E-series routers implement
a single-rate rate limiter, which you can configure to provide more
efficient service to TCP applications. With the single-rate rate limiter,
when the committed rate is exceeded, the rate limiter drops a single
packet and then resumes transmission up to a configurable burst window.
The single, unacknowledged packet causes TCP to cut its transmission
rate in half rather than falling back to its initial window size.
Note:
Commands that you issue in Rate Limit Profile Configuration
mode do not take effect until you exit from that mode.
The one-rate rate-limit profile attributes are:
Color aware—Color-aware rate action (only for hierarchical
rate limits)
Committed rate—Target rate for a packet flow
Committed burst—Amount of bandwidth allocated to
accommodate bursty traffic in excess of the rate
Excess burst—Amount of bandwidth allocated to accommodate
a packet in progress when the rate is in excess of the burst
Committed action—Drop, transmit, mark (IP and IPv6),
or mark-exp (MPLS) when traffic flow does not exceed the rate; the
mark value is not supported for hierarchical rate limits and the transmit
values conditional, unconditional, or final are only supported on
hierarchical rate limits
Conformed action—Drop, transmit, mark (IP and IPv6),
or mark-exp (MPLS) when traffic flow exceeds the rate but not the
excess burst; the mark value is not supported for hierarchical rate
limits and the transmit values conditional, unconditional, or final
are only supported on hierarchical rate limits
Exceeded action—Drop, transmit, mark (IP and IPv6),
or mark-exp (MPLS) when traffic flow exceeds the rate; the mark value
is not supported for hierarchical rate limits and the transmit values
conditional, unconditional, or final are only supported on hierarchical
rate limits
Mask value—Mask to be applied with mark values for
the ToS byte; applicable only to IP and IPv6 rate-limit profiles;
not supported on hierarchical rate limits
EXP mask value—Mask to be applied with mark-exp
values; applicable only to MPLS rate-limit profiles; not supported
on hierarchical rate limits
