User's Manual
Table Of Contents
- 1. INTRODUCTION
- 2. INSTALLATION
- 3. SWITCH MANAGEMENT
- 4. WEB CONFIGURATION
- 4.1 System Information
- 4.2 Switch Management
- 4.2.1 Jumbo Frame
- 4.2.2 Interface
- 4.2.3 Statistics
- 4.2.4 VLAN
- 4.2.5 MAC Address
- 4.2.6 Port Mirror
- 4.2.7 Static Link Aggregation
- 4.2.8 LACP
- 4.2.9 Trunk Group Load Balance
- 4.2.10 Spanning Tree Protocol
- 4.2.11 IGMP Snooping
- 4.2.12 IGMP Filtering and Throttling
- 4.2.13 MLD Snooping
- 4.2.14 MVR For IPv4
- 4.2.14.1 Configure Global
- 4.2.14.2 Configure Domain
- 4.2.14.3 Show Configure Profile
- 4.2.14.4 Add Configure Profile
- 4.2.14.5 Show Associate Profile
- 4.2.14.6 Add Associate Profile
- 4.2.14.7 Configure Interface
- 4.2.14.8 Show Static Group Member
- 4.2.14.9 Add Static Group Member
- 4.2.14.10 Show Member
- 4.2.14.11 Show Query Statistics
- 4.2.14.12 Show VLAN Statistics
- 4.2.14.13 Show Port Statistics
- 4.2.14.14 Show Group Statistics
- 4.2.15 MVR For IPv6
- 4.2.15.1 Configure Global
- 4.2.15.2 Configure Domain
- 4.2.15.3 Show Configure Profile
- 4.2.15.4 Add Configure Profile
- 4.2.15.5 Show Associate Profile
- 4.2.15.6 Add Associate Profile
- 4.2.15.7 Configure Interface
- 4.2.15.8 Show Static Group Member
- 4.2.15.9 Add Static Group Member
- 4.2.15.10 Show Member
- 4.2.15.11 Show Query Statistics
- 4.2.15.12 Show VLAN Statistics
- 4.2.15.13 Show Port Statistics
- 4.2.15.14 Show Group Statistics
- 4.2.16 LLDP
- 4.2.17 ERPS
- 4.2.18 Loopback Detection
- 4.2.19 UDLD
- 4.2.20 Rate Limit
- 4.2.21 Storm Control
- 4.2.22 Stacking
- 4.2.23 Pepo
- 4.3 Route Management
- 4.4 ACL
- 4.5 CoS
- 4.6 Qu’s
- 4.7 Security
- 4.7.1 AAA
- 4.7.2 Web Authentication
- 4.7.3 802.1X
- 4.7.4 MAC Authentication
- 4.7.5 HTTPS
- 4.7.6 SSH
- 4.7.7 Port Security
- 4.7.8 DAI – Dynamic ARP Inspection
- 4.7.9 Login IP Management
- 4.7.10 DoS Protection
- 4.7.11 IPv4 DHCP Snooping
- 4.7.12 IPv6 DHCP Snooping
- 4.7.13 IPv4 Source Guard
- 4.7.14 IPv6 Source Guard
- 4.7.15 Application Filter
- 4.7.16 CPU Guard
- 4.8 Device Management
- 4.8.1 SNMP
- 4.8.2 RMON
- 4.8.3 Cluster
- 4.8.4 DNS
- 4.8.5 DHCP
- 4.8.6 OAM
- 4.8.7 CFM
- 4.8.7.1 Global Configuration
- 4.8.7.2 Interface Configuration
- 4.8.7.3 MD Management
- 4.8.7.4 MD Details
- 4.8.7.5 MA Management
- 4.8.7.6 MA Details
- 4.8.7.7 MEP Management
- 4.8.7.8 Remote MEP Management
- 4.8.7.9 Transmit Link Trace
- 4.8.7.10 Transmit Loopback
- 4.8.7.11 Transmit Delay Measure
- 4.8.7.12 Show Local MEP
- 4.8.7.13 Show Local MEP Details
- 4.8.7.14 Show Local MIP
- 4.8.7.15 Show Remote MEP
- 4.8.7.16 Show Remote MEP Details
- 4.8.7.17 Show Link Trace Cache
- 4.8.7.18 Show Fault Notification Generator
- 4.8.7.19 Show Continuity Check Error
- 4.8.8 Time Setting
- 4.8.9 Event Log
- 4.8.10 File Management
- 4.8.11 Ping
- 4.8.12 Trace Route
- 4.8.13 System Reboot
- 5. SWITCH OPERATION
- 6. TROUBLESHOOTING
- APPENDIX A: Networking Connection
- APPENDIX B : GLOSSARY
User’s Manual of SGS-5240 Series Managed Switch
103
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
message, and query messages that are specific to a given group.
The states a computer will go through to join or to leave a multicast group are shown below: