TP-Link TL-SG2452 TL-SG2452 V1 User Guide - Page 130

“querier” and assumes responsibility for keeping track of group membership.

IGMP Snooping

Listening to IGMP Query and IGMP Report packets transferred between IP Multicast routers and

IP Multicast host groups to identify IP Multicast group members.

IGMP Query

On each subnetwork, one IGMP-capable device will act as the querier — that is, the device that

asks all hosts to report on the IP multicast groups they wish to join or to which they already belong.

The elected querier will be the device with the lowest IP address in the subnetwork.

IP Multicast Filtering

It is a

feature to allow or deny the Client to add the specified multicast group.

Multicast Switching

A process whereby the switch filters incoming multicast frames for services which no attached

host has registered, or forwards them to all ports contained within the designated multicast group.

Layer 2

Data Link layer in the ISO 7-Layer Data Communications Protocol. This is related directly to the

hardware interface for network devices and passes on traffic based on MAC addresses.

Link Aggregation

See Port Trunk.

Management Information Base (MIB)

An acronym for Management Information Base. It is a set of database objects that contains

information about a specific device.

MD5 Message-Digest Algorithm

An algorithm that is used to create digital signatures. It is intended for use with 32 bit machines

and is safer than the MD4 algorithm, which has been broken. MD5 is a one-way hash function,

meaning that it takes a message and converts it into a fixed string of digits, also called a message

digest.

Network Time Protocol (NTP)

NTP provides the mechanisms to synchronize time across the network. The time servers operate

in a hierarchical-master-slave configuration in order to synchronize local clocks within the subnet

and to national time standards via wire or radio.

Port Mirroring

A method whereby data on a target port is mirrored to a monitor port for troubleshooting with a

logic analyzer or RMON probe. This allows data on the target port to be studied unobstructively.

Port Trunk

Defines a network link aggregation and trunking method which specifies how to create a single

high-speed logical link that combines several lower-speed physical links.

Remote Authentication Dial-in User Service (RADIUS)

RADIUS is a logon authentication protocol that uses software running on a central server to

control access to RADIUS-compliant devices on the network.

123

Section	Page
Package Contents	8
Chapter 1 About this Guide	9
1.1 Intended Readers	9
1.2 Conventions	9
1.3 Overview of This Guide	9
Chapter 2 Introduction	12
2.1 Overview of the Switch	12
2.2 Main Features	12
2.3 Appearance Description	12
2.3.1 Front Panel	12
2.3.2 Rear Panel	13
Chapter 3 Login to the Switch	14
3.1 Login	14
3.2 Configuration	14
Chapter 4 System	16
4.1 System Info	16
4.1.1 System Summary	16
4.1.2 Device Description	17
4.1.3 System Time	18
4.1.4 Daylight Saving Time	19
4.1.5 System IP	20
4.2 User Management	21
4.2.1 User Table	21
4.2.2 User Config	21
4.3 System Tools	23
4.3.1 Config Restore	23
4.3.2 Config Backup	23
4.3.3 Firmware Upgrade	24
4.3.4 System Reboot	25
4.3.5 System Reset	25
4.4 Access Security	25
4.4.1 Access Control	25
Chapter 5 Switching	28
5.1 Port	28
5.1.1 Port Config	28
5.1.2 Port Mirror	29
5.1.3 Port Security	31
5.1.4 Port Isolation	33
5.2 LAG	33
5.2.1 LAG Table	34
5.2.2 Static LAG	35
5.3 Traffic Monitor	36
5.3.1 Traffic Summary	36
5.3.2 Traffic Statistics	38
5.4 MAC Address	39
5.4.1 Address Table	40
5.4.2 Static Address	41
5.4.3 Dynamic Address	42
5.4.4 Filtering Address	44
Chapter 6 VLAN	46
6.1 802.1Q VLAN	47
6.1.1 VLAN Config	49
6.1.2 Port Config	51
6.2 Application Example for 802.1Q VLAN	53
Chapter 7 Spanning Tree	55
7.1 STP Config	60
7.1.1 STP Config	60
7.1.2 STP Summary	62
7.2 Port Config	62
7.3 MSTP Instance	64
7.3.1 Region Config	64
7.3.2 Instance Config	65
7.3.3 Instance Port Config	66
7.4 STP Security	68
7.4.1 Port Protect	68
7.4.2 TC Protect	71
7.5 Application Example for STP Function	71
Chapter 8 Multicast	75
8.1 IGMP Snooping	77
8.1.1 Snooping Config	78
8.1.2 Port Config	79
8.1.3 VLAN Config	80
8.1.4 Multicast VLAN	82
8.2 Multicast IP	85
8.2.1 Multicast IP Table	86
8.2.2 Static Multicast IP	86
8.3 Multicast Filter	87
8.3.1 IP-Range	88
8.3.2 Port Filter	88
8.4 Packet Statistics	90
Chapter 9 QoS	92
9.1 DiffServ	95
9.1.1 Port Priority	95
9.1.2 Schedule Mode	96
9.1.3 802.1P Priority	97
9.1.4 DSCP Priority	97
9.2 Bandwidth Control	99
9.2.1 Rate Limit	99
9.2.2 Storm Control	100
Chapter 10 SNMP	102
10.1 SNMP Config	104
10.1.1 Global Config	104
10.1.2 SNMP View	105
10.1.3 SNMP Group	105
10.1.4 SNMP User	107
10.1.5 SNMP Community	109
10.2 Notification	111
10.3 RMON	112
10.3.1 History Control	113
10.3.2 Event Config	114
10.3.3 Alarm Config	114
Chapter 11 Maintenance	117
11.1 System Monitor	117
11.1.1 CPU Monitor	117
11.1.2 Memory Monitor	118
11.2 Log	118
11.2.1 Log Table	119
11.2.2 Local Log	120
11.2.3 Remote Log	120
11.2.4 Backup Log	121
11.3 Device Diagnostics	122
11.3.1 Cable Test	122
11.3.2 Loopback	123
11.4 Network Diagnostics	123
11.4.1 Ping	123
11.4.2 Tracert	124
Appendix A: Specifications	126
Appendix B: Configuring the PCs	127

TP-Link TL-SG2452 TL-SG2452 V1 User Guide - Page 130

Remote Authentication Dial-in User Service RADIUS, Management Information Base MIB

Page 130 highlights