TCP/IP

IGMP

UC103

1

IGMP

IGMP OSI

2

(IP)(unicast)(multicast)

1.unicast

2.broadcast

200

200

IP (IGMP)

packet

3

IP

IP

cpu

(Multicast) IP IP

IP

IP

IP

(IGMPInternet Group Management Protocol)

IGMP IGMP 1 (IGMP v1) IGMP 2 (IGMP

v2) IGMP 3 (IGMP v3) IP

4

IP

(1) RFC1112

RFC1112 (levels) IP

a. 0 (level 0): (host)

b. 1 (level 1):

c. 2 (level 2):

(2) (join) (leave)

(Internet Group Management Protocol, IGMP)

5

(3)(Multicast Router)

(Distance Vector Multicast Routing Protocol,

DVMRP)

(4) (routing path) (shortest path)

(Multicast Open Shortest Path First protocol, MOSPF)

Multicast (Internet Protocol)

D (class D) 1 (Group) multicast

group ID 244.0.0.0239.255.255.255 224.0.0.0

224.0.0.255 (local network)

224.0.0.1 (system)

224.0.0.2 " (routers) "

(Ethernet) IP

IP

2 :

6

region A IP 23 (bits) (copy)

23 ; region B IP

(bits) 24 01:00:5e (

16 ) 25 0

(data-link layer)

;

(IP layer) 32 multicast group IDs

(IP layer) (filtering)

7

IGMP(Internet Group Management Protocol)

IGMP

IGMP

IGMP

IGMP

Querier

IGMPv1(RFC1112)IGMPv2 (RFC2236) IGMPv3 (RFC3376)

IGMP multicast

A.IMGPv1

IGMPv1 IGMP RFC1112 [15] IGMPv1 IGMP IGMP 0001 Type IGMPv1 Type=1 (HostMembership Query)(224.0.0.1) Type=2 (Host Membership Report) 8 (Unused) 0 16 (Checksum) 32 IP

8

IGMP v1 IP

IGMPv1

IGMPv1

Version IGMP

Type 0001=(Query)

0002=(Report)

Unused 0

Checksum

9

(Report) IGMP IP 224.0.0.2 IGMPv1 (Query) IGMPv1 2 IGMP 0IP 224.0.0.1 (Query) 010 ( 0.1 )

B.IMGPv2

IGMPv2 [18] IGMPv1

IGMPv2

Group-Specific Query) (Leave Group Message)

(224.0.0.1) IGMPv2

Type 8

IGMPv1 Ver Type

IGMPv2 0x11IGMPv1 Ver

0001Type=00010x11

10

IGMPv2 1 Type=0x12IGMPv1

Type=0002Ver 0x12Type

8 10

0IGMPv1 IGMPv2

IGMPv1

IGMPv2

IGMPv2

IGMPv2 IGMPv1

(Message)

Ttpe (0x11)=(Query)

(0x12)=1(Report)

(0x16)=1(Report)

(0x17)= (Message)

Max Response Time 10

Checksum

Group Address IP

11

0

Max

Response Time () 1

0.1

C.IMGPv3

IGMP [7] Group-and-Source-Specific Query

IGMPv3 Type

IGMPv2 Type 0x22 IGMPv3

IGMPv2

4 01 S Flag

(Suppress Router-Side Processing)4 QRV(Queriers Robustness Variable)

8 QQIC (Queriers QueryInterval Code)16

IGMPv3 IGMPv3

IGMPv3

12

IGMP OSI

13

:

Info IGMPv3

224.0.0.252

14

Ethernet Src MAC 002354f2d5a4

Ethernet Dst MAC 01005e000016

Internet Protocol Src IP 192.168.168.66

Internet Protocol Dst IP 224.0.0.22

ICMP IGMPv3

Type (0x22) IGMPv3

Header checksum

Multicast address 224.0.0.252

Info IGMPv3

224.0.0.252

Ethernet Src MAC 002354f2d5a4

Ethernet Dst MAC 01005e000016

15

Internet Protocol Src IP 192.168.168.66

Internet Protocol Dst IP 224.0.0.22

ICMP IGMPv3

Type (0x22) IGMPv3

Header checksum

Multicast address 224.0.0.252

UDP

IP IP 192.168.68.65

IP 239.255.1.1

MAC 0018f3e8f6b2

MAC 0001005e7f0101