「RSTP」- 2.Network Packet Format

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RST BPDU

BPDU Type，
1）0x02，RST/MST Config BPDU（注意与 STP Config BPUD 对比，STP_Config_BPDU.BPDU_Type=0x00）

Flags，原始 STP 的 BPDU Flags 仅使用第一位（TC）和第八位（TCA），但是在 RSTP 中得到扩充。
1）Agreement、Proposal
2）Forwarding / Learning：
3）Port Role：

RST CFG BPDU

Frame 1859: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface -, id 0
IEEE 802.3 Ethernet 
Logical-Link Control
Spanning Tree Protocol
    Protocol Identifier: Spanning Tree Protocol (0x0000)
    Protocol Version Identifier: Rapid Spanning Tree (2)
    BPDU Type: Rapid/Multiple Spanning Tree (0x02)
    BPDU flags: 0x7c, Agreement, Forwarding, Learning, Port Role: Designated
        0... .... = Topology Change Acknowledgment: No
        .1.. .... = Agreement: Yes
        ..1. .... = Forwarding: Yes
        ...1 .... = Learning: Yes
        .... 11.. = Port Role: Designated (3)
        .... ..0. = Proposal: No
        .... ...0 = Topology Change: No
    Root Identifier: 4096 / 0 / 4c:1f:cc:55:44:dc
        Root Bridge Priority: 4096
        Root Bridge System ID Extension: 0
        Root Bridge System ID: HuaweiTe_55:44:dc (4c:1f:cc:55:44:dc)
    Root Path Cost: 0
    Bridge Identifier: 4096 / 0 / 4c:1f:cc:55:44:dc
        Bridge Priority: 4096
        Bridge System ID Extension: 0
        Bridge System ID: HuaweiTe_55:44:dc (4c:1f:cc:55:44:dc)
    Port identifier: 0x8001
    Message Age: 0
    Max Age: 20
    Hello Time: 2
    Forward Delay: 15
    Version 1 Length: 0