「Multicast」- PIM-Dense Mode 报文格式

PIM Hello

在 PIM Hello 中，携带多项 PIM 协议报文参数，主要用于 PIM Neighbor 间的 PIM 协议报文的控制。

具体如下：
1）DR_Priority：表示各路由器接口竞选DR的优先级，优先级越高越容易获胜。
2）Holdtime：表示保持邻居为可达状态的超时时间。如果在超时时间内没有收到PIM邻居发送的Hello报文，路由器则认为邻居不可达。
3）LAN_Delay：表示共享网段内传输 Prune 报文的延迟时间。
4）Neighbor-Tracking：表示邻居跟踪功能。
5）Override-Interval：表示 Hello 报文中携带的否决剪枝的时间间隔。 

Frame 2: 76 bytes on wire (608 bits), 76 bytes captured (608 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
    .... 0000 = Type: Hello (0)
    Reserved byte(s): 00
    Checksum: 0x2720 [correct]
    [Checksum Status: Good]
    PIM Options: 5
        Option 1: Hold Time: 105
        Option 19: DR Priority: 1
        Option 20: Generation ID: 3401703534
        Option 2: LAN Prune Delay: T = 0, Propagation Delay = 500ms, Override Interval = 2500ms
        Option 21: State-Refresh: Version = 1, Interval = 60s

PIM Assert

Frame 34: 60 bytes on wire (480 bits), 60 bytes captured (480 bits) on interface -, id 0
Ethernet II, Src: HuaweiTe_1b:76:bc (00:e0:fc:1b:76:bc), Dst: IPv4mcast_0d (01:00:5e:00:00:0d)
Internet Protocol Version 4, Src: 10.0.45.3, Dst: 224.0.0.13
Protocol Independent Multicast
    0010 .... = Version: 2
    .... 0101 = Type: Assert (5)
    Reserved byte(s): 00
    Checksum: 0x2633 [correct]
    [Checksum Status: Good]
    PIM Options
        Group: 239.1.1.1/32
            Address Family: IPv4 (1)
            Encoding Type: Native (0)
            Flags: 0x00
                0... .... = Bidirectional PIM: Not set
                .000 000. = Reserved: 0x00
                .... ...0 = Admin Scope Zone: Not set
            Masklen: 32
            Group: 239.1.1.1
        Source: 192.168.2.1
            Address Family: IPv4 (1)
            Encoding Type: Native (0)
            Unicast: 192.168.2.1
        0... .... = RP Tree: False
        .000 0000 0000 0000 0000 0000 0000 0000 = Metric Preference: 0
        Metric: 0

PIM Join / PIM Prune

Frame 48: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) on interface -, id 0
Ethernet II, Src: HuaweiTe_54:69:ea (00:e0:fc:54:69:ea), Dst: IPv4mcast_0d (01:00:5e:00:00:0d)
Internet Protocol Version 4, Src: 10.0.45.4, Dst: 224.0.0.13
Protocol Independent Multicast
    0010 .... = Version: 2
    .... 0011 = Type: Join/Prune (3)
    Reserved byte(s): 00
    Checksum: 0xef3b [correct]
    [Checksum Status: Good]
    PIM Options
        Upstream-neighbor: 10.0.45.3
            Address Family: IPv4 (1)
            Encoding Type: Native (0)
            Unicast: 10.0.45.3
        Reserved byte(s): 00
        Num Groups: 1
        Holdtime: 210
        Group 0
            Group 0: 239.1.1.1/32
                Address Family: IPv4 (1)
                Encoding Type: Native (0)
                Flags: 0x00
                    0... .... = Bidirectional PIM: Not set
                    .000 000. = Reserved: 0x00
                    .... ...0 = Admin Scope Zone: Not set
                Masklen: 32
                Group: 239.1.1.1
            Num Joins: 0
            Num Prunes: 1
                IP address: 192.168.2.1/32
                    Address Family: IPv4 (1)
                    Encoding Type: Native (0)
                    Flags: 0x00
                        0000 0... = Reserved: 0x00
                        .... .0.. = Sparse: Not set
                        .... ..0. = WildCard: Not set
                        .... ...0 = Rendezvous Point Tree: Not set
                    Masklen: 32
                    Source: 192.168.2.1

