【多选题】
A BFD is supported by OSPF, EIGRP, BGP, and IS-IS.
B BFD detects link failures in less than one second.
C BFD can bypass a failed peer without relying on a routing protocol.
D BFD creates one session per routing protocol per interface.
E BFD is supported only on physical interfaces.
F BFD consumes more CPU resources than routing protocol timers do.
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