University:
Boston University
Course:
CAS CS 543 | Algorithmic Techniques for Taming Big Data
Academic year:

2023
Views:

263

Pages:

14
Author:

kundgetanufv

Frame Forwarding Frame Forwarding Frame Forwarding Frame Forwarding Frame Forwarding Switch Forwarding Methods • Switches use software on application-specific-integrated circuits (ASICs) to make very quick decisions. Frame Forwarding Switch Forwarding Methods A switch will use one of two methods to make forwarding decisions after it receives a frame: • Store-and-forward switching • Cut-through switching Frame Forwarding Switch Forwarding Methods Store-and-forward switching • Receives the entire frame and ensures the frame is valid. • Store-and-forward switching is Cisco’s preferred switching method. Frame Forwarding Switch Forwarding Methods Cut-through switching • Forwards the frame immediately after determining the destination MAC address of an incoming frame and the egress port. Frame Forwarding Store-and-Forward Switching Two primary characteristics: 1. Error Checking • The switch will check the Frame Check Sequence (FCS) for CRC errors. • Bad frames will be discarded. Frame Forwarding Store-and-Forward Switching Two primary characteristics: 2. Buffering • The ingress interface will buffer the frame while it checks the FCS. Frame Forwarding Store-and-Forward Switching Two primary characteristics: 2. Buffering • This also allows the switch to adjust to a potential difference in speeds between the ingress and egress ports. Frame Forwarding Store-and-Forward Switching Frame Forwarding Cut-Through Switching • Cut-through forwards the frame immediately after determining the destination MAC. Frame Forwarding Cut-Through Switching • Fragment (Frag) Free method will check the destination and ensure that the frame is at least 64 Bytes. • This will eliminate runts.

Frame Forwarding Lecture Part 3

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