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BGP session brought down by hold timer expiry instead of lost route to peer when fall-over is configured
Only happens when a static route is configured to the neighbor through an interface, a Null0 static route is configured in the same subnet, and the interface is taken down
Avoid using static routes with Null0 interface in the same subnet as a BGP neighbor configured to a specific interface if fall-over is configured. Usage of a static Null0 route in the same subnet as a BGP neighbor that is NOT configured to a specific interface will work with fall-over as expected. Example: Prefer: ip route 10.10.10.0 255.255.255.252 Null0 254 ip route 10.10.10.2 255.255.255.255 10.10.10.2 Instead of: ip route 10.10.10.0 255.255.255.252 Null0 254 ip route 10.10.10.2 255.255.255.255 Ethernet0/0 10.10.10.2
This issue does not affect recursive static routes (i.e. physical interface not specified)
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