Cisco 3550 - Route on only two VLANS

[ksas025]

I have a Cisco 3550 switch that is divided up into 4 VLANS. Is there a way to only route traffic between 2 of the VLANS? I would like VLANS 1 and 2 to route between each other, but would also like to keep the other two VLANS isolated.

I have seen documentation that allows inter-vlan routing but this is if you want all VLANS to route through one interface.

Is it possible to configure a 3550 to say:

"traffic comming from vlan x route to vlan y?"


Thanks in advance for any replies.

 

[vipergg]

Unless you create a layer 3 interface for them they are isolated . When you create a layer 3 SVI and stick an ip address on it then it will route between the vlans that have a layer 3 definition otherwise they are isolated layer 2 vlans .

 

[lambent]

!
ip routing
!
interface vlan 1
ip address x.x.x.x 255.255.255.0
!
interface vlan 2
ip address y.y.y.y 255.255.255.0
!
interface vlan 3
no ip address
!
interface vlan 10
ip address z.z.z.z 255.255.255.0
shut
!

Say if you have vlan 1 - 10. With this config, routing is only enabled between VLAN 1 and 2.

 

[ksas025]

Thanks a lot for the responses! This should work nicely.