Igmp Snooping And Vlans; Mld Snooping-Proxy - ZyXEL Communications MES3500-24S User Manual

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 ZyXELZyxel-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.
Chapter 25 Multicast
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