ZyXEL Communications GS2220-10, Руководство пользователя

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Chapter 61 Switching
GS2220 Series User’s Guide
488
61.10 Multicast
Traditionally, IP packets are transmitted in one of either two ways
–
Unicast (1 sender to 1 recipient) or
Broadcast (1 sender to everybody on the network). Multicast delivers IP packets to just a group of hosts
on the network.
IGMP (Internet Group Management Protocol) is a network-layer protocol used to establish membership
in a multicast group
–
it is not used to carry user data. Refer to RFC 1112, RFC 2236 and RFC 3376 for
information on IGMP versions 1, 2 and 3 respectively.
This section shows you how to configure various multicast features.
61.10.1 What You Can Do
• Use the IPv4 Multicast Status screen ( Section 61.11 on page 488 ) to view multicast group information.
• Use the IGMP Snooping screen ( Section 61.12 on page 489 ) to enable IGMP snooping to forward
group multicast traffic only to ports that are members of that group.
• Use the IGMP Snooping VLAN screen ( Section 61.13 on page 493 ) to perform IGMP snooping on up to
16 VLANs.
• Use the IGMP Filtering Profile screen ( Section 61.14 on page 494 ) to specify a range of multicast
groups that clients connected to the Switch are able to join.
61.11 IPv4 Multicast Status
Use this screen to view the IPv4 multicast group information. Click Switching > Multicast from the
navigation panel to display the IPv4 Multicast Status screen as shown next.
Figure 369 Switching > Multicast > IPv4 Multicast Status
Apply Click Apply to save your changes to the Switch’s run-time memory. The Switch loses these
changes if it is turned off or loses power, so use the Save link on the top navigation panel to
save your changes to the non-volatile memory when you are done configuring.
Cancel Click Cancel to begin configuring this screen afresh.
Table 256 Switching > VLAN > VLAN Port Setting (continued)
LABEL DESCRIPTION