Routing on L3 switch with fixed static ip to laptop user accessibility frm any switch

[nilesh.varade]

Client is having following setup:

1. 3 floors

2. each floor is having 4500 series switches 2nd-4th floor

3. 2nd floor is having core switch 4510

4. all 4500 series switches is having IP base IOS image

5. All are connected to each other in Ring topology with 10G fiber uplinks

6. all are connected to each other as L3 switching by RIP (acts as a seperate router)

7. each switch is having seperate IP subnet

8. All will get IP address from DHCP server which is connected on 2nd floor Core switch

Query:

Client wants some of his laptop users can connect on each floor with his Static ip address as assinged.

Then wat solution we can give.

Alternate options are also needed for his query.

[ashok_boin]

It's possible if you have a single VLAN spread across throughout the above setup. Just exclude the IP Addresses from DHCP Subnet scope on DHCP server or Cisco router (acting as DHCP server) and assign one of excluded IP addresses as static IP to the laptop.

Regards...

-Ashok.

[Dennis Mink]

If you have all you 4500 floor swithes in differnt subnets, you cant plug a laptop with a static IP address into any port on any floor. it just wont work, because your static IP will most likely land in the wrong VLAN.

only thing you could do is assign certain designated ports on each floor to the VLAN of which the laptop's static IP address is a member of.

R.,

[nilesh.varade]

Thanks minkdennis.

I couldnt get...

could you please elaborate as u said in your post

[nilesh.varade]

any body can guide on this??

[Jon Marshall]

If you want the laptop to keep the same IP address then you need to have the same vlan on all switches. So if the user is in vlan 10 on floor 2 and they move to the 3rd floor then you need to have vlan 10 on the 3rd floor switch.

You then need to configure the port the user connects to be in vlan 10.  You also need to reserve the laptop IP address on the DHCP server(s) so that no other client can get that address.

If your switches are connected with L2 links then you can do this. If your switches are connected with L3 links then you can't do it.

Note also that you can do dynamic vlan assignment if you have an ACS server which means you wouldn't have to manually configure the port, instead the user logs into the network and gets assigned to the correct vlan. This is a lot more configuration though and you need an ACS server. Even with this option you still need the switches to be connected by L2 links.

Jon