Manual
Table Of Contents
- 1. INTRODUTION
- 2. INSTALLATION
- 3. SWITCH MANAGEMENT
- 4. WEB CONFIGURATION
- 4.1 Main WEB PAGE
- 4.2 System
- 4.3 Simple Network Management Protocol
- 4.4 Port Management
- 4.5 Link Aggregation
- 4.6 VLAN
- 4.7 Rapid Spanning Tree Protocol
- 4.8 Quality of Service
- 4.9 Multicast
- 4.10 IEEE 802.1X Network Access Control
- 4.10.1 Understanding IEEE 802.1X Port-Based Authentication
- 4.10.2 802.1X System Configuration
- 4.10.3 802.1X and MAC-Based Authentication Port Configuration
- 4.10.4 802.1X Port Status
- 4.10.5 802.1X and MAC-Based Authentication Statistics
- 4.10.6 Windows Platform RADIUS Server Configuration
- 4.10.7 802.1X Client Configuration
- 4.11 Access Control Lists
- 4.12 Address Table
- 4.13 Port Security (To be Continued)
- 4.14 LLDP
- 4.15 Network Diagnastics
- 4.16 Stacking – SGSW-24040 / SGSW-24040R
- 4.17 Power over Ethernet (SGSW-24040P / SGSW-24040P4)
- 5. COMMAND LINE INTERFACE
- 6. Command Line Mode
- 6.1 System Command
- 6.2 Port Management Command
- 6.3 Link Aggregation Command
- 6.4 VLAN Configuration Command
- 6.5 Spanning Tree Protocol Command
- 6.6 Multicast Configuration Command
- 6.7 Quality of Service Command
- 6.8 802.1x Port Access Control Command
- 6.9 Access Control List Command
- 6.10 MAC Address Table Command
- 6.11 LLDP Command
- 6.12 Stack Management Command
- 6.13 Power over Ethernet Command
- 7. SWITCH OPERATION
- 8. POWER OVER ETHERNET OVERVIEW
- 9. TROUBLE SHOOTING
- APPENDEX A
- APPENDEX B : GLOSSARY
User’s Manual of WGSW-24040 Series
SGSW-24040/24240 Series
137
IGMP Versions 1 and 2
Multicast groups allow members to join or leave at any time. IGMP provides the method for members and multicast routers to
communicate when joining or leaving a multicast group.
IGMP version 1 is defined in RFC 1112. It has a fixed packet size and no optional data.
The format of an IGMP packet is shown below:
IGMP Message Format
Octets
0 8 16 31
Type Response Time
Checksum
Group Address (all zeros if this is a query)
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)
IGMP packets enable multicast routers to keep track of the membership of multicast groups, on their respective sub networks.
The following outlines what is communicated between a multicast router and a multicast group member using IGMP.
A host sends an IGMP “report” to join a group
A host will never send a report when it wants to leave a group (for version 1).
A host will send a “leave” report when it wants to leave a group (for version 2).
Multicast routers send IGMP queries (to the all-hosts group address: 224.0.0.1) periodically to see whether any group members
exist on their sub networks. If there is no response from a particular group, the router assumes that there are no group members
on the network.
The Time-to-Live (TTL) field of query messages is set to 1 so that the queries will not be forwarded to other sub networks.
IGMP version 2 introduces some enhancements such as a method to elect a multicast queried for each LAN, an explicit leave