This object indicates the network layer for which
the CPU rate limiters are applied.
'layer2' - Layer 2.
'layer3' - Layer 3.
'layer2Input' - Ingress Layer 2.
Applicable for devices which support
CPU rate limiters on the Ingress Layer 2
traffic.
'layer2Output' - Egress Layer 2.
Applicable for devices which support
CPU rate limiters on the Egress Layer 2
traffic.