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Chapter 55 IPv6
Figure 248 MLD Port Role Example
DSL
Proxy
Snooping
USP
DSP
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.
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Troubleshooting
