PIM报文通用格式
PIM通过路由器之间交互PIM控制消息实现组播路由功能。所有的PIM控制消息头部有相同的格式.
一、PIM报文消息头部格式
0 4 8 16 31
+-----------+--------+------------+------------+
| Version | Type | Reserved | Checksum |
+-----------+--------+------------+------------+
二、PIM报文消息头部格式解释
| 字段 | 长度 | 说明 |
|---|---|---|
| Version | 4比特 | PIM版本，值为2。 |
| Type | 4比特 | 消息类型，取值如下：
|
| 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。 |
三、PIM报文示例
Frame 1: 68 bytes on wire (544 bits), 68 bytes captured (544 bits)
Encapsulation type: Ethernet (1)
Arrival Time: Nov 11, 2009 17:59:15.953249850
[Time shift for this packet: 0.000000000 seconds]
Epoch Time: 1257933555.953249850 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: 68 bytes (544 bits)
Capture Length: 68 bytes (544 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ethertype:vlan:ethertype:ip:pim]
Ethernet II, Src: 00:e0:fc:00:29:cf (00:e0:fc:00:29:cf), Dst: 00:e0:fc:00:29:d6 (00:e0:fc:00:29:d6)
Destination: 00:e0:fc:00:29:d6 (00:e0:fc:00:29:d6)
Address: 00:e0:fc:00:29:d6 (00:e0:fc:00:29:d6)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
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: 7, CFI: 0, ID: 8
111. .... .... .... = Priority: Network Control (7)
...0 .... .... .... = CFI: Canonical (0)
.... 0000 0000 1000 = ID: 8
Type: IP (0x0800)
Padding: 00000000
Trailer: 00000000f0a5d204
Internet Protocol Version 4, Src: 10.2.3.4 (10.2.3.4), Dst: 10.2.2.3 (10.2.2.3)
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: 38
Identification: 0x1108 (4360)
Flags: 0x00
0... .... = Reserved bit: Not set
.0.. .... = Don't fragment: Not set
..0. .... = More fragments: Not set
Fragment offset: 0
Time to live: 255
Protocol: PIM (103)
Header checksum: 0xa19e [validation disabled]
[Good: False]
[Bad: False]
Source: 10.2.3.4 (10.2.3.4)
Destination: 10.2.2.3 (10.2.2.3)
[Source GeoIP: Unknown]
[Destination GeoIP: Unknown]
Protocol Independent Multicast
0010 .... = Version: 2
.... 0010 = Type: Register-stop (2)
Reserved byte(s): 00
Checksum: 0xf2d8 [correct]
PIM options
Group: 228.1.1.1 (228.1.1.1)/32
Source: 20.2.2.2 (20.2.2.2)
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