Connecting Two Cisco Routers to one DSL line

[duckandchips]

Hello and Good Afternoon

My internet provider has given me /29 Public IP address range.

I have Two cisco 4K Routers and a 3850 Switch. I would like to use both router to "share" the DSL line with there own public IPs.

My idea is a VLAN and a couple of switch ports on the 3850 to this "VLAN 666_RAW_Internet" , then connect the DSL line and both WAN interface of the 4K with addresses from the /29 range to share this connection.

will this work ? or would have to do more then create a L2 VLAN on the switch to connect all WAN router ports to the internet?

I just need a way to increase the amount of ports that have internet access.

Am I heading in the right direct ? or is there a better/other way?

Any help would be appreciated.

regards

Jason

[jj27]

Yes, that is a perfectly acceptable way of doing it and is a common practice.  

[duckandchips]

Hi

(I have changed the IP address to protect the innocent.)

And would simply assigning a block of ports on the switch as L2 switch ports and the 4K interfaces as routed ports work ? does the VLAN 666 need to be an SVI or something or just standard L2.

>>>3850 switch <<<

interface range gig1/0/1 -3

Dis *** Raw_internet ports***

switchport mode access

switchport access vlan 666

<<<4K Router 1<<<

 interface GigabitEthernet0/0/0
 description ***WAN interface to switchport 1/0/1 ***
 ip address 73.85.268.129 255.255.255.248

<<<4K Router 2<<<

 interface GigabitEthernet0/0/0
 description ***WAN interface to switchport 1/0/2 ***
 ip address 73.85.268.130 255.255.255.248

[jj27]

Just create VLAN 666 on the switch, no SVI necessary.

Your port range commands are correct. I'd add "spanning-tree portfast" to those as well to instantly forward traffic since only routers are connecting to them.

Everything will work as intended.

Commands:

vlan 666
name RAW_INTERNET

interface range g1/0/1 - 3
spanning-tree portfast
switchport mode access
switchport access vlan 666