01-19-2016 10:06 PM - edited 03-08-2019 03:28 AM
So we're finally replacing an old Cisco 2801 router with a fancy new ISR 4431. However we've been caught out, the old 2801 had access vlans assigned to physical interfaces and it seems this is a no-no on a 4431.
Is our only solution to put in a switch module?
Below is what we used to have.
interface FastEthernet0/3/0
description FW
switchport access vlan 202
duplex full
speed 100
!
interface FastEthernet0/3/1
description FW
switchport access vlan 202
duplex full
speed 100
!
interface Vlan202
ip address 192.168.0.5 255.255.255.0
!
Solved! Go to Solution.
01-20-2016 01:03 AM
Hey
so you probably had a hwic switching module in the 2801 , these 4431 are pure layer 3 you would need to add a module if supported to get layer 2 port access like that
Looking at this comparison model it says no to switch module but there not always accurate I would check with the supplier you got it from ask them are there l2 modules available for this switch , other option push the vlans back onto a layer 3 switch and route between switch and router or use old method router and stick setup with l2 switch
http://www.cisco.com/c/en/us/products/routers/4000-series-integrated-services-routers-isr/models-comparison.html
01-20-2016 01:03 AM
Hey
so you probably had a hwic switching module in the 2801 , these 4431 are pure layer 3 you would need to add a module if supported to get layer 2 port access like that
Looking at this comparison model it says no to switch module but there not always accurate I would check with the supplier you got it from ask them are there l2 modules available for this switch , other option push the vlans back onto a layer 3 switch and route between switch and router or use old method router and stick setup with l2 switch
http://www.cisco.com/c/en/us/products/routers/4000-series-integrated-services-routers-isr/models-comparison.html
01-20-2016 02:08 AM
Thanks Mark,
You're exactly right, we have overlooked that our old routers have a HWIC-4ESW switching module. We'll procure some NIM-ES2-4 modules for the new 4431 routers.
04-15-2016 05:16 AM
Did this work for you? I'm in a similar situation.
I see where the url referenced above shows N/A for switched Ethernet ports for the 4431. However, as you apparently noticed as well, other documentation shows the NIM-ES2-4 and NIM-ES2-8 supported in the ISR 4431.
04-17-2016 04:02 PM
Hi Mike,
Yes, using the NIM-ES2-4 module worked for us. We did need to upgrade the IOS-XE (I think) version, but afterwards we were able to apply a vlan to the interfaces without issue.
02-05-2019 04:27 PM
Hi Mark,
I have a similar situation. I need to create L3 vlans on cisco isr 4431. My uplink is a switch and my down link is also a switch so in this case the router on stick method is going to work? Or what other options i have. Also i have 2 ISR's in between on which i need to configure redundancy groups for HA.
06-12-2021 12:51 AM
Thank's
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