「Multicast」- PIM-Sparse Mode，常见报文格式

Frame 866: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface -, id 0
Ethernet II, Src: HuaweiTe_3e:77:c4 (00:e0:fc:3e:77:c4), Dst: IPv4mcast_0d (01:00:5e:00:00:0d)
Internet Protocol Version 4, Src: 10.0.45.5, Dst: 224.0.0.13
Protocol Independent Multicast
    0010 .... = Version: 2
    .... 0100 = Type: Bootstrap (4)
    Reserved byte(s): 00
    Checksum: 0x43cd [correct]
    [Checksum Status: Good]
    PIM Options
        Fragment tag: 0x6f10
        Hash mask len: 30
        BSR priority: 30
        BSR: 10.0.0.4
            Address Family: IPv4 (1)
            Encoding Type: Native (0)
            Unicast: 10.0.0.4

Frame 1585: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface -, id 0
Ethernet II, Src: HuaweiTe_ce:7c:6d (00:e0:fc:ce:7c:6d), Dst: HuaweiTe_54:69:ea (00:e0:fc:54:69:ea)
Internet Protocol Version 4, Src: 10.0.0.2, Dst: 10.0.0.4
Protocol Independent Multicast
    0010 .... = Version: 2
    .... 1000 = Type: Candidate-RP-Advertisement (8)
    Reserved byte(s): 00
    Checksum: 0xea62 [correct]
    [Checksum Status: Good]
    PIM Options
        Prefix-count: 1
        Priority: 0
        Holdtime: 150
        RP: 10.0.0.2
            Address Family: IPv4 (1)
            Encoding Type: Native (0)
            Unicast: 10.0.0.2
        Group 0: 224.0.0.0/4
            Address Family: IPv4 (1)
            Encoding Type: Native (0)
            Flags: 0x00
            Masklen: 4
            Group: 224.0.0.0