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166 VH-2402-L3 Management Guide 9033691-01
‘querier’. This router then keep track of the membership of
multicast groups that have active members on the network.
IGMP is used to determine whether the router should
forward multicast packets it receives to the subnetworks it is
attached to or not. A multicast router that has received a
multicast packet will check to determine if there is at least
one member of a multicast group that has requested to
receive multicast packets from this source. If there is one
member, the packet is forwarded. If there are no members,
the packet is dropped.
IGMP Versions 1 and 2
Users that want to receive multicast packets need to be able
to join and leave multicast groups. This is accomplished
using IGMP.
Figure 2-15. IGMP Message Format
The IGMP Type codes are shown below:
Type Meaning
0x11
Membership Query (if Group Address is 0.0.0.0)
0x11 Specific Group Membership Query (if Group Address is
Present)
0x16 Membership Report (version 2)
0x17 Leave a Group (version 2)
0x12 Membership Report (version 1)
Table 2-11. IGMP Type Codes
Multicast routers use IGMP to manage multicast group
memberships:
- VERTICAL HORIZON 1
- VH-2402-L3 1
- FAST ETHERNET SWITCH 1
- Interface 9
- Before You Start 9
- General Deployment Strategy 9
- VLAN Layout 10
- Defining Static Routes 11
- Connecting to the Switch 12
- Console Usage Conventions 12
- Creating User Accounts 15
- User Accounts Management 16
- Saving Changes 18
- Loading Factory Defaults 19
- Deleting a User Account 23
- Setting Up The Switch 24
- Remote Management Setup 28
- Setting Up Trap Receivers 29
- Configure Ports 31
- Serial Port Settings 32
- Switch Operation Mode 34
- Screen Hierarchy 38
- Layer 2 Switch Settings 41
- Advanced Setup 42
- Configuring VLANs 42
- Setting Up IP Interfaces 51
- Layer 2 Multicast Setup 55
- IGMP Snooping Settings 56
- Layer 3 Multicasting 61
- Setup IP Multicast 62
- IGMP Interface Configuration 64
- PIM-DM 69
- Port Mirroring 72
- Priority 74
- Layer 2 Filtering 75
- Forwarding 78
- Layer 2 Forwarding 78
- IP Forwarding 80
- Static ARP 81
- STP Group Confugration 84
- Switch Utilities 90
- Layer 2 Switch Utilities 90
- Updating Firmware 90
- Uploading a Settings File 92
- Uploading a History Log File 93
- Layer 3 Utilities 94
- BOOTP/DHCP Relay 94
- DNS Relay 97
- Network Monitoring 99
- Layer 2 Network Monitoring 99
- Port Utilization 100
- Port Error Statistics 101
- Port Packet Analysis Table 104
- MAC Address Forwarding Table 106
- GVRP Status Table 107
- Browse Router Port 108
- IGMP Snooping Table 109
- Layer 3 Network Monitoring 111
- IP Address Forwarding Table 112
- Routing Table 112
- ARP Table 113
- IGMP Group Table 115
- DVMRP Routing Table 116
- Load Factory Defaults 116
- Authentication 120
- Packet Forwarding 123
- MAC Address Aging Time 123
- Filtering 124
- Spanning Tree 125
- Bridge Protocol Data Units 127
- STP Port States 129
- Illustration of STP 132
- Port Trunking 134
- Port Trunking Group 135
- IEEE 802.1Q VLANs 137
- 802.1Q VLAN Tags 138
- Port VLAN ID 140
- Tagging and Untagging 141
- Ingress Filtering 142
- VLANs in Layer 2 Only Mode 143
- Layer 3-Based VLANs 143
- IP Addressing and Subnetting 144
- Definitions 144
- IP Addresses 144
- Address Classes 146
- Subnet Masking 147
- Setting up IP Interfaces 151
- Internet Protocols 153
- Protocol Layering 153
- Layer 1 156
- Layer 2 156
- Layer 3 156
- Layer 4 157
- Layer 7 157
- Packet Headers 159
- Ethernet 162
- UDP and ICMP 165
- The Domain Name System 166
- Domain Name Resolution 167
- DHCP Servers 168
- IP Routing 169
- Multicasting 171
- Multicast Groups 172
- IGMP Versions 1 and 2 174
- Multicast Routing Algorithms 176
- Flooding 176
- Multicast Spanning Trees 177
- Multicast Routing Protocols 179
- RIP Version 1 Message Format 183
- RIP 1 Message 184
- RIP 1 Route Interpretation 185
- RIP Version 2 Extensions 185
- RIP2 Message Format 185
- Full/Half Duplex Mismatch 188
- Unidirectional Link 189
- Packet Corruption 190
- Resource Errors 190
- Identifying a Data Loop 191
- Avoiding Trouble 191
- If it is a 196
- General (Cont’d) 198
- Physical and Environmental 199
- Performance 199
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