Patent ID: 8243729

Claim:
A method of forwarding a packet in a logical stacked chassis, comprising: configuring forwarding tables stored on a first physical chassis and a second physical chassis comprising the logical stacked chassis to forward a packet from an ingress port on the first physical chassis over a stacked link aggregation group to an egress port on the second physical chassis, the packet not including a stacking LAG header; receiving the packet at an ingress port of the first physical chassis and using destination information in the packet and the forwarding table stored in the first physical chassis to perform a first lookup operation, and using the results of the first lookup operation to send the packet over the stacking LAG to the second physical chassis; the second physical chassis receiving the packet and using the destination information in the packet and the forwarding table stored in the second physical chassis to perform a second lookup operation, and using the results of the second lookup operation to send the packet to the correct egress port on the second physical chassis.