10-27-2013 08:16 PM - edited 03-07-2019 04:16 PM
I have an 8 port L2 switch which has 3 ports in VLAN 10 and 4 ports in VLAN 20
Port 1 of the switch is a trunk port connect to FastEthernet 0 of my Cisco router which is doing inter VLAN routing between both VLANs by using the following commands
interface FastEthernet0.10
encapsulation dot1Q 10
ip address 192.168.0.1 255.255.255.0
!
interface FastEthernet0.20
encapsulation dot1Q 20
ip address 10.10.0.1 255.255.0.0
The router also has 8 switch ports and I would like to assign 2 ports to VLAN 10 and another 2 to VLAN 20.
If I do the following, does it do what I want?
interface Vlan10
no ip address
!
interface Vlan20
no ip address
!
interface FastEthernet1
switchport access vlan 10
no ip address
!
interface FastEthernet2
switchport access vlan 10
no ip address
!
interface FastEthernet3
switchport access vlan 20
no ip address
!
interface FastEthernet4
switchport access vlan 20
no ip address
Thanks.
Solved! Go to Solution.
10-27-2013 09:35 PM
If fe0 can be a trunk port, then remove the sub interfaces, put in switchport mode trunk and put the ip addresses for the 2 Vlans on the svis.
Sent from Cisco Technical Support iPad App
10-27-2013 08:47 PM
You need to list the model numbers of the equipment and the software versions. There are different answers depending on those factors, but if you're running an older router like I think you are, you're most likely going to have to cross-cable the 2 switches and get rid of the svis on the router.
Sent from Cisco Technical Support iPad App
10-27-2013 08:54 PM
The router is an 1801 running IOS 15.1. It has 9 switch ports with FE0 capable of being used as a trunk port.
The switch is a TP Link SG3210 layer 2 managed switch.
10-27-2013 09:35 PM
If fe0 can be a trunk port, then remove the sub interfaces, put in switchport mode trunk and put the ip addresses for the 2 Vlans on the svis.
Sent from Cisco Technical Support iPad App
10-28-2013 05:15 PM
Thanks!
I cannot use FE0 as a trunk port only divide it into subinterfaces, but you've helped me get the SVI vlans working by using one of the switchports (fa1 - 8 ) as a trunk.
This is how I originally tried to get intervlan routing working but couldn't and found the subinterface method.
Here's a test solution in case anyone else has this problem
On the layer 2 switch, Ive plugged a NAS storage device (192.168.200.2) into port 7 and set that port as a GENERAL port with a PVID of 50 (Port VLAN ID also known as VLAN ID).
Port 8 is set up as a TRUNK port, trunking PVID 50 and this connects to FE8 on the Cisco which is the corresponding trunk port.
On the Cisco, I have the following config...
vlan 50
name TEST
!
interface FastEthernet8
switchport trunk native vlan 50
switchport mode trunk
no ip address
!
interface Vlan50
description TEST
ip address 192.168.200.1 255.255.255.0
This works great.
One last question, why would someone use subinterfaces or the above method of inter vlan routing?
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