PIM Join/Prune报文格式

PIM Join/Prune报文格式
注册/剪枝（Join/Prune）消息可在PIM-DM和PIM-SM中使用。一条Join/Prune消息中可以同时包含Join信息和Prune信息。只包含Join信息的Join/Prune消息称为Join消息。只包含Prune信息的Join/Prune消息称为Prune消息。
一、Join/Prune消息报文格式

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-------+-------+---------------+-------------------------------+
   |PIM Ver| Type  |   Reserved    |           Checksum            |
   +-------+-------+---------------+-------------------------------+
   |        Upstream Neighbor Address (Encoded-Unicast format)     |
   +-------------------------------+-------------------------------+
   |  Reserved     | Num groups    |          Holdtime             |
   +-------------------------------+-------------------------------+
   |         Multicast Group Address 1 (Encoded-Group format)      |
   +-------------------------------+-------------------------------+
   |   Number of Joined Sources    |   Number of Pruned Sources    |
   +-------------------------------+-------------------------------+
   |        Joined Source Address 1 (Encoded-Source format)        |
   +---------------------------------------------------------------+
   |                             .                                 |
   |                             .                                 |
   +---------------------------------------------------------------+
   |        Joined Source Address n (Encoded-Source format)        |
   +---------------------------------------------------------------+
   |        Pruned Source Address 1 (Encoded-Source format)        |
   +---------------------------------------------------------------+
   |                             .                                 |
   |                             .                                 |
   +---------------------------------------------------------------+
   |        Pruned Source Address n (Encoded-Source format)        |
   +---------------------------------------------------------------+
   |                           .                                   |
   |                           .                                   |
   +---------------------------------------------------------------+
   |         Multicast Group Address m (Encoded-Group format)      |
   +-------------------------------+-------------------------------+
   |   Number of Joined Sources    |   Number of Pruned Sources    |
   +-------------------------------+-------------------------------+
   |        Joined Source Address 1 (Encoded-Source format)        |
   +---------------------------------------------------------------+
   |                             .                                 |
   |                             .                                 |
   +---------------------------------------------------------------+
   |        Joined Source Address n (Encoded-Source format)        |
   +---------------------------------------------------------------+
   |        Pruned Source Address 1 (Encoded-Source format)        |
   +---------------------------------------------------------------+
   |                             .                                 |
   |                             .                                 |
   +---------------------------------------------------------------+
   |        Pruned Source Address n (Encoded-Source format)        |
   +---------------------------------------------------------------+

二、Join/Prune消息报文格式解释

字段	长度	说明
PIM Ver	4比特	PIM版本，值为2。
Type	4比特	消息类型，值为3。
Reserved	8比特	保留。发送者将其设置为0，接收者忽略此字段。
Checksum	16比特	校验和。
Upstream Neighbor Address	32比特	上游邻居地址。也就是收到Join/Prune消息的路由器上，进行Join或Prune操作的下游接口地址。
Num groups	8比特	消息中包含的组播组数目。
Holdtime	16比特	接收Join/Prune消息的路由器保持相应接口加入/剪枝状态的时间。
Multicast Group Address	32比特	组播组地址。
Number of Joined Sources	16比特	针对该组播组，请求加入的组播源总数。
Number of Pruned Sources	16比特	针对该组播组，请求剪枝的组播源总数。
Joined Source Address	32比特	请求加入的组播源地址。
Pruned Source Address	32比特	请求剪枝的组播源地址。

