Chapter 25 Multicast
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25.1.4 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.
25.1.5 MLD Snooping-proxy
MLD snooping-proxy is a ZyXEL-proprietary feature. IPv6 MLD proxy allows only one upstream
interface on a switch, while MLD snooping-proxy supports more than one upstream port on a
switch. The upstream port in MLD snooping-proxy can report group changes to a connected
multicast router and forward MLD messages to other upstream ports. This helps especially when
you want to have a network that uses STP to provide backup links between switches and also
performs MLD snooping and proxy functions. MLD snooping-proxy, like MLD proxy, can minimize
MLD control messages and allow better network performance.
In MLD snooping-proxy, if one upstream port is learned via snooping, all other upstream ports on
the same device will be added to the same group. If one upstream port requests to leave a group,
all other upstream ports on the same device will also be removed from the group.
In the following MLD snooping-proxy example, all connected upstream ports (1 ~7) are treated as
one interface. The connection between ports 8 and 9 is blocked by STP to break the loop. If there is
one query from a router (
X
) or MLD Done or Report message from any upstream port, it will be
broadcast to all connected upstream ports.
1
2
3
4
5
6
7
8
9
X
Done
Query
Report
Содержание MGS3520 Series
Страница 18: ...18 PART I User s Guide ...
Страница 71: ...71 PART II Technical Reference ...
Страница 118: ...Chapter 9 VLAN MGS3520 Series User s Guide 118 Figure 58 Advanced Application VLAN Port Based VLAN Setup Port Isolation ...
Страница 189: ...Chapter 22 Policy Rule MGS3520 Series User s Guide 189 Figure 107 Policy Example EXAMPLE ...
Страница 408: ...Appendix B Common Services MGS3520 Series User s Guide 408 ...
Страница 420: ...Appendix D Legal Information MGS3520 Series User s Guide 420 Environmental Product Declaration ...