EE 281 Lecture Notes - Lecture 8: Checksum, Ieee 802.11, Crossbar Switch
Document Summary
In the forwarding table (using a longest prefix match) to determine the required output port to which the packet needs to be delivered. The output port of a router accepts outbound datagrams and encapsulates them with the appropriate link-layer headers (e. g. , Like the input port, it implements the link-layer protocol to transmit these outgoing packets (frames) on the physical interface of the line card. A packet is delivered from the input port to the output port via the router"s switch fabric. This is a general term for the architecture that allows the movement of packets between the line cards. This packet delivery may need to be delayed if the switch fabric cannot currently accept the packet or if another input port is currently moving data to that same output port. In that case, the packet will need to wait in a queue at the input port. A router will have queues at both input and output ports.
