Cisco 3560 Switch - Disable Routing Between two VLANs

Need to prevent communication between VLAN 2 and VLAN3.  Both need to be able to route out through VLAN 1.

Current IP route statement is 0.0.0.0 0.0.0.0 10.30.1.1

Network 1: 10.30.1.0/24  (VLAN 1)
Network 2: 10.30.10.0/24  (VLAN 2)
Network 3: 10.30.20.0/24  (VLAN 3)

How do I disable routing between VLAN 2 and VLAN 3?  Please provide commands.



LVL 1
ohmErnieAsked:
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Istvan KalmarConnect With a Mentor Head of IT Security Division Commented:
Hi,

you need:
int vlan 2
 ip access-group 101 in
access-list 101 deny ip 10.20.10.0 0.0.0.255 10.30.20.0 0.0.0.255
access-list 101 permit ip any any
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Istvan KalmarHead of IT Security Division Commented:
sorry this acl need for you:

access-list 101 deny ip 10.30.10.0 0.0.0.255 10.30.20.0 0.0.0.255
access-list 101 permit ip any any
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joelvpConnect With a Mentor Commented:
conf t
ip access-list e DENYVLAN3
deny ip any 10.30.20.0 255.255.255.0
permit ip any any

ip access-list e DENYVLAN2
deny ip any 10.30.10.0 255.255.255.0
permit ip any any

int vlan2
ip access-group DENYVLAN3 in

int vlan3
ip access-group DENYVLAN2 in


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joelvpCommented:
Sorry, mine is wrong
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joelvpCommented:
this is what it should have been (but ikalmar already gave the right coding):
conf t
ip access-list e DENYVLAN3
deny ip any 10.30.20.0 0.0.0.255
permit ip any any

ip access-list e DENYVLAN2
deny ip any 10.30.10.0 0.0.0.255
permit ip any any

int vlan2
ip access-group DENYVLAN3 in

int vlan3
ip access-group DENYVLAN2 in

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ohmErnieAuthor Commented:
How would I change this to a permit only?  Say I only want the network x.x.x.x to have access to 10.30.20.0/24 and deny everything else.
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Istvan KalmarHead of IT Security Division Commented:
access-list 102 permit ip x.x.x.0 0.0.0.255 10.30.20.0 0.0.0.255
access-list 102 deny ip any any
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joelvpCommented:
the line
access-list 102 deny ip any any
is not needed as it is implicit

and you would need to code also:
int vlan3
ip access-group 102 out
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ohmErnieAuthor Commented:
If I have two 3560g switches connected via a SFP GB Module, do I need to create this list on both switches?
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joelvpCommented:
On which of the switches are the vlan interfaces defined? Or are you using HSRP? In the latter case you would have to do the job on both switches, otherwise the switch on which the interfaces are defined is sufficient.
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Istvan KalmarHead of IT Security Division Commented:
please show booth switches config..

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