ZyXEL ES-2024A User Guide - Page 158

Multicast Status

Page 158 highlights

Chapter 21 Multicast 21.1.3 IGMP Snooping The Switch can passively snoop on IGMP packets transferred between IP multicast routers/switches and IP multicast hosts to learn the IP multicast group membership. It checks IGMP packets passing through it, picks out the group registration information, and configures multicasting accordingly. IGMP snooping allows the Switch to learn multicast groups without you having to manually configure them. The Switch 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. IGMP snooping generates no additional network traffic, allowing you to significantly reduce multicast traffic passing through your Switch. 21.1.4 IGMP Snooping and VLANs The Switch can perform IGMP snooping on up to 16 VLANs. You can configure the Switch to automatically learn multicast group membership of any VLANs. The Switch then performs IGMP snooping on the first 16 VLANs that send IGMP packets. This is referred to as auto mode. Alternatively, you can specify the VLANs that IGMP snooping should be performed on. This is referred to as fixed mode. In fixed mode the Switch does not learn multicast group membership of any VLANs other than those explicitly added as an IGMP snooping VLAN. 21.2 Multicast Status Click Advanced Applications > Multicast to display the screen as shown. This screen shows the multicast group information. See Section 21.1 on page 157 for more information on multicasting. Figure 77 Advanced Application > Multicast The following table describes the labels in this screen. Table 43 Multicast Status LABEL DESCRIPTION Index This is the index number of the entry. VID This field displays the multicast VLAN ID. 158 ES-2024 Series User's Guide

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Chapter 21 Multicast
ES-2024 Series User’s Guide
158
21.1.3
IGMP Snooping
The Switch can passively snoop on IGMP packets transferred between IP multicast
routers/switches and IP multicast hosts to learn the IP multicast group
membership. It checks IGMP packets passing through it, picks out the group
registration information, and configures multicasting accordingly. IGMP snooping
allows the Switch to learn multicast groups without you having to manually
configure them.
The Switch 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. IGMP snooping generates no additional network
traffic, allowing you to significantly reduce multicast traffic passing through your
Switch.
21.1.4
IGMP Snooping and VLANs
The Switch can perform IGMP snooping on up to 16 VLANs. You can configure the
Switch to automatically learn multicast group membership of any VLANs. The
Switch then performs IGMP snooping on the first 16 VLANs that send IGMP
packets. This is referred to as auto
mode. Alternatively, you can specify the VLANs
that IGMP snooping should be performed on. This is referred to as fixed
mode. In
fixed mode the Switch does not learn multicast group membership of any VLANs
other than those explicitly added as an IGMP snooping VLAN.
21.2
Multicast Status
Click
Advanced Applications
>
Multicast
to display the screen as shown. This
screen shows the multicast group information. See
Section 21.1 on page 157
for
more information on multicasting.
Figure 77
Advanced Application > Multicast
The following table describes the labels in this screen.
Table 43
Multicast Status
LABEL
DESCRIPTION
Index
This is the index number of the entry.
VID
This field displays the multicast VLAN ID.