PIM State-Refresh

Frame 34: 70 bytes on wire (560 bits), 70 bytes captured (560 bits) on interface -, id 0
Ethernet II, Src: HuaweiTe_54:69:e9 (00:e0:fc:54:69:e9), Dst: IPv4mcast_0d (01:00:5e:00:00:0d)
Internet Protocol Version 4, Src: 10.0.46.4, Dst: 224.0.0.13
Protocol Independent Multicast
    0010 .... = Version: 2
    .... 1001 = Type: State-Refresh (9)
    Reserved byte(s): 00
    Checksum: 0x30e9 [correct]
    [Checksum Status: Good]
    PIM Options
        Group: 239.1.1.1/32
            Address Family: IPv4 (1)
            Encoding Type: Native (0)
            Flags: 0x00
            Masklen: 32
            Group: 239.1.1.1
        Source: 192.168.2.1
            Address Family: IPv4 (1)
            Encoding Type: Native (0)
            Unicast: 192.168.2.1
        Originator: 10.0.45.3
            Address Family: IPv4 (1)
            Encoding Type: Native (0)
            Unicast: 10.0.45.3
        0... .... = RP Tree: False
        .000 0000 0000 0000 0000 0000 0000 1010 = Metric Preference: 10
        Metric: 2
        Masklen: 24
        TTL: 254
        1... .... = Prune indicator: Set
        .0.. .... = Prune now: Not set
        ..1. .... = Assert override: Set
        Interval: 60

PIM Graft

Frame 77: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) on interface -, id 0
Ethernet II, Src: HuaweiTe_4e:66:64 (00:e0:fc:4e:66:64), Dst: HuaweiTe_54:69:e9 (00:e0:fc:54:69:e9)
Internet Protocol Version 4, Src: 10.0.46.6, Dst: 10.0.46.4
Protocol Independent Multicast
    0010 .... = Version: 2
    .... 0110 = Type: Graft (6)
    Reserved byte(s): 00
    Checksum: 0xec0c [correct]
    [Checksum Status: Good]
    PIM Options
        Upstream-neighbor: 10.0.46.4
            Address Family: IPv4 (1)
            Encoding Type: Native (0)
            Unicast: 10.0.46.4
        Reserved byte(s): 00
        Num Groups: 1
        Holdtime: 0
        Group 0
            Group 0: 239.1.1.1/32
                Address Family: IPv4 (1)
                Encoding Type: Native (0)
                Flags: 0x00
                Masklen: 32
                Group: 239.1.1.1
            Num Joins: 1
                IP address: 192.168.2.1/32
                    Address Family: IPv4 (1)
                    Encoding Type: Native (0)
                    Flags: 0x00
                    Masklen: 32
                    Source: 192.168.2.1
            Num Prunes: 0

PIM Graft-Ack

Frame 78: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) on interface -, id 0
Ethernet II, Src: HuaweiTe_54:69:e9 (00:e0:fc:54:69:e9), Dst: HuaweiTe_4e:66:64 (00:e0:fc:4e:66:64)
Internet Protocol Version 4, Src: 10.0.46.4, Dst: 10.0.46.6
Protocol Independent Multicast
    0010 .... = Version: 2
    .... 0111 = Type: Graft-Ack (7)
    Reserved byte(s): 00
    Checksum: 0xeb0a [correct]
    [Checksum Status: Good]
    PIM Options
        Upstream-neighbor: 10.0.46.6
            Address Family: IPv4 (1)
            Encoding Type: Native (0)
            Unicast: 10.0.46.6
        Reserved byte(s): 00
        Num Groups: 1
        Holdtime: 0
        Group 0
            Group 0: 239.1.1.1/32
                Address Family: IPv4 (1)
                Encoding Type: Native (0)
                Flags: 0x00
                Masklen: 32
                Group: 239.1.1.1
            Num Joins: 1
                IP address: 192.168.2.1/32
                    Address Family: IPv4 (1)
                    Encoding Type: Native (0)
                    Flags: 0x00
                    Masklen: 32
                    Source: 192.168.2.1
            Num Prunes: 0

Filed under: K4NZDROID - @ 3:44 PM