The mode by which inbound ICMP traffic on this port will
Rate-Limited. If icmpRateLimitPerPortOnly is configured,
there will be a single maximum percentage-based rate for
the entire port. If icmpRateLimitPerPortOnlyKbpsMode is
configured, there will be a single maximum kilobits-per-
second rate for the entire port. When ICMP rate-limiting
is disabled, there are no maximum controls on inbound
ICMP traffic for this port.