Router Interface binding

[CSCO11638397]

Router 1941 is installed with additional 4 Gig-interfaces card; we have 4 ADSL Router with 4 MB connections. I need to connect all the ADSL connection to the router 4 port and combine them into 16 MB, is there any way to combine 4 Gig interfaces?

[Giuseppe Larosa · Accepted solution]

Hello Mohamed,

all you can do is to use all the 4 DSL lines in parallel but you cannot combine them to make them appear a single link.

You will need 4 default static routes like

ip route 0.0.0.0 0.0.0.0 gi1/0

ip route 0.0.0.0 0.0.0.0 gi1/1

ip route 0.0.0.0 0.0.0.0 gi1/2

ip route 0.0.0.0 0.0.0.0 gi1/3

And you will need appropriate NAT commands to perform NAT of internal source addresses when accessing the internet

ip nat source inside route-map nat-g10 interface gi1/0 overload

ip nat source inside route-map nat-g11 interface gi1/1 overload

ip nat source inside route-map nat-g12 interface gi1/2 overload

ip nat source inside route-map nat-g13 interface gi1/3 overload

where each route-map is like the following:

route-map nat-g10 permit 10

match ip address 10

match interface gi1/0

route-map nat-g11 permit 10

match ip address 10

match interface gi1/1

route-map nat-g12 permit 10

match ip address 10

match interface gi1/2

route-map nat-g13 permit 10

match ip address 10

match interface gi1/3

access-list 10 permit 0.0.0.255

Hope to help

Giuseppe

[CSCO11638397]

Hi Larosa Giuseppe,

Thanks for the reply,

In this scenario the NAT will be done by the edge ADSL routers, and Is that only the 4 static route will be enough for load sharing or need to be add each interface “IP Load-Sharing Destination-Base” command, any other method to accomplish this task!

[CSCO11638397]

Thanks.

[Giuseppe Larosa]

Hello Mohamed,

I'm sorry I had missed your followup question.

Load sharing is achieved with the 4 static default route no special commands are needed in interface configuration mode.

Hope to help

Giuseppe