Enterasys Networks 6H302-48 manual Traffic Rate Limiting, Flow Control

Traffic Rate Limiting

The VLAN redirect function is similar to the port redirect function except that the frames received by the module are redirected to a designated destination port according to the VLAN classification of the frames received. Multiple VLANs can be directed to the same destination port. The VLAN redirect function is only supported when the module is operating as an 802.1Q switch.

1.8TRAFFIC RATE LIMITING

The Traffic Rate Limiting feature enables the module to control traffic rates on a per-port, per-priority basis. The network administrator can configure a rate limit (from 100 kbps to 1 Gbps) for a given port with an associated list of IEEE 802.1p priorities (which can include one, some, or all of the eight priority levels defined in 802.1p). Each rate limit is specified as an inbound or an outbound limit. The combined rate of all traffic on the port that matches the listed priorities cannot exceed the programmed limit. If the rate exceeds the defined limit, frames are dropped until the rate falls below the limit.

Administrators can configure up to four rate limit rules per port; however, each rule must not include conflicting 802.1p priority values. In order to control inbound and outbound traffic on the same port, two rate limiting rules must be configured (one for inbound and one for outbound). Since the rate limiting operation occurs after the processing of the multi-layer classification rules, the two features can be combined to provide application-aware rate limiting.

NOTE: This Rate Limiting function is not supported on SmartTrunk configured ports.

For more information about the application of the Rate Limiting function, refer to the Matrix E7 Series and SmartSwitch 6000 Series Local Management User’s Guide.

1.9FLOW CONTROL

Flow control is a method of managing the flow of frames between two devices. It ensures that a transmitting device does not overwhelm a receiving device with data. This is accomplished by the transmitting device pausing its transmission while the receiving device processes the frames already received.

Introduction 1-5