三、PIM Join消息报文示例

Frame 1: 76 bytes on wire (608 bits), 76 bytes captured (608 bits)
    Encapsulation type: Ethernet (1)
    Arrival Time: Feb 23, 2010 21:41:59.308212530
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1266932519.308212530 seconds
    [Time delta from previous captured frame: 0.000000000 seconds]
    [Time delta from previous displayed frame: 0.000000000 seconds]
    [Time since reference or first frame: 0.000000000 seconds]
    Frame Number: 1
    Frame Length: 76 bytes (608 bits)
    Capture Length: 76 bytes (608 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:vlan:ethertype:ip:pim]
    [Coloring Rule Name: Broadcast]
    [Coloring Rule String: eth[0] & 1]
Ethernet II, Src: 00:e0:fc:00:29:cf (00:e0:fc:00:29:cf), Dst: IPv4mcast_0d (01:00:5e:00:00:0d)
    Destination: IPv4mcast_0d (01:00:5e:00:00:0d)
        Address: IPv4mcast_0d (01:00:5e:00:00:0d)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
    Source: 00:e0:fc:00:29:cf (00:e0:fc:00:29:cf)
        Address: 00:e0:fc:00:29:cf (00:e0:fc:00:29:cf)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: 802.1Q Virtual LAN (0x8100)
802.1Q Virtual LAN, PRI: 6, CFI: 0, ID: 17
    110. .... .... .... = Priority: Voice, < 10ms latency and jitter (6)
    ...0 .... .... .... = CFI: Canonical (0)
    .... 0000 0001 0001 = ID: 17
    Type: IP (0x0800)
    Trailer: 0643e6be
Internet Protocol Version 4, Src: 10.7.22.7 (10.7.22.7), Dst: 224.0.0.13 (224.0.0.13)
    Version: 4
    Header Length: 20 bytes
    Differentiated Services Field: 0xc0 (DSCP 0x30: Class Selector 6; ECN: 0x00: Not-ECT (Not ECN-Capable Transport))
        1100 00.. = Differentiated Services Codepoint: Class Selector 6 (0x30)
        .... ..00 = Explicit Congestion Notification: Not-ECT (Not ECN-Capable Transport) (0x00)
    Total Length: 54
    Identification: 0x0082 (130)
    Flags: 0x00
        0... .... = Reserved bit: Not set
        .0.. .... = Don't fragment: Not set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 1
    Protocol: PIM (103)
    Header checksum: 0xc104 [validation disabled]
        [Good: False]
        [Bad: False]
    Source: 10.7.22.7 (10.7.22.7)
    Destination: 224.0.0.13 (224.0.0.13)
    [Source GeoIP: Unknown]
    [Destination GeoIP: Unknown]
Protocol Independent Multicast
    0010 .... = Version: 2
    .... 0011 = Type: Join/Prune (3)
    Reserved byte(s): 00
    Checksum: 0xa99f [correct]
    PIM options
        Upstream-neighbor: 10.7.22.22 (10.7.22.22)
        Reserved byte(s): 00
        Num Groups: 1
        Holdtime: 210s 
        Group 0: 228.1.1.1/32
            Num Joins: 1
                IP address: 10.22.22.22/32 (SWR)
            Num Prunes: 0

四、PIM Prune消息报文示例

Frame 1: 76 bytes on wire (608 bits), 76 bytes captured (608 bits)
    Encapsulation type: Ethernet (1)
    Arrival Time: Feb 23, 2010 21:41:49.079659960
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1266932509.079659960 seconds
    [Time delta from previous captured frame: 0.000000000 seconds]
    [Time delta from previous displayed frame: 0.000000000 seconds]
    [Time since reference or first frame: 0.000000000 seconds]
    Frame Number: 1
    Frame Length: 76 bytes (608 bits)
    Capture Length: 76 bytes (608 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:vlan:ethertype:ip:pim]
    [Coloring Rule Name: Broadcast]
    [Coloring Rule String: eth[0] & 1]
Ethernet II, Src: 00:e0:fc:00:29:cf (00:e0:fc:00:29:cf), Dst: IPv4mcast_0d (01:00:5e:00:00:0d)
    Destination: IPv4mcast_0d (01:00:5e:00:00:0d)
        Address: IPv4mcast_0d (01:00:5e:00:00:0d)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
    Source: 00:e0:fc:00:29:cf (00:e0:fc:00:29:cf)
        Address: 00:e0:fc:00:29:cf (00:e0:fc:00:29:cf)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: 802.1Q Virtual LAN (0x8100)
802.1Q Virtual LAN, PRI: 6, CFI: 0, ID: 17
    110. .... .... .... = Priority: Voice, < 10ms latency and jitter (6)
    ...0 .... .... .... = CFI: Canonical (0)
    .... 0000 0001 0001 = ID: 17
    Type: IP (0x0800)
    Trailer: ac69d623
Internet Protocol Version 4, Src: 10.7.22.7 (10.7.22.7), Dst: 224.0.0.13 (224.0.0.13)
    Version: 4
    Header Length: 20 bytes
    Differentiated Services Field: 0xc0 (DSCP 0x30: Class Selector 6; ECN: 0x00: Not-ECT (Not ECN-Capable Transport))
        1100 00.. = Differentiated Services Codepoint: Class Selector 6 (0x30)
        .... ..00 = Explicit Congestion Notification: Not-ECT (Not ECN-Capable Transport) (0x00)
    Total Length: 54
    Identification: 0x007c (124)
    Flags: 0x00
        0... .... = Reserved bit: Not set
        .0.. .... = Don't fragment: Not set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 1
    Protocol: PIM (103)
    Header checksum: 0xc10a [validation disabled]
        [Good: False]
        [Bad: False]
    Source: 10.7.22.7 (10.7.22.7)
    Destination: 224.0.0.13 (224.0.0.13)
    [Source GeoIP: Unknown]
    [Destination GeoIP: Unknown]
Protocol Independent Multicast
    0010 .... = Version: 2
    .... 0011 = Type: Join/Prune (3)
    Reserved byte(s): 00
    Checksum: 0xa99f [correct]
    PIM options
        Upstream-neighbor: 10.7.22.22 (10.7.22.22)
        Reserved byte(s): 00
        Num Groups: 1
        Holdtime: 210s 
        Group 0: 228.1.1.1/32
            Num Joins: 0
            Num Prunes: 1
                IP address: 10.22.22.22/32 (SWR)

PIM Join/Prune报文格式

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