帧进出交换机全过程

最新推荐文章于 2024-05-27 11:49:08 发布

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最新推荐文章于 2024-05-27 11:49:08 发布

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原文链接：https://yq.aliyun.com/articles/529288

本文详细介绍了交换机处理帧的过程，包括帧接收、错误丢弃、VLAN分类及过滤等关键步骤，并阐述了如何根据服务数据单元大小、VLAN规则进行帧转发或丢弃的策略。

a) Frame reception.
b) Discard on received frame in error (6.3.2).
c) Frame discard if the frame_type is not user_data_frame, or if its mac_action parameter is not
request_with_no_response (8.5, 6.4).
d) Regeneration of user priority, if required (6.4).
e) Application of VLAN ingress rules to classify each received frame to a particular VLAN (8.6.1).
f) Frame discard if the frame is not classified or the receiving port does not accept frame from that
VLAN.
g) Frame discard following the application of filtering information.

h) Frame discard on transmittable service data unit size exceeded (6.3.8).
i) Forwarding of received frames to other Bridge Ports.
j) Frame discard following the application of VLAN egress rules if the service data unit cannot be
mapped correctly or the receiving port does not transmit frames to the particular VLAN to which the
frame belongs.
k) Selection of traffic class, following the application of filtering information.
l) Queuing of frames by traffic class.
m) Frame discard to ensure that a maximum bridge transit delay is not exceeded (6.3.6).
n) Selection of queued frames for transmission.
o) Selection of outbound access priority (6.3.9).
p) Mapping of service data units and recalculation of Frame Check Sequence, if required (8.6.9, 6.3.7).
q) Frame transmission.

本文转自游来游去岛博客51CTO博客，原文链接http://blog.51cto.com/ylyqd/2070如需转载请自行联系原作者

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