Which two control plane policer designs must be considered to achieve high availability? (Choose two.)
A.
Control plane policers are enforced in hardware to protect the software path, but they are hardware platform dependent in terms of classification ability.
B.
Control plane policers are really needed only on externally facing devices.
C.
Control plane policers can cause the network management systems to create false alarms.
D.
Control plane policers must be processed before a forwarding decision is made.
E.
Control plane policers require that adequate protocol overheads are factored in to allow protocol convergence.
A: On most hardware platforms, control plane protection is implemented in hardware to safeguard CPU resources from overload due to excessive control traffic.
E: Control plane policing must be carefully sized to allow sufficient protocol traffic (OSPF, BGP, etc.) during normal and convergence periods to ensure stability.
Why other options are incorrect:
B: Policing should be applied universally, not just on external interfaces.
C: False alarms are operational issues but not design considerations.
D: Control plane policers are applied after forwarding decisions for traffic destined to the router CPU.
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