ZyXEL Communications IES-1248-51 Betriebsanweisung PDF herunterladen (Seite 172)

100

101

Chapter 20 IGMP

IES-1248-51V User’s Guide

172

The IES-1248-51V forwards multicast traffic destined for multicast groups (that it

has learned from IGMP snooping or that you have manually configured) to ports

that are members of that group. The IES-1248-51V discards multicast traffic

destined for multicast groups that it does not know. IGMP snooping generates no

additional network traffic, allowing you to significantly reduce multicast traffic

passing through your device.

20.2.2 IGMP Proxy

IGMP Proxy is a feature in the IES-1248-51V that allows for the reduction of

multicast traffic from an ‘upstream’ multicast server to ‘downstream’ host devices.

In IGMP proxy, an upstream interface is the port that is closer to the source (or

the multicast server) and is able to receive multicast traffic. A downstream

interface is a port that connects to a host (such as a computer).

The following figure shows a network example where A is the multicast server

while the computers labled 1, 2 and 3 are the receiving hosts. In the figure, A is

connected to the upstream interface (B) and 1, 2 and 3 are connected to the

downstream interface (C).

Note: In daisychain mode, Ethernet interface 1 is set as the upstream interface and

Ethernet interface 2 and the DSL ports are set as downstream interfaces.

Figure 78 IGMP Proxy Message Flow Example

The IES-1248-51V functions as a middle manager. The communication sequence

is:

1 Host 1 joins a multicast and the IES-1248-51V sends a message upstream letting

the multicast server know.

1 2 ... 167 168 169 170 171 172 173 174 175 176 177 ... 653 654

Kommentare zu diesen Handbüchern

Keine Kommentare

ZyXEL Communications IES-1248-51 Betriebsanweisung Seite 172

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Vernetzung ZyXEL Communications IES-1248-51