BGP multihoming - best scenario for upstream failure?
I’m currently configuring a bgp multihoming environment ( two ISP’s - one primary and the other as a backup) I'm advertising my public /24 with my own ASN via BGP to both ISPs.I am only receiving a default route from both of my ISPs and running iBGP between my two edge routers. If the physical link fails between my ISP1(primary) the traffic switches to the secondary with no problems.
Here is the question and my concern:what would happen if ISP1 (primary) had a problem upstream beyond my physical link? Since am only getting their default route, would this mean that I will still be sending traffic since my edge routers are not seeing any issues? And what is the best way to avoid this scenario?
Re: BGP multihoming - best scenario for upstream failure?
You probably do not need BGP for your setup since you are not receiving any prefixes from either ISP and you are using only as single inbound/outbound path at a time.
You could probably get away with IP SLA static route tracking and monitoring.
Pick a known good and pingable upstream destination. Destination should be passed your ISP and of course the ISP must allow icmp to/from this destination. When the upstream destination is no longer available, IP SLA tracking will automatically pull the "downed" static router from the routing table (in your case 0.0.0.0/0 to IPS A) and insert 0.0.0.0/0 to IPS B.
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