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When receiving IGMP report message, the switch will send the report message via the router port

in the VLAN as well as analyze the message to get the address of the multicast group the host

applies for joining. The receiving port will be processed: if the receiving port is a new member port,

it will be added to the multicast address table with its member port time specified; if the receiving

port is already a member port, its member port time will be directly reset.

3. IGMP Leave Message

The host, running IGMPv1, does not send IGMP leave message when leaving a multicast group,

as a result, the switch cannot get the leave information of the host momentarily. However, after

leaving the multicast group, the host does not send IGMP report message any more, so the switch

will remove the port from the corresponding multicast address table when its member port time

times out. The host, running IGMPv2 or IGMPv3, sends IGMP leave message when leaving a

multicast group to inform the multicast router of its leaving.

When receiving IGMP leave message, the switch will forward IGMP group-specific-query message

to check if other members in the multicast group of the port need this multicast and reset the

member port time to the leave time. When the leave time times out, the switch will remove the port

from the corresponding multicast group. If no other member is in the group after the port is

removed, the switch will send IGMP leave message to the router and remove the whole multicast

group.



IGMP Snooping Fundamentals

1. Ports

Router Port:

Indicates the switch port directly connected to the multicast router.

Member Port:

Indicates a switch port connected to a multicast group member.

2. Timers

Router Port Time:

Within the time, if the switch does not receive IGMP query message from the

router port, it will consider this port is not a router port any more. The default value is 300 seconds.

Member Port Time:

Within the time, if the switch does not receive IGMP report message from the

member port, it will consider this port is not a member port any more. The default value is 260

seconds.

Leave Time:

Indicates the interval between the switch receiving a leave message from a host and

the switch removing the host from the multicast groups. The default value is 1 second.

The IGMP Snooping function can be implemented on

Snooping Config

,

Port Config

,

VLAN

Config

and

Multicast VLAN

pages.

8.1.1 Snooping Config

To configure the IGMP Snooping on the switch, please firstly configure IGMP global configuration

and related parameters on this page.

If the multicast address of the received multicast data is not in the multicast address table, the

switch will broadcast the data in the VLAN. When Unknown Multicast Discard feature is enabled,

the switch drops the received unknown multicast so as to save the bandwidth and enhance the

process efficiency of the system. Please configure this feature appropriate to your needs.

