1. tweak BGP timers (Hello, Advert, Scan)
2. rely on IGP (fine tune IGP first)
bgp fast-external-fallover (default enable for eBGP)
bgp nexthop trigger delay delay-timer (seconds)
3. enable BFD
neighbor 1.1.1.1 fall-over bfd
4. allow multiple paths in BGP
a) using different RD (MP-BGP)
b) different RRs has different perference for a prefix
c) BGP The “Add Paths” capability
Very good reference:Understanding BGP Convergence
BGP Commands:
BGP Support for Next-Hop Address Tracking
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