- Computers & electronics
- Networking
- Network switches
- Accton Technology
- CheetahSwitch Workgroup-3726M
- Product information
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Multicast Filtering
Multicast Filtering
Multicasting sends data to a group of nodes instead of a single destination. The simplest way to implement multicasting is to broadcast data to all nodes on the network. However, such an approach wastes a lot of bandwidth if the target group is small compared to overall the broadcast domain.
Since applications such as video conferencing and data sharing are more widely used today, efficient multicasting has become vital. A common approach is to use a group registration protocol that lets nodes join or leave multicast groups. A switch or router can then easily determine which ports contain group members and send data out to those ports only. This procedure is called multicast filtering.
The purpose of multicast filtering is to optimize a switched network’s performance, so multicast packets will only be forwarded to those ports containing multicast group hosts or multicast routers/switches instead of flooding to all ports in the subnet
(VLAN). This switch supports multicast filtering by passively monitoring IGMP Query and Report messages.
IGMP Snooping
A Layer 2 switch can passively snoop on IGMP Query and Report packets transferred between IP Multicast Routers/Switches and IP Multicast host groups to learn the IP Multicast group members. It simply monitors the IGMP packets passing through it, picks out the group registration information, and configures multicast filters accordingly. IGMP Snooping generates no additional network traffic, allowing you to significantly reduce the multicast traffic passing through your switch.
IGMP Protocol
The Internet Group Management Protocol (IGMP) runs between hosts and their immediately neighboring multicast router/switch. IGMP is a multicast host registration protocol that allows any host to inform its local router that it wants to receive transmissions addressed to a specific multicast group.
A router, or multicast-enabled switch, can periodically ask their hosts is they want to receive multicast traffic. If there is more than one router/switch on the LAN performing IP multicasting, one of these devices is elected “querier” and assumes the responsibility of querying the LAN for group members.
Based on the group membership information learned from IGMP, a router/switch can determine which (if any) multicast traffic needs to be forwarded to each of its ports.
At Layer 3, multicast routers use this information, along with a multicast routing protocol such as DVMRP, to support IP multicasting across the Internet.
Note that IGMP neither alters nor routes any IP multicast packets. A multicast router/ switch must be used to deliver IP multicast packets across different subnetworks.
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Table of contents
- 11 Configuration Options
- 11 Required Connections
- 11 Console Port (Out-of-Band) Connections
- 12 In-Band Connections
- 13 Login Screen
- 15 Console Configuration Navigation Keys and Buttons
- 16 Main Menu
- 18 System Information Menu
- 19 Displaying System Information
- 20 Displaying Switch Version Information
- 21 Management Setup Menu
- 22 Changing the Network Configuration
- 23 IP Configuration
- 24 IP Connectivity Test (Ping)
- 25 HTTP Configuration
- 26 Configuring the Serial Port
- 27 Assigning SNMP Parameters
- 28 Configuring Community Names
- 29 Configuring IP Trap Managers
- 30 Console Login Configuration
- 31 Downloading System Software
- 31 Using TFTP to Download Over the Network
- 32 Saving the System Configuration
- 33 Configuring the Switch
- 34 Configuring Port Parameters
- 35 Viewing the Current Port Configuration
- 36 Using the Spanning Tree Algorithm
- 36 Configuring Bridge STA
- 38 Configuring STA for Ports
- 39 Viewing the Current Spanning Tree Information
- 40 Displaying the Current Bridge STA
- 41 Displaying the Current STA for Ports
- 42 Using a Mirror Port for Analysis
- 43 Configuring Port Trunks
- 46 IGMP Multicast Filtering
- 46 Configuring IGMP
- 47 Configuring Broadcast Storm Control
- 48 Configuring Bridge MIB Extensions
- 49 Configuring Traffic Classes
- 50 Port Priority Configuration
- 51 802.1P Port Traffic Class Information
- 52 Configuring Virtual LANs
- 52 802.1Q VLAN Base Information
- 53 802.1Q VLAN Current Table Information
- 54 802.1Q VLAN Static Table Configuration
- 56 802.1Q VLAN Port Configuration
- 57 Port Security Configuration
- 58 Monitoring the Switch
- 59 Displaying Port Statistics
- 60 Displaying RMON Statistics
- 62 Displaying the Unicast Address Table
- 63 Displaying the IP Multicast Registration Table
- 64 Configuring Static Unicast Addresses
- 65 Resetting the System
- 65 Logging Off the System
- 67 Web-Based Configuration and Monitoring
- 68 Navigating the Web Browser Interface
- 68 Home Page
- 69 Configuration Options
- 69 Panel Display
- 70 Port State Display
- 71 Console Configuration
- 72 Main Menu
- 73 System Information
- 74 Switch Information
- 74 Main Board
- 74 Agent Module
- 75 Expansion Slot
- 76 IP Configuration
- 77 SNMP Configuration
- 77 SNMP Community
- 78 Trap Managers
- 78 Security Configuration
- 78 Change Password
- 79 Firmware Upgrade Options
- 79 Web Upload Management
- 79 TFTP Download Management
- 80 Configuration Save and Restore
- 80 Configuration Upload Management
- 80 Configuration Download Management
- 81 Address Table Configuration
- 82 Spanning Tree Algorithm (STA)
- 82 Spanning Tree Information
- 82 Spanning Tree
- 83 Ports
- 84 Spanning Tree Configuration
- 84 Switch
- 84 When the Switch Becomes Root
- 85 STA Port Configuration
- 86 Configuring Bridge MIB Extensions
- 86 Bridge Capability
- 87 Bridge Settings
- 88 Priority
- 88 Port Priority Configuration
- 89 Port Traffic Class Information
- 90 Configuring Virtual LANs
- 90 VLAN Basic Information
- 91 VLAN Current Table
- 92 VLAN Static List
- 93 VLAN Static Table
- 95 VLAN Static Membership by Port
- 96 VLAN Port Configuration
- 97 IGMP Multicast Filtering
- 97 Configuring IGMP
- 98 IP Multicast Registration Table
- 99 Port Menus
- 99 Port Information
- 100 Port Configuration
- 101 Expansion Port Information
- 102 Expansion Port Configuration
- 103 Port Broadcast Storm Protect Configuration
- 104 Port Security Configuration
- 105 Using a Port Mirror for Analysis
- 106 Port Trunk Configuration
- 108 Port Statistics
- 108 Etherlike Statistics
- 109 RMON Statistics
- 111 Layer 2 Switching
- 111 Spanning Tree Algorithm
- 112 Virtual LANs
- 113 Assigning Ports to VLANs
- 113 Port Overlapping
- 113 Automatic VLAN Registration (GVRP)
- 114 Forwarding Traffic with Unknown VLAN Tags
- 114 Forwarding Tagged/Untagged Frames
- 114 Connecting VLAN Groups
- 115 Multicast Filtering
- 115 IGMP Snooping
- 115 IGMP Protocol
- 116 Class-of-Service (CoS) Support
- 116 Port Trunks
- 116 SNMP Management Software
- 117 Remote Monitoring
- 119 Troubleshooting Chart
- 120 Upgrading Firmware via the Serial Port
- 123 Console Port Pin Assignments
- 123 DB-9 Port Pin Assignments
- 123 Console Port to 9-Pin DTE Port on PC
- 123 Console Port to 25-Pin DTE Port on PC