Traffic engineering autobandwidth samples the average output rate for each tunnel marked for automatic
bandwidth adjustment. For each marked tunnel, it periodically (for example, once per day) adjusts the
tunnel’s allocated bandwidth to be the largest sample for the tunnel since the last adjustment.

The frequency with which tunnel bandwidth is adjusted and the allowable range of adjustments is
configurable on a per-tunnel basis. In addition, the sampling interval and the interval over which to
average tunnel traffic to obtain the average output rate is user-configurable on a per-tunnel basis.

Benefits

The automatic bandwidth feature makes it easy to configure and monitor the bandwidth for
Multiprotocol Label Switching (MPLS) traffic engineering tunnels. If automatic bandwidth is
configured for a tunnel, traffic engineering automatically adjusts the the tunnel’s bandwidth.

Restrictions

The automatic bandwidth adjustment feature treats each tunnel for which it has been enabled
independently. That is, it adjusts the bandwidth for each such tunnel according to the adjustment
frequency configured for the tunnel and the sampled output rate for the tunnel since the last adjustment
without regard for any adjustments previously made or pending for other tunnels.

Related Features and Technologies

The automatic bandwidth feature is related to:

•

MPLS traffic engineering

•

Resource Reservation Protocol (RSVP)