ProCurve 8200zl User's Guide download pdf (Page 43)

Multimedia Traffic Control with IP Multicast (IGMP)

How IGMP Operates

in the join request is determined by the requesting application running on the

IGMP client.) When a networking device with IGMP enabled receives the join

request for a specific group, it forwards any IP multicast traffic it receives for

that group through the port on which the join request was received. When the

client is ready to leave the multicast group, it sends a Leave Group message

to the network and ceases to be a group member. When the leave request is

detected, the appropriate IGMP device will cease transmitting traffic for the

designated multicast group through the port on which the leave request was

received (as long as there are no other current members of that group on the

affected port).

Thus, IGMP identifies members of a multicast group (within a subnet) and

allows IGMP-configured hosts (and routers) to join or leave multicast groups.

IGMP Data. To display data showing active group addresses, reports, que-

ries, querier access port, and active group address data (port, type, and

access), refer to the section titled “Internet Group Management Protocol

(IGMP) Status” in appendix B, “Monitoring and Analyzing Switch Operation”

of the Management and Configuration Guide for you switch.).

Operation With or Without IP Addressing

You can configure IGMP on VLANs that do not have IP addressing. The benefit

of IGMP without IP addressing is a reduction in the number of IP addresses

you have to use and configure. This can be significant in a network with a large

number of VLANs. The limitation on IGMP without IP addressing is that the

switch cannot become Querier on any VLANs for which it has no IP address—

so the network administrator must ensure that another IGMP device will act

as Querier. It is also advisable to have an additional IGMP device available as

a backup Querier. See the following table.

Table 2-1.Comparison of IGMP Operation With and Without IP Addressing

IGMP Function Available With IP Addressing

Configured on the VLAN

Available

Without IP

Addressing?

Operating Differences Without an IP Address

Forward multicast group traffic to any port on

the VLAN that has received a join request for

that multicast group.

Yes None

Forward join requests (reports) to the Querier. Yes None

Configure individual ports in the VLAN to Auto

(the default)/Blocked, or Forward.

Yes None

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