Section	Page
Package Contents	9
Chapter 1 About this Guide	10
1.1 Intended Readers	10
1.2 Conventions	10
1.3 Overview of This Guide	10
Chapter 2 Introduction	14
2.1 Overview of the Switch	14
2.2 Main Features	14
2.3 Appearance Description	15
2.3.1 Front Panel	15
2.3.2 Rear Panel	17
Chapter 3 Login to the Switch	18
3.1 Login	18
3.2 Configuration	19
Chapter 4 System	20
4.1 System Info	20
4.1.1 System Summary	20
4.1.2 Device Description	22
4.1.3 System Time	22
4.1.4 Daylight Saving Time	23
4.1.5 System IP	24
4.2 User Management	26
4.2.1 User Table	26
4.2.2 User Config	26
4.3 System Tools	27
4.3.1 Config Restore	27
4.3.2 Config Backup	28
4.3.3 Firmware Upgrade	28
4.3.4 System Reboot	29
4.3.5 System Reset	29
4.4 Access Security	30
4.4.1 Access Control	30
4.4.2 SSL Config	31
4.4.3 SSH Config	33
Chapter 5 Switching	40
5.1 Port	40
5.1.1 Port Config	40
5.1.2 Port Mirror	41
5.1.3 Port Security	43
5.1.4 Port Isolation	45
5.1.5 Loopback Detection	46
5.2 LAG	47
5.2.1 LAG Table	48
5.2.2 Static LAG	49
5.2.3 LACP Config	50
5.3 Traffic Monitor	52
5.3.1 Traffic Summary	52
5.3.2 Traffic Statistics	53
5.4 MAC Address	54
5.4.1 Address Table	55
5.4.2 Static Address	56
5.4.3 Dynamic Address	57
5.4.4 Filtering Address	59
5.5 DHCP Filtering	60
Chapter 6 VLAN	64
6.1 802.1Q VLAN	65
6.1.1 VLAN Config	66
6.2 Application Example for 802.1Q VLAN	68
Chapter 7 Spanning Tree	70
7.1 STP Config	75
7.1.1 STP Config	75
7.1.2 STP Summary	77
7.2 Port Config	77
7.3 MSTP Instance	79
7.3.1 Region Config	79
7.3.2 Instance Config	80
7.3.3 Instance Port Config	81
7.4 STP Security	83
7.4.1 Port Protect	83
7.4.2 TC Protect	86
7.5 Application Example for STP Function	86
Chapter 8 Multicast	90
8.1 IGMP Snooping	92
8.1.1 Snooping Config	93
8.1.2 Port Config	94
8.1.3 VLAN Config	95
8.1.4 Multicast VLAN	97
8.2 Multicast IP	100
8.2.1 Multicast IP Table	100
8.2.2 Static Multicast IP	101
8.3 Multicast Filter	102
8.3.1 IP-Range	102
8.3.2 Port Filter	103
8.4 Packet Statistics	104
Chapter 9 QoS	106
9.1 DiffServ	109
9.1.1 Port Priority	109
9.1.2 802.1P/CoS Mapping	110
9.1.3 DSCP Priority	111
9.1.4 Schedule Mode	112
9.2 Bandwidth Control	113
9.2.1 Rate Limit	113
9.2.2 Storm Control	114
9.3 Voice VLAN	116
9.3.1 Global Config	118
9.3.2 Port Config	118
9.3.3 OUI Config	119
Chapter 10 PoE	122
10.1 PoE Config	122
10.1.1 PoE Config	123
10.1.2 PoE Profile	124
10.2 PoE Time-Range	125
10.2.1 Time-Range Summary	125
10.2.2 PoE Time-Range Create	126
10.2.3 PoE Holiday Config	127
Chapter 11 ACL	128
11.1 ACL Config	128
11.1.1 ACL Summary	128
11.1.2 ACL Create	128
11.1.3 MAC ACL	129
11.1.4 Standard-IP ACL	130
11.1.5 Extend-IP ACL	130
11.1.6 Combined ACL	131
11.2 Policy Config	132
11.2.1 Policy Summary	132
11.2.2 Policy Create	133
11.2.3 Action Create	133
11.3 Policy Binding	134
11.3.1 Binding Table	134
11.3.2 Port Binding	135
11.3.3 VLAN Binding	135
11.4 Application Example for ACL	136
Chapter 12 SNMP	139
12.1 SNMP Config	141
12.1.1 Global Config	141
12.1.2 SNMP View	142
12.1.3 SNMP Group	143
12.1.4 SNMP User	144
12.1.5 SNMP Community	146
12.2 Notification	148
12.3 RMON	149
12.3.1 History Control	150
12.3.2 Event Config	151
12.3.3 Alarm Config	151
Chapter 13 LLDP	154
13.1 Basic Config	158
13.1.1 Global Config	158
13.1.2 Port Config	159
13.2 Device Info	160
13.2.1 Local Info	160
13.2.2 Neighbor Info	161
13.3 Device Statistics	161
13.4 LLDP-MED	163
13.4.1 Global Config	164
13.4.2 Port Config	165
13.4.3 Local Info	166
13.4.4 Neighbor Info	167
Chapter 14 Maintenance	169
14.1 System Monitor	169
14.1.1 CPU Monitor	169
14.1.2 Memory Monitor	170
14.2 Log	170
14.2.1 Log Table	171
14.2.2 Local Log	171
14.2.3 Remote Log	172
14.2.4 Backup Log	173
14.3 Device Diagnostics	174
14.3.1 Cable Test	174
14.4 Network Diagnostics	175
14.4.1 Ping	175
14.4.2 Tracert	176
Appendix A: Specifications	177
Appendix B: Configuring the PCs	178

TP-Link T1500-28PCT TL-SL2428P T1500-28PCT V1 User Guide - Page 93

Snooping Config, IGMP Snooping Fundamentals, Router Port, Member Port, Router Port Time

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