pcap-mst-dissected.txt

No.     Time           Source                Destination           Protocol Length Info
      2 0.253355       RealtekU_00:00:00     Spanning-tree-(for-bridges)_00 STP      167    MST. Root = 32768/0/52:54:00:00:00:00  Cost = 0  Port = 0x8001

Frame 2: 167 bytes on wire (1336 bits), 167 bytes captured (1336 bits)
    Encapsulation type: Ethernet (1)
    Arrival Time: Apr 17, 2022 15:19:24.396329000 Alaskan Daylight Time
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1650237564.396329000 seconds
    [Time delta from previous captured frame: 0.253355000 seconds]
    [Time delta from previous displayed frame: 0.253355000 seconds]
    [Time since reference or first frame: 0.253355000 seconds]
    Frame Number: 2
    Frame Length: 167 bytes (1336 bits)
    Capture Length: 167 bytes (1336 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:llc:stp]
    [Coloring Rule Name: Broadcast]
    [Coloring Rule String: eth[0] & 1]
IEEE 802.3 Ethernet 
    Destination: Spanning-tree-(for-bridges)_00 (01:80:c2:00:00:00)
        Address: Spanning-tree-(for-bridges)_00 (01:80:c2:00:00:00)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
    Source: RealtekU_00:00:00 (52:54:00:00:00:00)
        Address: RealtekU_00:00:00 (52:54:00:00:00:00)
        .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Length: 153
Logical-Link Control
    DSAP: Spanning Tree BPDU (0x42)
        0100 001. = SAP: Spanning Tree BPDU
        .... ...0 = IG Bit: Individual
    SSAP: Spanning Tree BPDU (0x42)
        0100 001. = SAP: Spanning Tree BPDU
        .... ...0 = CR Bit: Command
    Control field: U, func=UI (0x03)
        000. 00.. = Command: Unnumbered Information (0x00)
        .... ..11 = Frame type: Unnumbered frame (0x3)
Spanning Tree Protocol
    Protocol Identifier: Spanning Tree Protocol (0x0000)
    Protocol Version Identifier: Multiple Spanning Tree (3)
    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: 32768 / 0 / 52:54:00:00:00:00
        Root Bridge Priority: 32768
        Root Bridge System ID Extension: 0
        Root Bridge System ID: RealtekU_00:00:00 (52:54:00:00:00:00)
    Root Path Cost: 0
    Bridge Identifier: 32768 / 0 / 52:54:00:00:00:00
        Bridge Priority: 32768
        Bridge System ID Extension: 0
        Bridge System ID: RealtekU_00:00:00 (52:54:00:00:00:00)
    Port identifier: 0x8001
    Message Age: 0
    Max Age: 20
    Hello Time: 2
    Forward Delay: 15
    Version 1 Length: 0
    Version 3 Length: 112
    MST Extension
        MST Config ID format selector: 0
        MST Config name: 
        MST Config revision: 0
        MST Config digest: 4ead0c6e899e3db15ae9ec6c4c995efa
        CIST Internal Root Path Cost: 0
        CIST Bridge Identifier: 32768 / 0 / 52:54:00:00:00:00
            CIST Bridge Priority: 32768
            CIST Bridge Identifier System ID Extension: 0
            CIST Bridge Identifier System ID: RealtekU_00:00:00 (52:54:00:00:00:00)
        CIST Remaining hops: 20
        MSTID 2, Regional Root Identifier 32768 / 52:54:00:00:00:00
            MSTI 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
            1000 .... = Priority: 0x8
            .... 0000 0000 0010 = MSTID: 2
            Regional Root: RealtekU_00:00:00 (52:54:00:00:00:00)
            Internal root path cost: 0
            Bridge Identifier Priority: 8
            Port identifier priority: 8
            Remaining hops: 20
        MSTID 3, Regional Root Identifier 32768 / 52:54:00:00:00:00
            MSTI 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
            1000 .... = Priority: 0x8
            .... 0000 0000 0011 = MSTID: 3
            Regional Root: RealtekU_00:00:00 (52:54:00:00:00:00)
            Internal root path cost: 0
            Bridge Identifier Priority: 8
            Port identifier priority: 8
            Remaining hops: 20
        MSTID 4, Regional Root Identifier 32768 / 52:54:00:00:00:00
            MSTI 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
            1000 .... = Priority: 0x8
            .... 0000 0000 0100 = MSTID: 4
            Regional Root: RealtekU_00:00:00 (52:54:00:00:00:00)
            Internal root path cost: 0
            Bridge Identifier Priority: 8
            Port identifier priority: 8
            Remaining hops: 20