When a packet is received in a port, it starts its journey in the ingress pipeline. Scheduled Forwarding and Virtual Output Queues It requires fast communication between the ingress pipeline and its egress counterpart. But when packets are buffered in potentially dozens of ingress PFEs (Packet Forwarding Engines), we need a new mechanism to guarantee the forwarding efficiency. When the packets are stored in egress before transmission, it’s easy to classify them and apply different treatments with QoS policies. It reduces the footprint on the Printed Circuit Board (PCB)Įverything in technology is a trade-off, it creates other challenges.It reduces by half the memory requirement.Using an ingress-only deep buffer offers multiple advantages: The egress on-chip buffer is 12 MB (6 per core).The ingress off-chip buffer is 8 GB (shared).
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