexandros86]

thats was my idea but i still waiting for feedback witch vlans the use and i can take in this case. There is not possible to enable routing on the interface and assign an ip? 

[Stefan Mihajlov · Accepted solution]

@Alexandros86 

It looks like interfaces G0/1/0 - G0/1/7 on the ISR 4431 are part of an internal switch module, which operates as Layer 2 by default, so you cannot directly assign an IP address to them. To work around this, you can create a VLAN interface (SVI) and assign an IP address to it. Use the following commands:

1. Create a VLAN and assign an IP address:
   interface vlan <VLAN-ID> ip address <IP-ADDRESS> <SUBNET-MASK> no shutdown
2. Assign the desired interfaces to the VLAN:
   interface range g0/1/0 - g0/1/7 switchport mode access switchport access vlan <VLAN-ID>

This will allow the VLAN to act as the routed interface for those Layer 2 ports. If you still need routed ports instead of switchports, confirm if a license upgrade or configuration change is required.

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[Alexandros86]

i know this way with vlan, i was not sure if there is another workaround and to activate the l3 on the module.

if not then i will use VLAN.

Thanks