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Beginner

Active active load balancing to ISP with 4200 ISR

Dear support,

 

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.

 

Regards,

Isaac.

 

 

Everyone's tags (3)
4 REPLIES 4
Beginner

Re: Active active load balancing to ISP with 4200 ISR

Yep, you can use PBR and apply NAT to load balance these two default routes  see below for config example:

https://supportforums.cisco.com/document/32186/dual-internet-links-nating-pbr-and-ip-sla

 

Please rate the post if find it useful.

 

Thanks

** Please rate this post or accept the solution if it helped! :) **
VIP Advocate

Re: Active active load balancing to ISP with 4200 ISR

Hi,

Configuration as like:

ip sla 1
icmp-echo 1.1.1.1
timeout 500
frequency 3
ip sla schedule 1 life forever start-time now

ip sla 2
icmp-echo 2.2.2.2
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 1.1.1.1 track 10 
ip route 0.0.0.0 0.0.0.0 2.2.2.2 track 20

 And Suppose 1.1.1.1 is the default gateway if  ISP 1 and 2.2.2.2 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.

 

 

Regards,
Deepak Kumar,
Don't forget to vote and accept the solution If this comment will make help you!
VIP Advisor

Re: Active active load balancing to ISP with 4200 ISR

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.

 

 

 

BB
*** Rate All Helpful Responses ***
Beginner

Re: Active active load balancing to ISP with 4200 ISR

Hi Balaji,

I will be having static routes to two different ISPs,links are on different speeds. thanks for the response.

 

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