Load balancing dual Internet, dual Router

[Ha Dao]

Hi expert guys

Is it ok to use 2 internet on time with this topo ?

If yes, how could you do that simplest ?

[lespejel]

Hello Ha

it's possible, but the solution it's very different depending on you design considerations, like:

is you WAN router peering with ISP with BGP? are they injecting IGP default route? core switches are stand alone or working as one unit? etc.

If you are looking for options I recommend you to look for documentation for Dual ISP load balancing.

Now, consider if you need NAT, that will elaborate the solution a little bit more.

https://supportforums.cisco.com/t5/security-documents/loadbalancing-dual-isp-on-asa/ta-p/3127108

http://docwiki.cisco.com/wiki/NAT_failover_with_DUAL_ISP_on_a_router_Configuration_Example

https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13762-40.html

https://www.cisco.com/c/en/us/td/docs/ios/12_2sx/feature/guide/fsxeibmp.html

https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/23675-27.html

http://docwiki.cisco.com/wiki/PfR:Solutions:InternetInboundLoadBalancing

[Ha Dao]

Thank man

My case is simple:

- No BGP with ISP, just NAT

- Core switches are stackable, so they combine into 1 swtich

I consider an other topo

What is better in your opinion ?