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CCNP Enterprise Core (350-401) Cisco Packet Forwarding

Distributed Forwarding

Distributed forwarding is when there are line cards that can make decisions without the input of a route processor.

When a packet is received on the ingress line card, it is transmitted to the local forwarding engine. The forwarding engine performs a packet lookup and determines if the outbound interface is local.

If the outbound interface is local it will forward the packet out of a local interface.

If the outbound interface is not local and located on a different line card, the packet is sent across the switch fabric, which is also known as the back plane, directly to the egress line card and bypassing the route processor.

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