If we have two different leased line links from two different service provider and they are reaching to my remote branch network from HQ. Network looks as below.
R Router1--isp1--R1--core sw1---HQ
R Router1--isp2--R2--core sw1---HQ
My question is how R1 or R2 discover that the link of respective ISP is gone down even the next hop public ip address of ISP is PINGable or reachable to switchover to the backup link if we are using any Dynamic or Static routing redundancy method at router level?
In addition, incase of dynamic routing how the protocol use the method to find out the status of any link.
Assuming you're using the links in primary and backup mode, by the look of things I think you can do:
Run dynamic routing protocols (BGP) on all routers, tweak:
1. R2 to have lower HSRP priority
2. R2 to have lower preference path (eg inject extra BGP AS number is its advertisement)
route-map SetPath permit 10
set as-path prepend 65000 65000
router bgp 65000
neighbor 188.8.131.52 route-map SetPath out
where 184.108.40.206 is directly connected IP on isp2.
I don't think you'll need to tweak anything at Core routers since they should automatically learn the advertised routes from remote site.
LAN devices will follow HSRP device and be routed to Core automatically. If isp1 goes down, the changes will be detected automatically and switched over to isp2. You'll have to test and time the convergence. Mine is about 60-70 seconds before the site is available again.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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