Inquiry on Best Solution for Site Connectivity

[ALI12]

Hi Team,

Could you please advise on the best practices for the following scenario (as shown in the attached diagram)?

We have two sites connected by leased lines from two different ISPs.

What would be the best solution to ensure continuous connectivity between the sites in case one of the ISPs goes down?

Would using IP SLA with static routes or OSPF HA be more effective or anything else?

[MHM Cisco World]

For me 

I think two defualt route one with high AD and other using ip sla is best solution.

Note:- using default route with ip sla need to done in both site.

Running ospf I think not possible since ISP router reject form IGP with costumers routers

MHM

[ALI12]

Thanks Prof @MHM Cisco World for your input,
I actually shared the same opinion, however, my manager does not recommend using the static route.

[paul driver · Accepted solution]

Hello
you do not mention what type is circuit you have - l2/l3vpn - internet ?
Do you have administrative control of the rtrs at both sites?
if you can run any routing process - i would say for fastest convergence invoke eigrp ( if you are running all cisco) plus it supports unequal load balancing 
Ospf if you have mutu-vendor hardware it’s not as fast as eigrp but i’d say is better for segmentation of your network and path manipulation
BGP is the overall best routing process - it not designed for fast convergence but is the best in terms of traffic control -best path determination - stability 

If you can elaborate a little further on your network -expectations maybe a recommendion could be provided?

[ALI12]

Thank you @paul driver for the great information.
and for clarification:
-you do not mention what type is circuit you have - l2/l3vpn - internet ?  yes

-Do you have administrative control of the rtrs at both sites? yes

-All equipment is running Cisco.

[paul driver]

Hello

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@ALI12 wrote:
Thank you @paul driverfor the great information.
and for clarification:
-you do not mention what type is circuit you have - l2/l3vpn - internet ?  yes

So which is it, do you have any internet break out, I assume you would have and possibly at each location?
Do you have any cloud services/vpn etc.. needing internet access?

If applicable,I wound look into BGP (private ASNs) for inter-site connectivity , Using an igp (ospf)  internally,  it will be scalable plus this way each site will be under its own administrative domain and control.

[ALI12]

Thanks @paul driver 

Thank you for your help.
As you mentioned in previous reply, I believe the best solution is to implement EIGRP, especially  it supports unequal load balancing effectively.

I appreciate your input!

[MHM Cisco World]

You cant do anything without ask ISP' 

ISP guide you what you use' and I guess they will suggest defualt static route.

MHM

[ALI12]

@MHM Cisco World 

Some ISPs might not allow this configuration.

However, I have successfully set up OSPF on one of the ISPs, and it is currently operational.

#show ip ospf nei det | i Neighbor|Neighbor.is
Neighbor priority is 1, State is FULL, 6 state changes
Neighbor is up for 2d02h

Thanks mate for usual support