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3-15. IGMP Snooping
The function, IGMP Snooping, is used to establish the multicast groups to
forward the multicast packet to the member ports, and, in nature, avoids wasting the
bandwidth while IP multicast packets are running over the network. This is because
a switch that does not support IGMP or IGMP Snooping can not tell the multicast
packet from the broadcast packet, so it can only treat them all as the broadcast
packet. Without IGMP Snooping, the multicast packet forwarding function is plain
and nothing is different from broadcast packet.
A switch supported IGMP Snooping with the functions of query, report and
leave, a type of packet exchanged between IP Multicast Router/Switch and IP
Multicast Host, can update the information of the Multicast table when a member
(port) joins or leaves an IP Multicast Destination Address. With this function, once a
switch receives an IP multicast packet, it will forward the packet to the members
who joined in a specified IP multicast group before.
The packets will be discarded by the IGMP Snooping if the user transmits
multicast packets to the multicast group that had not been built up in advance.
3-15-1 Proxy
Function name:
IGMP Proxy Configuration
Function description:
IGMP proxy enables the switch to issue IGMP host messages on behalf of
hosts that the system discovered through standard IGMP interfaces. The
switch acts as a proxy for its hosts.
You enable IGMP proxy on the switch, which connects to a router closer to the
root of the tree. This interface is the upstream interface. The router on the
upstream interface should be running IGMP.
Fig. 3-162 IGMP Proxy
- L2 Plus Managed Switch 3
- Table of Contents 5
- Revision History 8
- Caution 9
- Electronic Emission Notices 9
- About this user’s manual 10
- 1. Introduction 11
- Key Features in the Device 12
- 1-2. Checklist 14
- 1-3. Features 14
- LED Color Function 17
- 2. Installation 19
- Fig. 2-2 21
- Table 2-3 28
- Ethernet LAN 29
- 2-1-5. IP Address Assignment 30
- 1 0000000 32
- 1 1111111 32
- Fig. 2-12 34
- 2-2. Typical Applications 35
- 3. Operation of 37
- Web-based Management 37
- Fig. 3-1 38
- Fig. 3-2 39
- 3-1-1. System Information 42
- Fig. 3-4 43
- 3-1-2. Account Configuration 44
- 3-1-3. Time Configuration 45
- Fig. 3-6 47
- 3-1-4. IP Configuration 48
- 3-1-5. Loop Detection 51
- 3-1-6. Management Policy 52
- Fig. 3-9 53
- Fig. 3-10 53
- 3-1-7. Virtual Stack 55
- Desc: 58
- 3-2-1. Port Configuration 60
- 3-2-2.Port Status 62
- Fig. 3-14 63
- 3-2-3. Simple Counter 65
- Auto-refresh: 66
- 3-2-4. Detail Counter 67
- “Clear” button 70
- 3-3. VLAN 71
- 3-3-2. Tag-based Group 72
- 3-3-3. Port-based Group 75
- Fig. 3-23 76
- 3-3-4. Ports 77
- Fig. 3-24 78
- 3-3-5. Management 79
- 3-4. MAC 80
- Fig. 3-26 81
- 3-4-2. Static Filter 82
- 3-4-3. Static Forward 83
- 3-4-4. MAC Alias 84
- 3-4-5. MAC Table 85
- 3-5. GVRP 86
- Fig. 3-31 88
- 3-5-2. Counter 89
- 3-5-3. Group 91
- 3-6-1. Ports 92
- Fig. 3-34 93
- 3-6-2. Qos Control List 94
- Fig. 3-42 97
- 3-6-3.Rate Limiters 100
- 3-6-4.Storm Control 102
- 3-6-5.Wizard 103
- Set up Port Policies Finish 105
- Fig. 3-51 106
- 3-7. SNMP Configuration 113
- 3-8. ACL 115
- Fig. 3-64 116
- 3-8-2.Rate Limiters 117
- 3-8-3.Access Control List 118
- Ingress Port 119
- Fig. 3-69 Frame Type 120
- Fig. 3-70 121
- Fig. 3-118 Rate Limiter 135
- Fig. 3-119 Port Copy 135
- 3-8-4.Wizard 147
- Set up Port Policies 149
- Fig. 3-138 153
- 3-9. IP MAC Binding 156
- 3-10. 802.1X Configuration 158
- MAC Enable 159
- Port Authorize 159
- Fig. 3-54 160
- Table 3-3 162
- 3-10-1.Server 163
- ForceUnauthorized: 165
- ForceAuthorized: 165
- 3-10-3.Status 167
- Fig. 3-145 802.1X Status 168
- 3-10-4. Statistics 169
- 3-11. Trunking Configuration 170
- 3-11-1.Port 172
- 173
- Fig.3-147 Trunk Port Setting 173
- 3-11-2 Aggregator View 174
- 3-11-3 ACP System Priority 175
- 3-12 STP Configuration 176
- Fig. 3-150 STP Status 177
- 3-12-2. Configuration 178
- 3-13-1 Status 183
- 3-13-2 Region Config 184
- Fig. 3-156 185
- Fig. 3-157 185
- Fig. 3-158 185
- Fig. 3-159 185
- Fig. 3-160 185
- Fig. 3-156 Edit MSTI / Vlan 186
- Fig. 3-157 Instance Config 187
- Fig. 3-158 Port Config 188
- Fig. 3-159 Instance Status 189
- Fig. 3-160 Port Status 191
- 3-14. Mirror 193
- 3-15. IGMP Snooping 195
- 3-15-2 Group Membership 197
- Fig.3-61 198
- 3-16-1 Events 199
- 3-17-1. DHCP Snooping State 201
- 3-17-2. DHCP Snooping Entry 202
- 3-17-3. DHCP Snooping Client 203
- 3-18. Configuration 204
- 3-18-1. Factory Defaults 205
- 3-18-2 . Save Start 205
- 3-18-3 . Save User 205
- 3-18-4 . Restore User 206
- 3-19. Config File 207
- 3-20. Diagnostics 208
- 3-20-2 .Ping 209
- 3-20-2 .VeriPHY 210
- 3-21 Maintenance 211
- 3-22 Logout 212
- 4. Operation of CLI 213
- Management 213
- LGB1005A-R2 214
- 4-2. Commands of CLI 215
- 802.1X 222
- account 227
- alarm 233
- autologout 238
- config-file 239
- firmware 239
- hostname 244
- ip_mac_binding 248
- loop-detection 249
- <<alias>> 251
- <<mac-table>> 253
- <<maintenance>> 254
- <<static-mac>> 257
- mirror 259
- per port restricted role 265
- policy 270
- <<ports>> 280
- <<qcl>> 281
- <<rate>> 283
- reboot 285
- <<disable>> 286
- <<enable>> 286
- <<set>> 286
- system 293
- traplog 294
- trunk 297
- 5. Maintenance 306
- Appendix A 307
- Technical Specifications 307
- Hardware Specifications 308
- Appendix B 311
- Null Modem Cable 311
- Specifications 311
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