Planet Technology SGSW-4802 3.8 IGMP, 3.8.1 IGMP Management, 3.8.2 Definition on IGMP v1.0 and, NOTE, router, Step 1:, Step 2:, Step 3:, Step 4:, protocol, multicast, 1 s – 10 s

In Internet standard "dotted decimal" nota- tion, host group addresses range from 224.0.0.0 to 239.255.255.255. The address 224.0.0.0 is guaranteed not to be assigned to any group, and 224.0.0.1 is assigned to the permanent group of all IP hosts (in- cluding gateways). This is used to address all multicast hosts on the directly connected network. There is no multicast address (or any other IP address) for all hosts on the total Internet. The addresses of other well-known, permanent groups are to be published in "Assigned Numbers".

Figure 3-8: The IGMP Web Page

3.8.1 IGMP Management

To activate IGMP function,

Step 1: Select “enabled” in the IGMP state field.

Step 2: Click on the radio button to select the version for IGMP.

Step 3: Click the “Apply” button and save your current configuration.

3.8.2 Definition on IGMP v1.0 and v2.0 For IGMP v1.0,

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Host groups are identified by class D IP addresses, i.e., those with "1110" as their high-order four bits. Class D IP addresses, i.e., those with "1111" as their high-order four bits, are reserved for future addressing modes.

Host Group Addresses

Internet Group Management Protocol (IGMP) is an Internet protocol that provides a way for an Internet computer to report its multicast group membership to adjacent routers. It allows the man- agement switch to forward multicast traffic intelligently. The switch "snoops" the IGMP query and report messages and forwards traffic to only the ports that request the multicast traffic. This prevents the switch from broadcasting the traffic to all ports and possibly affecting network performance. The

membership of a host group is dynamic - hosts may join and leave groups at any time. There is no restriction on the location or number of members in a host group. A host may be a member of more than one group at a time. A host need not be a member of a group to send datagrams to it. The IGMP screen in Figure 3-8 appears.

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NOTE

3.8 IGMP

The screen is divided into two sections. Current Spanning Tree Root section displays the read-only Spanning Tree settings for the current root switch and the parameters this switch is to use when it becomes the root switch.

Key in the Forward Delay Time, Maximum Age and Hello Time. Click “Apply” button and save it if everything is OK.

Setup Procedures

Step 1: Select Spanning Tree state option, either to enable or disable it.

Step 2: Set Root Priority from 0 s – 65535 s, and Hello Time from 1 s – 10 s.

Step 3:

Step 4: