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New Member

VLAN Routing

I have this situation that goes like this

We have a network 10.10.10.0/24 ( VLAN 10) and 10.10.11.0/24, 172.30.0.0/16 secondary( VLAN 11) as vlan addresses which communicate with each other via MSFC.

There is another network 10.104.0.0/16 on another router with Primary address10.104.240.2/20 and 172.30.2.20/16 as secondary address. These are also on VLAN 11. So in effect, all those on network 10.10.11.0 can reach the 10.104 network when we add static route to devices on the VLAN 11 network as their gateway is a firewall in that address range so we add a static route to the 10.104.0.0 network.

Pldease how do I make devices on Vlan 10 get to the 10.104.0.0/16 network.

I tried putting a secondary address in the range 172.30.0.0 network on the VLAN 10 just like VLAN 11 but it will not accept it and keeps saying the address alreadsy exists on VLAN 11 which it does.

Please help.

2 REPLIES
Cisco Employee

Re: VLAN Routing

It is a bit hard to follow your description, so let me know if my analysis of it is incorrect.

It looks like you have overlapping IP subnets in vlan 11, is that correct?

ie, all these subnets are in vlan 11:

10.104.0.0/16

10.10.11.0/24

172.30.0.0/16

And your problem is that from 10.10.10.0/24 in vlan 10 you can't access the 10.104.0.0/16 subnet, correct?

So there are really two things you need:

- a route to 10.104.0.0/16 in the MSFC where vlan 10 is configured

- a route to 10.10.10.0/24 in the other router where your 10.104.0.0/16 subnet is configured

New Member

Re: VLAN Routing

Thanks.

On the Switch with MSFC, we have

A

In VLAN 11, we have 2 network

10.10.11.0/24,

172.30.0.0/16 sec

B

In Vlan 10, we have

10.10.10.0/24

On a separate Router

C

and then we have a router plugged into the Switch with addresses

10.104.240.2/20

172.30.2.20/16 sec - Vlan 11.

Thereby devices on A are able to communicate with devices on C via the 172.30.x.x addresses.

When I try to put in a sec address for 172.20 onto VLAN 10, it does not accept it as it says, the address range is already on VLAN 11.

What I want is for devices on B to be able to communicate with devices on the 10.104.240.x network.

Please let me know if you need any more information. This is really driving me ......

Thank you.

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