Abstract: A method is provided for pseudo wire processing in a packet forwarding device in which a packet is processed based on whether the ports through which the packet is transmitted are real or pseudo wire ports. The inbound and outbound port information is encoded using a predefined range of index values such that index values falling within one range of values are used for passing real port information, and index values falling within another range of values are used for passing pseudo wire port information. The index values are used in a manner that facilitates efficient performance of pseudowire processing for the packets in the switch fabric component of the packet forwarding device.

Abstract: Methods, systems, and computer program products for controlling enqueuing of packets in an aggregated queue including a plurality of virtual queues are disclosed. According to one method, packets are received at the input side of a queuing system. Each packet is classified into a virtual queue corresponding to one of a plurality of output queues. The output queue sends backpressure messages to the enqueue controller. The enqueue controller determines whether to place the packets in the aggregated queue based on the backpressure messages.

Abstract: Methods, systems, and computer program products for killing prioritized packets in multiple queues using time-to-live values to prevent head-of-line blocking. In one example, a method for scheduling prioritized packets in queuing system includes receiving a plurality of packets having a plurality of different priorities. The method can also include assigning the packets to the queues, wherein at least some of the queues include packets of a plurality of different priorities. In addition, the method can include assigning a first time-to-live (TTL) value to a first packet in a first queue. The method can also include altering the first TTL value of the first packet in response to a second packet of a second queue being scheduled. Further, the method can include discarding the first packet in response to the first TTL value having a predetermined relationship with respect to a predetermined value.

Abstract: A method is provided for pseudo wire processing in a packet forwarding device in which a packet is processed based on whether the ports through which the packet is transmitted are real or pseudo wire ports. The inbound and outbound port information is encoded using a predefined range of index values such that index values falling within one range of values are used for passing real port information, and index values falling within another range of values are used for passing pseudo wire port information. The index values are used in a manner that facilitates efficient performance of pseudowire processing for the packets in the switch fabric component of the packet forwarding device.

Abstract: Methods, systems, and computer program products for allocating excess bandwidth of an output among network users are disclosed. According to one method, packets associated with a plurality of network users for forwarding to an output are received. The packets can include a first non-committed information rate (CIR) packet associated with a first network user. The method can include a step for maintaining a count of non-CIR packets sent for the first network user. Further, the method can include preventing the first non-CIR packet from being forwarded to the output in response to the count having a predetermined relationship with respect to a threshold level.