| US 7,522,525 B2 | ||
| L2 switch | ||
| Hironori Mieno, Kawasaki (Japan); Youichi Konuma, Kawasaki (Japan); Jyunichi Shimada, Kawasaki (Japan); Koichi Saiki, Kawasaki (Japan); Takashi Okuda, Kawasaki (Japan); and Takanori Sasaki, Yokohama (Japan) | ||
| Assigned to Fujitsu Limited, Kawasaki (Japan) | ||
| Filed on Mar. 10, 2005, as Appl. No. 11/77,303. | ||
| Application 11/077303 is a continuation of application No. PCT/JP02/11313, filed on Oct. 30, 2002. | ||
| Prior Publication US 2005/0163132 A1, Jul. 28, 2005 | ||
| Int. Cl. G01R 31/08 (2006.01); H04L 12/28 (2006.01) | ||
| U.S. Cl. 370—235 [370/412] | 24 Claims |
| 1. An ingress L2 switch comprising:
a VLAN functional portion mapping a frame to a predetermined VLAN;
a frame classifying portion assigning to the frame a first tag indicating a priority preset with respect to the frame;
a policing portion comparing a detected transmission rate of the frame with a preset transmission rate, and assigning to the
frame a second tag indicating whether or not the frame can be discarded, wherein the VLAN functional portion assigns to the
frame a VLAN tag identifying the mapped VLAN;
a switch fabric switching the frame based on the VLAN tag; and
a shaper outputting the frame based on the priority indicated by the first tag and discarding the frame having congested based
on the second tag, wherein the shaper includes:
a plurality of queues, each of which corresponds to the priority and queues the frame based on the priority indicated by the
first tag for each VLAN;
a first scheduler taking out the queued frame based on the priority of the queue for each VLAN; and
a second scheduler taking out the frame taken out by the first scheduler by a weighted round-robin method.
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