H3c-technologies H3C S3100V2 Series Switches Manual de usuario descargar pdf (Pagina 24)

The switch removes the port from the outgoing port list of the entry in the forwarding table for that

multicast group when the aging timer expires.

IGMP snooping proxying

The IGMP snooping proxying function on an edge device reduces the number of IGMP reports and leave

messages sent to its upstream device. The device configured with IGMP snooping proxying is called

“IGMP snooping proxy.” It is a host from the perspective of its upstream device.

NOTE:

Even though an IGMP snooping proxy is a host from the perspective of its upstream device, the IGMP

membership report suppression mechanism for hosts does not take effect on it.

Figure 12 Network diagram for IGMP snooping proxying

As shown in Figure 12, Switch A works as an IGMP snooping proxy. As a host from the perspective of the

querier Router A, Switch A represents its attached hosts to send membership reports and leave messages

to Router A.

Table 7 IGMP message processing on an IGMP snooping proxy

IGMP message Actions

General query

When receiving an IGMP general query, the proxy forwards it to all

ports but the receiving port. In addition, the proxy generates a report

according to the group memberships it maintains and sends the report

out all router ports.

Group-specific query

In response to the IGMP group-specific query for a certain multicast

group, the proxy sends the report to the group out all router ports if the

forwarding entry for the group still contains a member port.

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H3c-technologies H3C S3100V2 Series Switches Manual de usuario Pagina 24