BPDU
- abbr.桥梁协议数据单位(Bridge Protocol Data Unit)
BPDU-
BPDU and network management messages are processed .
BPDU和网络管理消息仍将被处理。
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However , according to the standard of 802.1D , it is impossible to forward BPDU segment with VLAN TAG .
然而，按照802.1D标准BPDU不带VLANtag，而且要求所有网桥不能转发BPDU；
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In the same condition , testing shows that this self-adaptive-interval sending BPDU data-package algorithm spends network bandwidth more reasonably and reduces the convergent-time more effectively .
测试表明在其他条件相同的情况下，该自适应时间间隔发送BP-DU数据包算法比定时发送BPDU数据包更合理地利用了网络带宽，更有效地减小了收敛时间。
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A tree is created and maintained by the switch for every VLAN according to the mark affiliated in BPDU . It can cut down the delay from the block state to transmitting state obviously and improve the real-time characteristic in the Ethernet .
在BPDU中加入标示性能的标志，交换机根据这个标志为每个VLAN生成、维护一个稳定的树结构，使交换机端口由阻止状态到转发状态的延迟明显缩短，提高了网络的实时特性。