Is it possible to have active active default routes on an ISR 4200 router to two different internet service providers? Kindly share any sample configuration if possible.
Yep, you can use PBR and apply NAT to load balance these two default routes see below for config example:
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Configuration as like:
ip sla 1 icmp-echo 220.127.116.11 timeout 500 frequency 3 ip sla schedule 1 life forever start-time now ip sla 2 icmp-echo 18.104.22.168 timeout 500 frequency 3 ip sla schedule 2 life forever start-time now ! track 10 rtr 1 reachability delay down 10 up 10 track 20 rtr 2 reachability delay down 10 up 10 ! ip route 0.0.0.0 0.0.0.0 22.214.171.124 track 10 ip route 0.0.0.0 0.0.0.0 126.96.36.199 track 20
And Suppose 188.8.131.52 is the default gateway if ISP 1 and 184.108.40.206 is the default Gateway of ISP2.
Here, If you will face some issue, as Some website is not working then it must enable load balancing as per source or destination using the CEF.
Before addressing the issue, do we need some more information, is this any EBGP/ or static route involved?
Both the links from the same provider ? or different providers? are these links are the same speed.
There are a couple of approaches i can think to best utilize is, split the load into different ISP using your Local subnet or application-based. and do IP SLA tracking and failover link to each other if of the active link fails.
I will be having static routes to two different ISPs,links are on different speeds. thanks for the response.